| From: | "Scott Marlowe" <scott(dot)marlowe(at)gmail(dot)com> |
|---|---|
| To: | "Joshua D(dot) Drake" <jd(at)commandprompt(dot)com> |
| Cc: | "Ow Mun Heng" <Ow(dot)Mun(dot)Heng(at)wdc(dot)com>, pgsql-general(at)postgresql(dot)org |
| Subject: | Re: Raid Chunk Sizes for DSS type DB |
| Date: | 2007-10-30 04:18:04 |
| Message-ID: | dcc563d10710292118w366ece3qf1128fabd7e016d9@mail.gmail.com |
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| Thread: | |
| Lists: | pgsql-general |
On 10/29/07, Joshua D. Drake <jd(at)commandprompt(dot)com> wrote:
> On Tue, 30 Oct 2007 09:42:37 +0800
> 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, so I'm going for Raid5 to test out
> > capability before I decide on Raid5 vs Raid1 tradeoff. (Raid1 = No
> > Fault tolerance since 3 drives)
> >
>
> Uhhh RAID 1 is your best bet. You get fault tolerance (mirrored) plus
> you get a hot spare (3 drives).
>
> RAID 5 on the other hand will be very expensive on writes.
I agree. Note that at least in linux, you can have >2 disks in a
mirror. makes reads faster, writes usually not affected too negatvely
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