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SRN Problem Possible Causes
4252C Description: The Fast-Write Cache Option Card battery needs to be
exchanged for a new one.
Action: Exchange the FRU for a new FRU.
Possible FRUs:
Fast-Write Cache Option
Card battery (100%)
(“Removing the Fast-Write
Cache Option Card of an
Advanced SerialRAID
Adapter” on page 332).
4252D Description: Fast-write caching is suspended (stopped temporarily) for
one or more devices.
Action:
1. Type smitty devices and press Enter.
2. Select SSA Disks.
3. Select SSA Logical Disks.
4. Select Enable/Disable Fast-Write for Multiple Devices.
5. Note the numbers of each hdisk that is listed under “Fast-Write is
Suspended for these devices”.
6. If you do not know which RAID Manager (SSA adapter) is managing
the hdisk, give the following command from the command line:
ssaadap -l hdiskn
Where hdiskn is the hdisk number that you noted in step 5.
7. For each hdisk that you noted in step 5, give the following command
from the command line:
ssaraid -H -l RaidManager -n hdiskn -a fw_suspended=false
Where: RaidManager is the SSA adapter that is managing the
fast-write device, and hdiskn is the hdisk number that you noted in
step 5.
v An unexpected loss of power
has occurred on the using
system.
v The user has stopped an
uncouple operation.
42540 Description: Two-way fast-write for a disk drive is configured to operate
only when both caches are available. One cache, however, is now not
available.
Action:
1. If the using system that contains the partner adapter is switched off,
switch it on.
2. If the configuration has been changed, review the configuration rules,
and restore a valid configuration.
3. Run diagnostics on the partner adapter, and correct all problems. (The
partner adapter is the other adapter on the SSA loop that includes the
adapter that reported the problem.)
4. If, while the other adapter is not available, the user wants to use the
fast-write function on disk drives that are attached to this adapter,
change the state of the Bypass Cache In 1-Way Fast-Write Network
flag (see “Bypassing the Cache in a One-Way Fast-Write Network” on
page 217).
v Failure in another using
system.
v A user action has set
Bypass Cache when
1–way.
v Configuration change.
422 User’s Guide and Maintenance Information
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