[CentOS] best disk configuration

[Mag Gam]

Hey,

thanks for all the responses.

This is going to be DAS.

Thanks!
Naresh


On Mon, May 26, 2008 at 3:04 PM, Nikolay Ulyanitsky <lystor at lystor.org.ua>
wrote:

> On Mon, 2008-05-26 at 14:40 -0400, Mag Gam wrote:
> > I have 12 750GB drive appliance from HP. I was wondering what is the
> > best disk configuration? I suppose a large RAID5 would be bad since
> > rebuilding would take too long. What do you recommend?
>
> I prefer RAID10.
> You can create 1 RAID-10 device with 12 * 750 Gb / 2 = 4.5 Tb size.
>
> Also you can create 3 RAID-10 devices with 4 HDD per device. Each MD
> device's size will be 3 * 750 / 2 = 1.125 Tb.
>
>
> http://wiki.linuxquestions.org/wiki/RAID#RAID_10:_Striping_across_Mirror_sets:
> "RAID 10 provides better performance than simple RAID 1 along with the
> redundancy that simple RAID 0 lacks. It requires at least four drives to
> implement and provides usable space equal to S*N/2 where 'S' is the size
> of the smallest of the hard drives being used and 'N' is the number of
> disks in the array. So, if I form a RAID 10 of four 10 GB disks, the
> usable size of the array is 20 GB.
>
> RAID 0+1 and RAID 10 are very similar but, by most measures of both
> performance and redundancy, RAID 10 is considered to be preferable.
>
> A RAID 10 can withstand the failure of a single drive (or multiple
> drives, so long as they are NOT in the same mirror set)."
>
>
> --
> Nikolay Ulyanitsky <lystor at lystor.org.ua>
>
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