I have a server (R815) with PERC H710. I have 4 disks and RAID-5 on them. The server have 2 empty disk slots.
After night I noticed 2 disks got predicted failure state - LEDs on disk flash yellow (not green) on them (2 of them). MegaCLI shows that 2 disks have high "Predictive Failure Count:" - some few thousands. Otger 2 disks are just fine. For any sake I've put 2 new disks in empty slots and set 2 hot spares. However I wonder if I could do more? Is there any safest way to secure data? I consider: A) reconfiguring raid-5 on 4 disks into raid-6 on 5 disks (and then replacing pre-failing disks one-by-one) - how with MegaCLI - is it good way? B) somehow (how???) copying data from one pre-failing disk onto hot spare and in final stage do switch of good for bad (pre-failing. If possible repeat it with second disk. In case of media failure data could be recovered from raid parity. No idea if possible? C) replacing disk by marking one of pre-failing disk as missing which should initiate rebuild on hot spare. This could be dangerous. However is there any way to judge which of pre-failing disks is in better state (so I could first replace and rebuild disk which is in worse condition)?? Any other suggestions? The VD is used (via lvm) by many Xen virtual machines so I hope it is possible to do it online. (I know: do/check backups, request long [for 1.5TB] maintenance window, build new raid from new disks and recover from backups - lots of time and work) Yours, GB
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