篇一:H3C AC进行Portal认证
一、 组网需求:
在BYOD组网方案下,我们主要通过iNode客户端、
HTTP网页、终端Mac地址以及DHCP的Option属性这四种方式获取终端的操作系统和厂商信息,实现终端识别以便完成相应的权限策略控制。其中DHCP的Option属性方式可普遍用户各种场景。由于部署DHCP服务器并安装Agent插件的方式比较繁琐,这里我们以普通Portal认证为例介绍一种通过无线控制器的DHCP-snooping功能获取记录终端的option 55(终端操作系统)和option 60(终端厂商)信息并通过Radius属性上报给iMC服务器的典型配置。
WX系列AC、Fit AP、交换机、便携机(安装有无线网卡)、iMC服务器及其他智能终端。
二、 组网图:
三、 配置步骤:
1、 AC版本要求
WX系列AC从B109D012合入该特性,因此只有这个版本号及其以后的版本支持DHCP-snooping功能获取记录终端的option 55(终端操作系统)和option 60(终端厂商)信息并通过Radius属性上报给iMC服务器。WX系列AC可通过下面的命令查看内部版本号:
<WX5540E>_display version
H3C Comware Platform Software
Comware Software, Version 5.20, Release 2607P18
Comware Platform Software Version COMWAREV500R002B109D022 H3C WX5540E Software Version V200R006B09D022
Copyright (c) 2004-2014 Hangzhou H3C Tech. Co., Ltd. All rights reserved.
Compiled Feb 25 2014 11:08:07, RELEASE SOFTWARE
H3C WX5540E uptime is 1 week, 4 days, 0 hour, 49 minutes 2、 AC侧配置及说明
#
version 5.20, Release 3120P17
#
sysname WX3024-AC
#
domain default enable system
#
telnet server enable
#
port-security enable
#
//配置portal server、ip、key、url以及server-type,注意这里server-type必须配置为imc
portal server imc ip 172.16.0.22 key cipher $c$3$6uB5v4kaCg1aSOJkOqX+== url http://172.16.0.22:8080/portal server-type imc
//配置portal free-rule放通AC内联口
portal free-rule 0 source interface GigabitEthernet1/0/1 destination any #
oap management-ip 192.168.0.101 slot 0
#
password-recovery enable
#
vlan 1
#
vlan 24
#
//配置radius策略,注意server-type必须选择extended模式,注意user-name-format及nas-ip的配置必须与iMC接入策略和接入服务里配置保持一致。
radius scheme imc
server-type extended
primary authentication 172.16.0.22
primary accounting 172.16.0.22
key authentication cipher $c$3$Myv0nhgPjC4vsMforZW3iCiW5KkP7Q== key accounting cipher $c$3$dCEXJGp71WPyrPK4hsPJd6sdTYf01A== user-name-format without-domain
nas-ip 172.16.0.202
#
//配置domain
domain imc
authentication portal radius-scheme imc
authorization portal radius-scheme imc
accounting portal radius-scheme imc
access-limit disable
state active
idle-cut disable
self-service-url disable
domain system
access-limit disable
state active
idle-cut disable
self-service-url disable
#
//配置AP注册dhcp pool
dhcp server ip-pool 1
network 192.168.0.0 mask 255.255.255.0
#
//配置终端业务dhcp pool
dhcp server ip-pool option55
network 192.168.24.0 mask 255.255.255.0
gateway-list 192.168.24.254
dns-list 8.8.8.8
#
user-group system
group-attribute allow-guest
#
local-user admin
password cipher $c$3$iMGlwEx7o4TNbMqd7OaOAwB5SWSzOrKE authorization-attribute level 3
service-type telnet
#
wlan rrm
dot11a mandatory-rate 6 12 24
dot11a supported-rate 9 18 36 48 54
dot11b mandatory-rate 1 2
dot11b supported-rate 5.5 11
dot11g mandatory-rate 1 2 5.5 11
dot11g supported-rate 6 9 12 18 24 36 48 54
#
//配置无线服务模板
wlan service-template 10 clear
ssid option55
bind WLAN-ESS 10
service-template enable
#
wlan ap-group default_group
ap ap1
ap ap2
#
interface NULL0
#
//与iMC互联ip及vlan接口
interface Vlan-interface1
ip address 172.16.0.202 255.255.255.0
#
//终端业务互联ip及vlan接口,接口下开启portal,注意portal domain及portal nas-ip配置需要与iMC服务器portal设备保持一致
interface Vlan-interface24
ip address 192.168.24.1 255.255.255.0
portal server imc method direct
portal domain imc
portal nas-ip 172.16.0.202
#
interface GigabitEthernet1/0/1
port link-type trunk
port trunk permit vlan all
#
//配置wlan-ess接口
interface WLAN-ESS10
port access vlan 24
#
wlan ap ap2 model WA2610H-GN id 2
serial-id 219801A0FH9136Q00287
radio 1
service-template 10
radio enable
#
//开启dhcp-snooping,使能dhcp-snooping记录用户的option 55和option 60信息功能
dhcp-snooping
dhcp-snooping binding record user-identity
#
//配置默认路由
ip route-static 0.0.0.0 0.0.0.0 192.168.24.254
#
snmp-agent
snmp-agent local-engineid 800063A203000FE2873066
snmp-agent community read public
snmp-agent community write private
snmp-agent sys-info version all
#
//使能dhcp
dhcp enable
#
user-interface con 0
user-interface vty 0 4
authentication-mode scheme
user privilege level 3
#
return
3、 iMC侧配置请参考KMS-21434《 WX系列AC与iMC配合实现无线Portal认证典型配置》,这里不再赘述。
4、 结果验证及抓包
1)AC上查看在线的客户端和portal在线用户信息:
<WX3024-AC>dis wlan client
Total Number of Clients : 2
Client Information
SSID: option55
------------------------------------------------------------------------------------------------- MAC Address User Name APID/RID IP Address VLAN
------------------------------------------------------------------------------------------------- 2477-0391-7720 -NA- 2/1192.168.24.224
28e1-4cb5-8249 -NA- 2/1192.168.24.324
------------------------------------------------------------------------------------------------- <WX3024-AC>dis portal user all
Index:12
State:ONLINE
SubState:NONE
ACL:NONE
Work-mode:stand-alone
MAC IP Vlan Interface
---------------------------------------------------------------------------------------------- 2477-0391-7720192.168.24.224 Vlan-interface24
Index:13
State:ONLINE
SubState:NONE
ACL:NONE
Work-mode:stand-alone
MAC IP Vlan Interface
---------------------------------------------------------------------------------------------- 28e1-4cb5-8249192.168.24.324 Vlan-interface24
Total 2 user(s) matched, 2 listed.
2)iMC上通过终端设备管理查看终端的厂商、类型以及操作系统等信息:
篇二:AIX系统管理员认证材料
目 录
第一章 认证概述 .................................................................................................................................. 11
1.1 PSERIES AIX 系统管理员(TEST 191) ..................................................................................... 11
1.1.1 认证前提建议 ...................................................................................................................... 11
1.1.2 认证考试注册 ...................................................................................................................... 11
1.1.3 认证考试目标 ...................................................................................................................... 11
1.2 认证培训课程 ............................................................................................................................. 13
1.3 光盘教学:IBM AIX ESSENTIALS .............................................................................................. 14
第二章 系统启动问题处理 .................................................................................................................. 15
2.1 本章中要用到的关键命令 ......................................................................................................... 15
2.2 引导过程 ..................................................................................................................................... 15
2.3 开机顺序、LED指示灯以及音频信号 ..................................................................................... 16
2.4 一些有用的命令 ......................................................................................................................... 17
2.4.1 使用alog命令 ..................................................................................................................... 17
2.4.2 使用cfgmgr命令 ................................................................................................................. 19
2.4.3 使用 last 命令 ...................................................................................................................... 21
2.4.4 使用bootlist命令 ................................................................................................................ 22
2.4.5 使用 uptime 命令 ................................................................................................................. 23
2.4.6使用 mpcfg 命令 ................................................................................................................. 23
2.4.7 使用 shutdown 命令 ............................................................................................................ 25
2.5 解决引导问题 ............................................................................................................................. 26
2.5.1 访问一个无法引导的系统 .................................................................................................. 26
2.5.2 安装介质的问题 .................................................................................................................. 29
2.5.3 常见的引导时 LED 错误代码和恢复操作......................................................................... 30
2.6 测验 ............................................................................................................................................. 31
2.6.1 答案 ...................................................................................................................................... 32
2.7 练习 ............................................................................................................................................. 32
第三章 硬件援助 ................................................................................................................................... 33
3.1 列出硬件设备 .............................................................................................................................. 33
3.1.1 使用 lsdev 命令..................................................................................................................... 33
3.1.2 使用 lspv 命令 ...................................................................................................................... 35
3.2 配置系统设备 .............................................................................................................................. 36
3.3 系统管理服务 .............................................................................................................................. 39
3.4 硬件设备兼容性 .......................................................................................................................... 39
3.4.1 设备配置数据库 ................................................................................................................... 40
3.5 使用 LSATTR 命令 ......................................................................................................................... 40
3.6 使用带 DEVICES 参数的SMIT ..................................................................................................... 42
3.7 系统错误日志 .............................................................................................................................. 42
3.7.1 使用 errdemon 命令 ............................................................................................................. 42
3.7.2 使用 errpt 命令 ..................................................................................................................... 43
3.7.3 使用 errlogger 命令 ............................................................................................................. 46
3.7.4 其他错误处理命令 ............................................................................................................... 47
3.8 诊断硬件问题 .............................................................................................................................. 47
3.9 系统日志 ...................................................................................................................................... 48
3.9.1 syslogd 配置文件 .................................................................................................................. 49
3.9.2 配置文件的格式 ................................................................................................................... 49
3.9.3 使用系统日志 ....................................................................................................................... 51
3.10 建立一个 ASCII 终端 ................................................................................................................ 52
3.11 测验 ............................................................................................................................................ 54
3.11.1 答案 ..................................................................................................................................... 55
3.12 练习 ............................................................................................................................................ 55
第四章 系统和软件安装 ....................................................................................................................... 56
4.1 基本操作系统(BASE OPERATING SYSTEM)安装 ..................................................................... 56
4.1.1 完全覆盖式安装 ................................................................................................................... 58
4.1.2 升级安装 ............................................................................................................................... 58
4.1.3 保留安装 ............................................................................................................................... 59
4.2 高级选项(ADVANCED OPTIONS)安装 ..................................................................................... 59
4.2.1 安装软件包集或桌面 ........................................................................................................... 59
4.2.2 激活可信计算环境(Trusted Computing Base,TCB) .................................................... 59
4.2.3 激活 64-bit 内核和 JFS2 ...................................................................................................... 60
4.3 配置助理(CONFIGURATION ASSISTANT) .................................................................................. 60
4.4 理解维护级别(MAINTENANCE LEVELS) .................................................................................. 61
4.5 软件封包 ...................................................................................................................................... 62
4.5.1 文件集(Filesets) .............................................................................................................. 63
4.5.2 软件包(Packages) ........................................................................................................... 63
4.5.3 注册的程序产品(Licensed Program Products) .............................................................. 63
4.5.4 软件束(Bundles) .............................................................................................................. 63
4.5.5 PTFs 和 APARs ..................................................................................................................... 63
4.6 安装可选软件和维护更新 .......................................................................................................... 64
4.6.1 installp 命令 .......................................................................................................................... 64
4.6.2 使用 SMIT 进行软件维护 .................................................................................................... 67
4.7 维护可选的软件(应用更新) .................................................................................................. 70
4.7.1 列出软件的维护级别 ........................................................................................................... 70
4.7.2 下载修复软件 ....................................................................................................................... 72
4.7.3 显示被安装的软件并更新到最新级别 ............................................................................... 73
4.8 在硬盘上创建安装映像 .............................................................................................................. 77
4.9 备用磁盘安装(ALTERNATE DISK INSTALLATION) .................................................................... 78
4.9.1 必要的文件集 ....................................................................................................................... 79
4.9.2 备用磁盘复制 rootvg............................................................................................................ 79
4.9.3 备用mksysb安装(Alternate mksysb install) ................................................................... 81
4.10 测验 ............................................................................................................................................ 82
4.10.1 答案 ..................................................................................................................................... 83
4.11 练习 ............................................................................................................................................ 84
第五章 对象数据管理器(OBJECT DATA MANAGER) .............................................................. 85
5.1 ODM 命令 .................................................................................................................................... 85
5.2 ODM数据库的对象类举例 ........................................................................................................ 86
5.3 测验题 .......................................................................................................................................... 86
5.3.1 答案 ....................................................................................................................................... 87
5.4 练习 .............................................................................................................................................. 87
第六章 存储管理,LVM和文件系统 ................................................................................................ 88
6.1 逻辑卷存储(LOGICAL VOLUME STORAGE)概念 ...................................................................... 88
6.2 逻辑卷管理器(LOGICAL VOLUME MANAGER) ....................................................................... 89
6.2.1 LVM 配置数据 ...................................................................................................................... 89
6.2.2 磁盘定额(Disk quorum) .................................................................................................. 90
6.2.3 磁盘镜像(Disk mirroring) ............................................................................................... 91
6.3 管理物理卷 .................................................................................................................................. 93
6.3.1 物理卷的配置 ....................................................................................................................... 93
6.3.2 使可用的磁盘成为物理卷 ................................................................................................... 94
6.3.3 修改物理卷特征 ................................................................................................................... 94
6.3.4 删除物理卷 ........................................................................................................................... 95
6.3.5 列出关于物理卷的信息 ....................................................................................................... 95
6.4 管理卷组 .................................................................................................................................... 101
6.4.1 增加一个卷组 ..................................................................................................................... 101
6.4.2 修改卷组特征 ..................................................................................................................... 102
6.4.3 导入(importing)和导出(exporting)一个卷组 .......................................................... 104
6.4.4 激活(varying on)和停止(varying off)卷组 ............................................................... 105
6.4.5 监控卷组 ............................................................................................................................. 107
6.4.6 重新组织(Reorganizing)卷组........................................................................................ 108
6.4.7 同步(Synchronizing)卷组 .............................................................................................. 109
6.5 管理逻辑卷 ................................................................................................................................ 109
6.5.1 增加一个逻辑卷 ................................................................................................................. 110
6.5.2 删除一个逻辑卷 ................................................................................................................. 112
6.5.3 减少逻辑卷的大小 ............................................................................................................. 113
6.5.4 增加逻辑卷的大小 ............................................................................................................. 113
6.5.5 拷贝一个逻辑卷 ................................................................................................................. 113
6.5.6 分离(splitting)逻辑卷的拷贝 ........................................................................................ 115
6.5.7 列出逻辑卷 ......................................................................................................................... 115
6.5.8 逻辑卷大小 ......................................................................................................................... 116
6.6 管理日志文件系统(JOURNALED FILE SYSTEMS) ................................................................... 117
6.6.1 日志文件系统的特征 ......................................................................................................... 117
6.6.2 创建一个文件系统 ............................................................................................................. 118
6.6.3 装载(mount)一个文件系统 ........................................................................................... 121
6.6.4 删除一个文件系统 ............................................................................................................. 124
6.6.5 增加文件系统大小 ............................................................................................................. 126
6.6.6 减少文件系统的大小 ......................................................................................................... 127
6.6.7 检查文件系统的一致性 ..................................................................................................... 128
6.6.8 初始化 JFS 日志设备 ......................................................................................................... 128
6.6.9 JFS日志设备的放置 .......................................................................................................... 129
6.6.10 允许大文件的文件系统 ................................................................................................... 129
6.7 文件系统问题排除 .................................................................................................................... 129
6.7.1 修复超级块错误 ................................................................................................................. 130
6.7.2 不能卸载文件系统 ............................................................................................................. 130
6.8 LVM 命令总结 ........................................................................................................................... 131
6.8.1 PV 命令 ............................................................................................................................... 131
6.8.2 VG 命令 .............................................................................................................................. 131
6.8.3 LV 命令 ............................................................................................................................... 131
6.8.4 文件系统命令 ..................................................................................................................... 132
6.9 测验 ............................................................................................................................................ 132
6.9.1 答案 ..................................................................................................................................... 134
6.10 练习 .......................................................................................................................................... 135
第七章 系统分页空间(SYSTEM PAGING SPACE) .................................................................. 136
7.1 分页空间概述 ............................................................................................................................ 136
7.1.1 对分页空间的考虑因素 ..................................................................................................... 136
7.2 管理分页空间 ............................................................................................................................ 138
7.2.1 显示分页空间特征 ............................................................................................................. 139
7.2.2 增加和激活一个分页空间 ................................................................................................. 139
7.2.3 修改分页空间的属性 ......................................................................................................... 140
7.2.4 删除一个分页空间(除hd6之外) ................................................................................. 142
7.2.5 管理缺省分页空间(hd6) ............................................................................................... 143
7.3 测验 ............................................................................................................................................ 146
7.3.1 答案 ..................................................................................................................................... 146
7.4 练习 ............................................................................................................................................ 147
第八章 系统备份、恢复和可用性 .................................................................................................... 148
8.1 MKSYSB 命令 .............................................................................................................................. 149
8.1.1 mksysb 磁带的数据布局 .................................................................................................... 150
8.1.2 排除不用备份的文件系统 ................................................................................................. 151
8.1.3 如何创建一个可引导的系统备份 ..................................................................................... 151
8.1.4 使用 mksysb 备份用户卷组 ............................................................................................... 154
8.2 备份用户信息 ............................................................................................................................ 154
8.2.1 备份单个卷组 ..................................................................................................................... 154
8.2.2 如何备份当前目录 ............................................................................................................. 155
8.2.3 增量备份 ............................................................................................................................. 156
8.3 从备份介质恢复信息 ................................................................................................................ 157
8.3.1 tctl 命令............................................................................................................................... 157
8.3.2 如何恢复一个文件 ............................................................................................................. 157
8.3.3 如何恢复一个目录 ............................................................................................................. 159
8.3.4 恢复的错误,不正确的块大小(incorrect block size) .................................................. 162
8.3.5 使用 rmfs 命令 .................................................................................................................... 162
8.4 复制你的系统 ............................................................................................................................ 163
8.5 复制一张软盘 ............................................................................................................................ 163
8.6 复制一盘磁带 ............................................................................................................................ 164
8.7 RMT的专用文件说明 ................................................................................................................. 164
8.8 高可用集群多路处理(HACMP) .......................................................................................... 165
8.9 测验 ............................................................................................................................................ 165
8.9.1 答案 ..................................................................................................................................... 166
8.10 练习 .......................................................................................................................................... 167
第九章 系统资源控制和管理 ............................................................................................................ 168
9.1 启动 SRC .................................................................................................................................... 168
9.1.1 telinit 命令 .......................................................................................................................... 169
9.2 重启 SRC .................................................................................................................................... 169
9.3 STARTSRC 命令............................................................................................................................ 169
9.4 SYSLOGD DAEMON....................................................................................................................... 170
9.4.1 启动 syslogd daemon .......................................................................................................... 170
9.4.2 syslog 配置文件 .................................................................................................................. 171
9.4.3 再循环(Recycling)和刷新(refreshing) syslogd daemon ........................................... 172
9.4.4 从多个系统收集 syslog 数据 ............................................................................................. 173
9.5 刷新一个 DAEMON ..................................................................................................................... 173
9.6 CRON DAEMON ............................................................................................................................ 173
9.6.1 Crontab 文件记录格式 ....................................................................................................... 174
9.6.2 允许对crontab 命令的访问 ............................................................................................... 174
9.6.3 内务处理(Housekeeping) .............................................................................................. 175
9.7 测验 ............................................................................................................................................ 177
9.7.1 答案 ..................................................................................................................................... 178
9.8 练习 ............................................................................................................................................ 178
第十章 网络管理 ................................................................................................................................ 179 10.1 引导期间的网络启动 .............................................................................................................. 179 10.2 停止和重启 TCP/IP DAEMONS ................................................................................................. 179 10.2.1 使用 /etc/tcp.clean 命令停止 TCP/IP daemons ............................................................... 179 10.2.2 重启 TCP/IP daemons ....................................................................................................... 180 10.3 系统引导时不启动 RC.TCPIP ................................................................................................... 180 10.4 INETD DAEMON .......................................................................................................................... 181 10.4.1 启动和刷新 inetd .............................................................................................................. 181 10.4.2 被 inetd 控制的子服务程序(Subservers) .................................................................... 181 10.4.3 /etc/services 文件 .............................................................................................................. 182 10.4.4 停止 inetd .......................................................................................................................... 183 10.5 PORTMAP DAEMON .................................................................................................................... 183 10.6 INTERNET 编址 ......................................................................................................................... 184 10.6.1 IP 地址格式 ...................................................................................................................... 184 10.6.2 二进制到十进制的转换 ................................................................................................... 184 10.6.3 Internet 地址分类 ............................................................................................................. 185 10.6.4 特殊的 Internet 地址 ........................................................................................................ 186 10.6.5 子网划分(subnetting) .................................................................................................. 187
篇三:数据中心机房的等级及其分级的依据
数据中心机房的等级及其分级的依据
数据中心(DataCenter)通常是指在一个物理空间内实现对数据信息的集中处理、存储、传输、交换、管理,一般含有计算机设备、服务器设备、网络设备、通讯设备、存储设备等关键设备。数据中心的基础设施(DataCenterInfrastructure)是指为确保数据中心的关键设备和装置能安全、稳定和可靠运行而设计配置的基础工程,也称机房(FacilitySiteEngineering),数据中心机房工程的建设不仅要为数据中心中的系统设备运营管理和数据信息安全提供保障环境,还要为工作人员创造健康适宜的工作环境。
数据中心机房的等级及其分级的依据
在国内标准《电子计算机机房设计规范》(GB50174-92)中主要从机房选址、建筑结构、机房环境、安全管理及对供电电源质量要求等方面对机房分级,可分为A(容错型)、B(冗余型)、C(基本型)三个级别。
在美国标准TIA-942《数据中心的通信基础设施标准》中主要是根据数据中心基础设施的“可用性(Availability)”、“稳定性(Stability)”和“安全性(Security)”分为四个等级:TierI,TierII,TierIII,TierIV。其中这四个等级可用性的划分是源于美国标准TheUptimeInstitute,Inc.的《IndustryStandardTierClassi?cationsDe?neSiteInfrastructurePerformance》(《采用分类等级的方式定义场地基础设施性能的工业标准》),在该标准中,美国TheUptimeInstitute依据工程需求与实践,提出了场地基础设施的分类等级的体系框架,针对数据中心的关键设备期望达到“五个九”即99.999%的系统应用可用性的需求,提出了要与之相匹配的机房场地基础设施(电源配电、暖通空调、以及其他的相关系统)的可用性等级指标。
在TIA-942标准中数据中心各等级的特性及要求
根据TIA-942标准,数据中心机房可分为四级:由“等级TierI”没有冗余部件组成的系统(可提供99.671%的可用性)到“等级TierIV”有冗余部件(能够故障容错)和实现不间断维修的系统(可提供99.995%的可用性)。根据该标准场地的可用性分类等级框架分成四个层次等级,下面将介绍该标准中每个等级的特性及其数据中心基础设施等级的类型、要求和相关特性:
(一)等级TierI――基本数据中心
“等级I”的数据中心对来自有计划和无计划的运营中断反映敏感(影响较大)。数据中心配有计算机电力分配和冷却,但是它可以或不一定有架高的活动地板,一台UPS或者一台发电机。在这些系统上的关键的负荷能达到N的100%。如果它确实有UPS或者发电机,他们是单个模块的系统并且有很多单个的故障点。一个年度内场地内基础设施被完全关闭停运,是基于进行预防性检修和修理的需要。紧急状态下可能需要频繁地关闭设施。场地内基础设施组成器件故障、操作错误,以及自然产生地失败将引起数据中心运营的中断。等级I由电力和冷却分配的一条单通路组成,没有多余的组成部分,提供99.671%的可用性。
(二)等级TierII――基础设施部件冗余
“等级II”的数据中心采用设备部件冗余要比“基本数据中心”有计划和无计划的运营中断反映稍微要少(影响较小)。场地内有架高的活动地板,一台UPS和发电机,动力的能力设计是N+1,全部有条单一的分配线路。关键的负荷能达到N的100%。关键线路的维修和场地内其他基础设施的维修维护将需要一次处理性关闭中断。等级II由电力和冷却分配的一条单通路组成,带有多余的组成部分,提供99.749%的可用性。
(三)等级TierIII――基础设施同时可维修
“等级III”的数据中心具有能够进行任何有计划的场地基础设施活动,而又不应使计算机硬件系统运行中断的能力。有计划的活动包括预防性和程序性的维修,修理和替换零部件,添加或调整部件的容量,部件和系统的测试。对使用冷冻水系统的大型场地来说,这表示两套独立的管路。要有足够的能力和分配,一定可提供在进行维修或者在其它管路上测试时,在一条管路上同时带负荷。无计划的活动,例如设备基础设施的零部件,在运行中或者自然的情况下发生故障,引起数据中心的运行中断。在一个系统上的关键的负荷不超过N的90%。当客户的业务需要得到正当合理的额外保护时,“等级III”的场地将被有计划地设计成可升级成“等级IV”的场地。等级III由多条有效的电力和冷却分配道路组成,但是只一条道路活跃,有多余的组成部分,并且同时是可维修的,提供的99.982%的可用性。
(四)等级TierIV――基础设施故障容错
“等级IV”的数据中心具有能够进行任何有计划的的活动且不会对关键的负荷造成中断的能力,且有提供场地基础设施容量及其能力。基础设施故障容错的功能性为场地基础设施的能力提供至少维持一种最坏的情况,无计划的故障或者事件将不影响关键的负荷。这需要同时活跃的分配道路,通常在S+S的双电源系统配置里。电力系统供应表示为每个有N+1冗余的两个单独的UPS系统。在一个系统上的涉及的关键的负荷不超过N的90%。“等级IV”需要全部计算机硬件有故障容错的双电源输入。严格的故障容错测验使数据中心具有维持无计划故障或者运行错误时,不发生计算机机房过程中断的能力。等级IV由多条有效的电力和冷却分配道路组成,有多余的组成部分,并且是故障容错,提供的99.995%的可用性。
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