[Beowulf] Large raid rebuild times

[Paul Van Allsburg]

james bardin wrote:
> Hello,
>
> Has anyone here seen any numbers, or tested themselves, the rebuild
> times for large raid arrays (raid 6 specifically)?
> I can't seem to find anything concrete to go by, and I haven't had to
> rebuild anything larger than a few TB. What happens when you loose a
> 2TB drive in a 20TB array for instance? Do any hardware raid solutions
> help. I don't think ZFS is an option right now, so I'm looking at
> Linux and/or hardware raid.
>
>
> Thanks
> -jim
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>   
Jim,

I have a new Infortrend a24s-g2130 with 24 x 1T drives. I setup a raid6 
with 2 spares and during the raid initialization a drive failed. The 
raid6 initialization took 20 hours and the rebuild took 16 hours.  I've 
since changed the rebuild priority from normal to high but have not had 
any more drives fail.

Cheers,
Paul



http://www.infortrend.com/main/2_product/es_a24s-g2130.asp

-- 
Paul Van Allsburg       
Scientific Computing Specialist
Natural Sciences Division, Hope College
35 E. 12th St.  Holland, Michigan 49423
616-395-7292    vanallsburg at hope.edu
http://www.hope.edu/academic/csm/