ess800的3种停机方式的疑惑，请老手帮助
看了ess800的3本service中发现3种关于ess800的停机方式，请老手帮助解释一下
第一种：直接关电
1. Instruct the system operator to vary all of the devices in the subsystem offline.
2. Inform the customer that the complete storage facility subsystem will be
unavailable.
3. Locate the subsystem operator panel on the front of the 2105 Model E10/E20
for the subsystem you are powering off.
4. Set the Local Power switch to Off (down).
5. Wait for the Power Complete indicators for Line Cords 1 and 2 to go off.
第二种：
Repair Menu
  Alternate Cluster Repair
    Quiesce the Alternate Cluste
    Power Off the Alternate cluster
第三种：
Quiesce the cluster bay you are servicing by selecting the following options from the Main
Service Menu, see “Utility Menu” on page 67:
Utility Menu
Resource Management Menu
Quiesce a Resource
Quiesce the cluster bay you are servicing.
Power Off the cluster bay you are servicing by selecting the following options from the Main
Service Menu:
Utility Menu
Cluster Bay Power Off/On
Select Power Off Cluster Bay 1 or 2

3种方式的区别是什么？一般采用哪种方式下电
谢谢

区别你自己不都写了么？

哈哈，区别就是停一部分（第二种）还是全停（第一、三种），全停又有先停io（第三种），再（直接）关电源（第一种）

第一种是主机下电时做的操作
第二种是维护其中一台cluster时做的操作，感觉Quiesce the Alternate Cluste这一步是做cluster的切换，有点象hacmp中的take over
第三种是针对某一台cluster的下电动作，感觉Quiesce a Resource是做cluster资源的停止，有点象hacmp中的graceful
不知道我理解的对不对，请指教。
谢谢

ding