RAID Performance Questions
milo at cyberlifelabs.com
Thu Jan 25 21:19:39 UTC 2007
On Jan 25, 2007, at 12:15, Chuck Swiger wrote:
> Still, you also ought to consider that a 3-disk RAID-5
> configuration is very much not ideal from either an efficiency or
> performance standpoint-- you want more like 5 or 6 drives being
> used, in which case your performance numbers ought to increase
> some. This is also somewhat true of the 4-disk RAID-10 config;
> using 6 or all 8 drives would likely improve performance compared
> with striping against only two disks.
Unfortunately, I'm a bit limited in terms of equipment and
application requirements. For starters, the app specs currently call
for two arrays: one for general file-serving and databases, and the
other for backups. Due to limited hardware I'm to run both on the
same controller. Far from ideal, I know, but it's what I have.
Second, I need to keep at least one drive as a hot-spare. Thus, I
have seven drives that I somehow need to partition into two groups
and maximize performance without sacrificing reliability. Lastly, the
RAID controller does not permit more than two drives in a RAID-1 set.
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