[CentOS] RAID 5 setup?

Robert Heller heller at deepsoft.com
Thu Mar 25 23:10:02 UTC 2010


At Thu, 25 Mar 2010 22:27:56 +0100 CentOS mailing list <centos at centos.org> wrote:

> 
> 
> 
> 
> Am 25.03.2010 um 22:07 schrieb Boris Epstein:
> >>
> >>
> >
> > Robert,
> >
> > Why is the size a factor here? Why would this be OK with smaller
> > disks? How would you partition this instead?
> >
> > Thanks.
> >
> > Boris.
> 
> 
> 
> This has been discussed before.
> 
> The root of the problem lies in the fact that when a disk fails, you  
> have to read-out the data from the other disks to re-build the RAID.
> Reads from disks have a certain probability to contain an error.
> The larger the disk and the larger the array, the more probable it is  
> to encounter such an error while rebuilding the RAID (and if that  
> happens, you're RAID is just a piece of scrap-metal)

Or as was done recently at the Wendell Free Library, your disks become
raw materials for an after school art project... :-)

> 
> http://www.google.com/search?q=the+end+of+raid
> 
> RAID5 works OK-ish for a couple of 146GB SAS-disks.

More than a couple of disks for RAID5 -- at least 3 are needed for RAID5.

> 
> 
> 
> Rainer
> MIME-Version: 1.0
> 
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>                                                           

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Robert Heller             -- 978-544-6933
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