[nmglug] raid 10 vs 5

[Andres Paglayan]

On Wed, 2009-09-09 at 10:50 -0600, Gary Sandine wrote:

> Hi Andres,
> 
> On Wed, Sep 09, 2009 at 04:13:51PM +0000, Andres Paglayan wrote:
> >    quick question,
> > 
> >    If you have 4 x 1 TB disks, and they will be used for general purpose, (ie
> >    db and file storage)
> > 
> >    how would you arrange them?
> > 
> >    raid 5 with one hot-spare?
> >    or raid 1+0 (raid 10) stripping and mirroring?
> > 
> >    Both will provide 2 TB of available space,
> >    will the raid 10 be faster I/O?
> 
> I would probably make a RAID 6 array because I think that should
> always survive a double disk failure.  RAID 5 with a hot spare could
> fail if a second disk fails while the hot spare is being included
> (the rebuild can take a while for a 2 TB array), and RAID 10 could
> fail if one of the mirrors loses its second disk before a RAID 1
> component finishes mirroring onto a new disk.
> 
> I have only done RAID 6 with hardware RAID cards though (by Areca
> and 3ware).  I think the Linux kernel software RAID driver supports
> RAID 6 now.
> 

seems it does,
but I wonder about the write speed in this case,
it seems the same as raid 5,
but love the two disk failure and still up feature,



> Regards,
> Gary
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-------------------------------
Andres Paglayan
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(505) 629-4344
m:
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f:
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andres at paglayan.com
--------------------------------


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