| From: | SZALAI Karoly <czw(at)debian(dot)hu> |
|---|---|
| To: | pgsql-admin(at)postgresql(dot)org |
| Subject: | Re: H/W RAID 5 on slower disks versus no raid on faster HDDs |
| Date: | 2002-11-26 14:28:45 |
| Message-ID: | 20021126142845.GA29775@webvilag.com |
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| Lists: | pgsql-admin |
On Mon, Nov 25, 2002 at 11:43:56AM +0100, Sander Steffann wrote:
> > (mirroring). A hardware RAID controller is faster than
> > software RAID.
> lot faster than hardware RAID in many cases. I prefer hardware RAID myself
> because of the simplicity (the OS doesn't need to know about the RAID
> configuration), but I hear good results from people running on software
> RAID.
yes, hw raid is simply, but it's slow.
i've tested it many brand machine. ibm serveraid card w/ raid5 is
about HALF speed than sw raid. according to bonnie++, debian,
2.4.19+grsec kernel.
the machine ibm xseries 255, 2 xeon mp cpus, 4x18G 10k rpm disk.
the bonnie tested with 6G files, 1.5G physical ram and 1G swap.
if somebody needs those results, i can send it.
--
CZW
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