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What to do if I lost a RAID 10 drive?

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March 18, 2013 12:24:04 PM

I turned my computer on this morning and my Areca 1882ix-12 is beeping at me. In the BIOS it says my RAID 10 volume is degraded. When I check the status of the four drives in the volume, it says that slot one is "free" I'm assuming this means that drive went bad.

Can I continue operations without that drive? Can I pull that drive out to ship it back for warranty and still operate, or is my computer out of service until I get a new one?

Here's the really dumb question. With one drive pulled out, will my RAID 10 operate like a RAID 1? Like a RAID 0? Like a JBOD?

Please help, this problem is holding up a small business and I need to know what to do.

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March 18, 2013 12:49:26 PM

http://www.acronis.eu/resource/tips-tricks/2005/whats-r...
Raid 10 means you stripe the data across two of your drives and then mirror that onto the remaining two.
You will continue to run RAID10 but in a 'degraded state' i.e. not fully redundant

You can keep running with one drive degraded but should replace it as soon as you can. If you have another failure and it is the disk in the same pair as the one that is already dead then your data is toast.

Say you have 4 drives in Raid 10 Configuration, theoretically can I lose 2 drives before I die?

Since raid 10 is really mirroring plus striping, couldn't I lose 1 drive in each of the mirrors and continue to proceed in degraded mode?

It would depend on which two drive are lost.

Let's say you have these 4 drives, first set of A and B are striping, and the second set of A and B are mirroring the first set.

A + B

A + B

If you lost both A drives or both B drives, you won't able to bring the data back. If you lost 1 A and 1 B, you're fine.



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March 18, 2013 1:17:16 PM

Bottom line. Replace the drive as soon as you can. Make sure you have a good backup too.
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March 18, 2013 1:43:36 PM

hubbardt said:
http://www.acronis.eu/resource/tips-tricks/2005/whats-r...
Raid 10 means you stripe the data across two of your drives and then mirror that onto the remaining two.
You will continue to run RAID10 but in a 'degraded state' i.e. not fully redundant

You can keep running with one drive degraded but should replace it as soon as you can. If you have another failure and it is the disk in the same pair as the one that is already dead then your data is toast.

Say you have 4 drives in Raid 10 Configuration, theoretically can I lose 2 drives before I die?

Since raid 10 is really mirroring plus striping, couldn't I lose 1 drive in each of the mirrors and continue to proceed in degraded mode?

It would depend on which two drive are lost.

Let's say you have these 4 drives, first set of A and B are striping, and the second set of A and B are mirroring the first set.

A + B

A + B

If you lost both A drives or both B drives, you won't able to bring the data back. If you lost 1 A and 1 B, you're fine.





Ok, I don't want to risk it, I'll replace the drive before I continue. Just out of curiousity, is there a way to tell which drives are part of which setup, i.e. which two are part of the mirror, and which two are part of the stripe?
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