| From: | Greg Stark <gsstark(at)mit(dot)edu> |
|---|---|
| To: | PFC <lists(at)boutiquenumerique(dot)com> |
| Cc: | "Joshua D(dot) Drake" <jd(at)commandprompt(dot)com>, "Dave Cramer" <pg(at)fastcrypt(dot)com>, "Michael Ben-Nes" <miki(at)canaan(dot)co(dot)il>, pgsql-performance(at)postgresql(dot)org |
| Subject: | Re: Advice on RAID card |
| Date: | 2005-09-25 17:41:06 |
| Message-ID: | 873bntjb9p.fsf@stark.xeocode.com |
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| Lists: | pgsql-performance |
PFC <lists(at)boutiquenumerique(dot)com> writes:
> Which makes me think that I will use Software Raid 5 and convert the
> price of the card into RAM.
> This should be nice for a budget server.
> Gonna investigate now if Linux software RAID5 is rugged enough. Can
> always buy the a card later if not.
Raid 5 is perhaps the exception here. For Raid 5 a substantial amount of CPU
power is needed.
Also, Raid 5 is particularly inappropriate for write-heavy Database traffic.
Raid 5 actually hurts write latency dramatically and Databases are very
sensitive to latency.
On the other hand if your database is primarily read-only then Raid 5 may not
be a problem and may be faster than raid 1+0.
--
greg
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