Aix 技巧 （关于SSA设备）

ezrah

替换一个SSA disk的步骤
SSA disks are hot swappable. When preparing AIX for the removal of an SSA
disk, do not use the rmdev command to remove the pdisk prior to physically
removing the disk from the enclosure. You will need the pdisk to do the
following steps. Use the rmdev command for the pdisk only when all steps are
completed.
>具体步骤如下：
1. Use the SSA Service aid to power the disk off prior to removal. This is
done by using the Set Service Mode and Identify facility. This will put the
disks on either side of the one you want to remove into string mode and
power off the disk to be removed.
2. When the replacement disk or blanking module is inserted, use the same
Service Aid to reset Service Mode. This will initialize the new disk and take
the other disks out of string mode.
3. At this point, you can now run the rmdev command to remove the pdisk
allocated to the disk you removed.
4. The disk change procedures will then tell you to run the cfgmgr command
to create a new pdisk for the replaced physical disk.
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>注意：
The cfgmgr command should not be executed on any system that is in a
HACMP cluster. To do so will seriously damage the configuration of the
machine, possibly resulting in the cluster going down.
General SSA setup rules（SSA设备的一般安装规则）
The following rules must be followed when connecting a 7133 or similar SSA
subsystem:
1, Each SSA loop must be connected to a valid pair of connectors on the
SSA adapter card. A1 and A2 form one loop, and B1 and B2 form another loop.
2, Only one pair of connectors of a SSA adapter can be connected in a
particular SSA loop. A1 or A2, with B1 or B2, can not be in the same SSA
loop.
3, A maximum of 48 disks can be connected in a SSA loop.
4, A maximum of three dummy disk drive modules can be connected next to
each other.
5, A maximum of two adapters can be in the same host per SSA loop.
6, Cables joining SSA nodes should not exceed 25 meters.
7, There is no addressing setup for any SSA device.
8, There is no termination since all connections should form a loop.


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