IBM SAS RAID controllers, Manual

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Power-on time (days)
Indicates the raw power-on time, in units of days, of the rechargeable cache battery pack.
Adjusted power-on time (days)
Indicates the adjusted (prorated) power-on time, in units of days, of the rechargeable cache
battery pack.
Note: Some rechargeable cache battery packs are negatively affected by higher temperatures and
thus are prorated based on the amount of time that they spend at various ambient temperatures.
Estimated time to warning (days)
Estimated time, in units of days, until a message is issued indicating that the replacement of the
rechargeable cache battery pack must be scheduled.
Estimated time to error (days)
Estimated time, in units of days, until an error is reported indicating that the rechargeable cache
battery pack must be replaced.
Concurrently maintainable battery pack
Indicates if the rechargeable cache battery pack can be replaced while the controller continues to
operate.
Battery pack can be safely replaced
Indicates if the controller's write cache has been disabled and the rechargeable cache battery pack
can be safely replaced.
Error state
The cache battery pack must be in an error state before you replace it.
To prevent possible data loss, the cache battery pack must be in an error state before replacing it. This
ensures that all cache data is written to disk before battery replacement. Forcing the battery error results
in the following:
v
The system logs an error.
v Data caching becomes disabled on the selected controller.
v
System performance could become significantly degraded until the cache battery pack is replaced and
charging of the new battery pack has completed. The new battery pack may take several hours to
charge.
v
The battery pack can be safely replaced field on the controller rechargeable battery information screen
indicates Yes.
v
Cache data present LED stops flashing. See the feature descriptions and the figures in the Replacing a
battery pack section to determine if your adapter has a cache data present LED and the location of the
LED.
This error state requires replacement of the cache battery. Ensure that you have the correct type and
quantity of cache battery packs to do the replacement. To resume normal operations, replace the cache
battery pack.
The cache battery pack for the 572F storage I/O adapter and the 575C auxiliary cache adapter is
contained in a single battery field replacement unit (FRU) that is physically located on the 575C auxiliary
cache adapter. The functions of forcing a battery pack error and starting the adapter cache on either
adapter in the card set results in the same function automatically being performed on the other adapter
in the card set.
Forcing a rechargeable battery error
Use this procedure to place the controller's rechargeable battery into an error state using the Hardware
Service Manager in the IBM i operating system.
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SAS RAID controllers for IBM i