data gone from remaining drive?

[Troy]

Archived from groups: comp.sys.ibm.pc.hardware.storage (More info?)

I HAD a RAID 5 configuration with 3 drives. I lost one drive and while
I was obtaining a replacement in the mail the second drive went south!
Question:
Have I lost all my data or is it still somewhere on the remaining drive?

 

[Guest]

Archived from groups: comp.sys.ibm.pc.hardware.storage (More info?)

troy@helixservices.com wrote:

> I HAD a RAID 5 configuration with 3 drives. I lost one drive and while
> I was obtaining a replacement in the mail the second drive went south!
> Question:
> Have I lost all my data or is it still somewhere on the remaining drive?

You've lost it all. RAID5 manages parity in such a manner that it can
recover from a single drive failure, not from a double.

In the future you might want to consider using a hot-spare.

--
--John
Reply to jclarke at ae tee tee global dot net
(was jclarke at eye bee em dot net)

 

[Guest]

Archived from groups: comp.sys.ibm.pc.hardware.storage (More info?)

It's gone, but you do have backups, don't you....

http://www.taobackup.com/


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<troy@helixservices.com> kirjoitti viestissä
news:1106193944.539484.212490@z14g2000cwz.googlegroups.com...
> I HAD a RAID 5 configuration with 3 drives. I lost one drive and while
> I was obtaining a replacement in the mail the second drive went south!
> Question:
> Have I lost all my data or is it still somewhere on the remaining drive?
>

 

[Guest]

Archived from groups: comp.sys.ibm.pc.hardware.storage (More info?)

"Thomas Wendell" <tumppiw_NOSPAM@hotmail.com> wrote
> It's gone, but you do have backups, don't you....
>
> http://www.taobackup.com/
>

Heh, been a long time since that link was posted.

Make sure you read it all

--
Mike

 

[Guest]

Archived from groups: comp.sys.ibm.pc.hardware.storage (More info?)

Previously troy@helixservices.com <troy@helixservices.com> wrote:
> I HAD a RAID 5 configuration with 3 drives. I lost one drive and while
> I was obtaining a replacement in the mail the second drive went south!
> Question:
> Have I lost all my data or is it still somewhere on the remaining drive?

You have lost 2/3 of it. The rough sequence (order nad block-size
may vary) is

Disk 1 Disk 2 Disk 3
d1 d2 (d1+d2)
d2 (d3+d4) d4
(d5+d6) d5 d6

The parity blocks are pretty worthless if you do not have
n-2 other blocks in that line.

So if you original file was <d1 d2 d3 d4 d5 d6> you now have
left on, e.g. disk 1 <d1 - d2 - - - ->. May still mean
something, but probably not much.

Arno
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