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48 Troubleshooting
Controller failure in a single-controller configuration
Cache memory is flushed to CompactFlash in the case of a controller failure or power loss. During the write
to CompactFlash process only the components needed to write the cache to the CompactFlash are
powered by the super-capacitor. This process typically takes 60 seconds per 1 Gbyte of cache. After the
cache is copied to CompactFlash, the remaining power left in the super-capacitor is used to refresh the
cache memory. While the cache is being maintained by the super-capacitor, the Cache Status LED flashes
at a rate of 1/10 second off and 9/10 second on.
IMPORTANT: Transportable cache only applies to single-controller configurations. In dual controller
configurations, there is no need to transport a failed controller’s cache to a replacement controller because
the cache is duplicated between the controllers.
If the controller has failed or does not start, is the Cache Status LED on/blinking?
Transporting Cache
To preserve the existing data stored in the CompactFlash, you must transport the CompactFlash from the
failed controller to a replacement controller using a procedure outlined in the HP StorageWorks
2312fc/2324fc controller replacement instructions, shipped with the replacement controller. Failure to use
this procedure will result in the loss of data stored in the cache module.
CAUTION: Remove the controller only after the copy process is complete, which is indicated by the
Cache Status LED being off.
Answer Actions
No, the Cache LED status is off, and the
controller doesn’t boot.
If valid data is thought to be in Flash, see Transporting
Cache; otherwise, replace the controller.
No, the Cache Status LED is off, and the
controller boots.
The system is flushing data to disks. If the problem
persists, replace the controller.
Yes, at a strobe 1:10 rate - 1 Hz, and the
controller doesn’t boot.
See Transporting Cache.
Yes, at a strobe 1:10 rate - 1 Hz, and the
controller boots.
The system is flushing data to disks. If the problem
persists, replace the controller.
Yes, at a blink 1:1 rate - 1 Hz, and the
controller doesn’t boot.
See Transporting Cache.
Yes, at a blink 1:1 rate - 1 Hz, and the
controller boots.
The system is flushing data to disks. If the problem
persists, replace the controller.