HP 2000sa HP StorageWorks 2312sa and 2324sa Modular Smart Array user guide (48 - Page 56

Controller failure in a single-controller configuration

Get HP 2000sa PDF manuals and user guides View all HP 2000sa manuals
Add to My Manuals
Save this manual to your list of manuals

Page 56 highlights

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? Answer No, the Cache LED status is off, and the controller doesn't boot. No, the Cache Status LED is off, and the controller boots. Yes, at a strobe 1:10 rate - 1 Hz, and the controller doesn't boot. Yes, at a strobe 1:10 rate - 1 Hz, and the controller boots. Yes, at a blink 1:1 rate - 1 Hz, and the controller doesn't boot. Yes, at a blink 1:1 rate - 1 Hz, and the controller boots. Actions If valid data is thought to be in Flash, see Transporting Cache; otherwise, replace the controller. The system is flushing data to disks. If the problem persists, replace the controller. See Transporting Cache. The system is flushing data to disks. If the problem persists, replace the controller. See Transporting Cache. The system is flushing data to disks. If the problem persists, replace the controller. 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 2312sa/2324sa G2 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. 56 Troubleshooting

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
  • 41
  • 42
  • 43
  • 44
  • 45
  • 46
  • 47
  • 48
  • 49
  • 50
  • 51
  • 52
  • 53
  • 54
  • 55
  • 56
  • 57
  • 58
  • 59
  • 60
  • 61
  • 62
  • 63
  • 64
  • 65
  • 66
  • 67
  • 68
  • 69
  • 70
  • 71
  • 72
  • 73
  • 74
  • 75
  • 76
56
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
2312sa/2324sa G2 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.