| From: | Patrick Spinler <spinler(at)kmtel(dot)com> |
|---|---|
| To: | pgsql-admin(at)postgresql(dot)org |
| Cc: | Adam Witney <awitney(at)sghms(dot)ac(dot)uk> |
| Subject: | Re: Postgresql on software RAID |
| Date: | 2003-12-17 04:30:04 |
| Message-ID: | 3FDFDBCC.6060609@kmtel.com |
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| Lists: | pgsql-admin |
Adam Witney wrote:
> Hi all,
>
> I am experimenting with a few OS's for my new hardware. I plan to have a
> software RAID5 device for my pgsql data directory.
>
> I have been experimenting with FreeBSD and with Linux, does anyone have any
> thoughts on whether vinum RAID devices are better than Linux software RAID?
> Or vice versa... Or no difference at all? Any gotchas I should bear in mind?
>
Of interest, there are a number of "old school" dba's of my aquantance
who swear vociferously whenever the words RAID 5 and Database are
mentioned in association with each other.
According to the theory they expound, a database with any significant
write activity whatsoever should never be on raid 5, but instead be on
raid 0+1.
I've never had a chance to benchmark a comparison between the two and
draw my own conclusions, but it might be interesting to do so.
-- Pat
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