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ensure that the disk array is not in an unprotected state because of a disk failure. The system or
partition must be powered off normally before disks are moved.
v When physically removing disks that are members of a disk array, remove the disks from the auxiliary
storage pool (ASP) and then stop RAID on the disk array before removing the disks. This action avoids
loss of data and disk-array-related problems the next time that these disks are used. The system or
partition must be powered off normally before disks are physically removed.
v Always use the Device Concurrent Maintenance option to remove and replace a disk.
v If the load source disk is part of a disk array and the system fails to IPL because of a suspected disk
array problem, IPL the system or partition using D-IPL media (CD/DVD or SAVESYS media). Error
Log Analysis, and other tools are available on the Dedicated Service Tools menu to help determine and
resolve the problem with the disk array.
v Do not attempt to correct problems by swapping controllers and disks unless you are directed to do so
by the service procedures. Use Error Log Analysis to determine what actions to perform, and when
appropriate, follow the appropriate Isolation Procedures for problem determination. If multiple errors
occur at approximately the same time, look at them as a whole to determine if there is a common
cause.
v Do not confuse the cache directory card, which is a small rectangular card with round, button-shaped
batteries, for a removable cache card. The nonvolatile write cache memory is integrated into the
controller. The write cache memory itself is battery-backed by the large, rechargeable cache battery
pack. The cache directory card contains only a secondary copy of the write cache directory and no
cache data. Do not remove this card except under specific recovery cases as described in the Isolation
Procedures.
v Do not unplug or exchange a cache battery pack without following the procedures as outlined in this
section or in the Isolation Procedures. Failure to follow these procedures might result in data loss.
Rechargeable battery maintenance
Rechargeable battery maintenance tasks include displaying rechargeable battery information, forcing a
rechargeable battery error, and replacing the rechargeable cache battery pack.
Displaying rechargeable battery information
Use this procedure to view information about the controller rechargeable battery using the Hardware
Service Manager in the IBM
1. Sign on to the system with at least service level authority.
2. On the command line, type strsst. Press Enter.
3. On the System Service Tools (SST) Sign On display, type your service tools user ID and service tools
password. Press Enter.
4. On the System Service Tools (SST) display, select Start a Service Tool. Press Enter.
a. On the Start a Service Tool display, select Hardware Service Manager. Press Enter.
b. On the Hardware Service Manager display, select Work with resources containing cache battery
packs. Press Enter.
c. Select Display battery information.
32
SAS RAID controllers for IBM i
®
i operating system.
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