[lug] RAID 5 Question

steve at badcheese.com steve at badcheese.com
Fri May 25 13:37:25 MDT 2007

If the RAID5 was layed-out like:

RAW RAW RAW PARITY, then you can lose one drive.
RAW RAW PARITY HOTSWAP, then you can lose two drives.

Most people don't use a hot-swap drive, so I'm guessing your setup is like 
the first option, so the answer to your question is yes.  If you lose a 
second drive there will be issuess recovering the array - you can kiss it 
goodbye.  1/3 of your data will be missing and there's no way to recover 
from that.

- Steve

On Fri, 25 May 2007, paul nowosielski wrote:

> Date: Fri, 25 May 2007 15:36:51 +0700
> From: paul nowosielski <paul at celebrityaccess.com>
> Reply-To: "Boulder (Colorado) Linux Users Group -- General Mailing List"
>     <lug at lug.boulder.co.us>
> To: "Boulder (Colorado) Linux Users Group -- General Mailing List"
>     <lug at lug.boulder.co.us>
> Subject: [lug] RAID 5 Question
> Dear All,
> I just have a question regarding RAID 5.
> I'm running software RAID 5 on a server. The RAID array has 4 drives. 1 drive 
> has failed.
> If I loose a second drive, so there would be 2 active drives, would there be 
> any issues recovering the array or data by replacing the 1 or both of the 
> failed drives
> and rebuilding the array?
> Thank you,
> -Paul
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EMAIL: (h) steve at badcheese.com  WEB: http://badcheese.com/~steve

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