| From: | Greg Stark <gsstark(at)mit(dot)edu> |
|---|---|
| To: | pgsql-general(at)postgresql(dot)org |
| Subject: | Re: disk performance benchmarks |
| Date: | 2004-09-15 06:07:08 |
| Message-ID: | 877jqwuktv.fsf@stark.xeocode.com |
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| Lists: | pgsql-general pgsql-performance |
Vivek Khera <khera(at)kcilink(dot)com> writes:
> On Sep 14, 2004, at 9:49 PM, Joshua D. Drake wrote:
>
> > It is my experience that RAID 5 is not that great for heavy write situations
> > and that RAID 10 is better.
> >
> It is my experience that this depends entirely on how many spindles you have in
> your RAID. For 4 or 5 spindles, I find RAID10 faster. With 14 spindles, it
> was more or less a toss-up for me.
I think this depends massively on the hardware involved and the applications
involved.
For write heavy application I would expect RAID5 to be a lose on any
software-raid based solution. Only with good hardware raid systems with very
large battery-backed cache would it begin to be effective.
--
greg
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