How long to re-enable Logical drive on HP ProLiant

Adam_Li
Adam_Li used Ask the Experts™
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I have a server With 2 defected disks and Logical drive error. I have swaped the disks and only option is to re-enable Logical volume.
I did so and now the Icons on the server tower is spinning becaus things rebuilds. But, how long will it take? I dont have a GUI to view status. I closed til HP Array software and only option is to reboot or shut Down. I problably shouldnt do that until array is rebuild.
It is 7 disks  à 600GB sff 10K in raid 5.
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Senior Engineer
Commented:
RAID 5 array only allows for recovery in the event that just one disk at a time fails.

If two disks in a RAID5 array fail at the exact same time then even a hot spare won't help, because a hot spare replaces one of the failed disks and rebuilds the array without any intervention, and a rebuild isn't possible if more than one disk fails.

For now, I am sorry to say that your options for recovering this data are going to involve restoring a backup.

RAID 5 gives fault tolerance, but it's a compromise option - you have N+1 resilience, but if you have big drives you have a large window where a second fault can occur. RAID-6 gives N+2 fault tolerance, which is generally considered good (triple failure odds are a lot lower).

For drives larger than 1TB, you should use something more fault tolerant than RAID5.  In your case you're looking at around 3.6TB.

The drive may rebuild, but I'm afraid your data is gone on that drive and your only option is to restore from backup.

Author

Commented:
yes but the logical drive has to be rebuilt before i can recover from backup. I just Wonder how long it usuallt take. its 9 pm here now and i have waited 2 hours alreade. I Wonder if i should og to bed or do you think its will be ready soon?
All leds on bays as spinning in circles.
Scott CSenior Engineer

Commented:
Since you know you're going to need to recover from backup, just stop the process, re-create the array from scratch and do your restore.

With your drive size you could be looking at DAYS before it's done.

We had a server at a customer site do basically the same thing.  We got new drives, flattened the drive and started over from scratch, restored the data and was done faster than if we had let the drive rebuild on its own.

Author

Commented:
I'll give it a shot. maybe we're Lucky. Thanks.
Scott CSenior Engineer

Commented:
Only viable solution provided.

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