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Failed disk in Raid

By dennisbv ·
I have a server that is a raid 5 with five disks and one of them has a yellow light and when I went into the Raid Bios it lists the raid as degraded. It is on a AMI MeagaRaid Express Plus RAID Controler. And because of the servers age I may not be able to get
a new replacement HD for it. I have not done a lot with raid configurations so my question is this can I rebuild the Raid without the failed HD with out loosing the Data? If so How.

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by cmiller5400 In reply to Failed disk in Raid

How is the RAID5 set up? Does it have a hot spare? If yes, it should have already rebuilt the array on the spare drive. If not, it could be a sticky situation. A RAID5 array can tolerate only one disk failure. If you replace the disk, there should be an option to rebuild the array in the RAID controllers BIOS, if it does not happen automatically. If you can get the server up as is, do a FULL backup of ALL the data before messing around with the controller/disks. RAID5 can be very tempermental when not in a good condition. Backup, Backup, and Backup.

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by curlergirl In reply to Failed disk in Raid

The replacement drive does not have to be identical to the other four drives. I know that many RAID configurations recommend that all the disks be identical, but it is not absolutely necessary. As long as the replacement drive is at least as large or larger than the original one, it should work. A few years ago, I had the same situation with an array that had 5 9GB disks. No 9GB disks to be had, so I replaced the failed one with an 18GB disk. Worked fine - I did not have full use of the space on the 18GB disk, but that did not matter as it allowed me to rebuild the array successfully without losing data.

So, I recommend you get any disk you can and rebuild the array that way.

Hope this helps!

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by pierrejamme In reply to Failed disk in Raid

I agree with answers one and two and would like to add if you try replacing the hard drive find one that is the same speed, for example 10k on both. And as # 2 said if you currently have 18GB for example and add a 36Gb it will be used as an 18GB.

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by zaferus In reply to Failed disk in Raid

Backup?!

Is your data been recently backed up? If not can you move it/copy it to a temporary location while you get the array repaired? Like mentioned 2 disks down in the array and it's toast.

I have seen times when multiple disks fail within a very short period of time of each other - don't delay!

If you have the budget and your data is growing maybe it's a good excuse to upgrade the array, just a thought. Also make sure you know if the drives are hot swappable or not before replacing.

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by dennisbv In reply to Failed disk in Raid

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