Hey,<br><br>thanks for all the responses.<br><br>This is going to be DAS.<br><br>Thanks!<br>Naresh<br><br><br><div class="gmail_quote">On Mon, May 26, 2008 at 3:04 PM, Nikolay Ulyanitsky <<a href="mailto:lystor@lystor.org.ua">lystor@lystor.org.ua</a>> wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><div><div></div><div class="Wj3C7c">On Mon, 2008-05-26 at 14:40 -0400, Mag Gam wrote:<br>
> I have 12 750GB drive appliance from HP. I was wondering what is the<br>
> best disk configuration? I suppose a large RAID5 would be bad since<br>
> rebuilding would take too long. What do you recommend?<br>
<br>
</div></div>I prefer RAID10.<br>
You can create 1 RAID-10 device with 12 * 750 Gb / 2 = 4.5 Tb size.<br>
<br>
Also you can create 3 RAID-10 devices with 4 HDD per device. Each MD<br>
device's size will be 3 * 750 / 2 = 1.125 Tb.<br>
<br>
<a href="http://wiki.linuxquestions.org/wiki/RAID#RAID_10:_Striping_across_Mirror_sets" target="_blank">http://wiki.linuxquestions.org/wiki/RAID#RAID_10:_Striping_across_Mirror_sets</a> :<br>
"RAID 10 provides better performance than simple RAID 1 along with the<br>
redundancy that simple RAID 0 lacks. It requires at least four drives to<br>
implement and provides usable space equal to S*N/2 where 'S' is the size<br>
of the smallest of the hard drives being used and 'N' is the number of<br>
disks in the array. So, if I form a RAID 10 of four 10 GB disks, the<br>
usable size of the array is 20 GB.<br>
<br>
RAID 0+1 and RAID 10 are very similar but, by most measures of both<br>
performance and redundancy, RAID 10 is considered to be preferable.<br>
<br>
A RAID 10 can withstand the failure of a single drive (or multiple<br>
drives, so long as they are NOT in the same mirror set)."<br>
<font color="#888888"><br>
<br>
--<br>
Nikolay Ulyanitsky <<a href="mailto:lystor@lystor.org.ua">lystor@lystor.org.ua</a>><br>
</font><div><div></div><div class="Wj3C7c"><br>
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