| From: | Hannes Dorbath <light(at)theendofthetunnel(dot)de> |
|---|---|
| To: | "Joshua D(dot) Drake" <jd(at)commandprompt(dot)com>, Ow(dot)Mun(dot)Heng(at)wdc(dot)com |
| Subject: | Re: Raid Chunk Sizes for DSS type DB |
| Date: | 2007-10-30 08:37:07 |
| Message-ID: | 4726ED33.40004@theendofthetunnel.de |
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| Thread: | |
| Lists: | pgsql-general |
On 30.10.2007 03:11, Joshua D. Drake wrote:
> Ow Mun Heng <Ow(dot)Mun(dot)Heng(at)wdc(dot)com> wrote:
>
>> It's not an optimal setup but since I only have 3x500G drives to play
>> with, I can't build a Raid10
>
> Uhhh RAID 1 is your best bet. You get fault tolerance (mirrored) plus
> you get a hot spare (3 drives).
This is not true with Linux MD RAID.
It might sound scary to most people, but you _can_ have a RAID 10 with
only 3 drives.
http://en.wikipedia.org/wiki/Non-standard_RAID_levels#Linux_MD_RAID_10
Another thing you want to do is to check if the MD device you created
supports barriers. I know MD RAID 1 does, MD RAID 5 does not, I don't
know about MD RAID 10.
If it does not, make sure you have an UPS.
--
Regards,
Hannes Dorbath
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