| From: | david(at)lang(dot)hm |
|---|---|
| To: | "Jonah H(dot) Harris" <jonah(dot)harris(at)gmail(dot)com> |
| Cc: | Luke Lonergan <llonergan(at)greenplum(dot)com>, Rajesh Kumar Mallah <mallah(dot)rajesh(at)gmail(dot)com>, pgsql-performance(at)postgresql(dot)org |
| Subject: | Re: setting up raid10 with more than 4 drives |
| Date: | 2007-05-30 05:30:18 |
| Message-ID: | Pine.LNX.4.64.0705292227370.6705@asgard.lang.hm |
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| Lists: | pgsql-performance |
On Wed, 30 May 2007, Jonah H. Harris wrote:
> On 5/29/07, Luke Lonergan <llonergan(at)greenplum(dot)com> wrote:
>> AFAIK you can't RAID1 more than two drives, so the above doesn't make
>> sense
>> to me.
>
> Yeah, I've never seen a way to RAID-1 more than 2 drives either. It
> would have to be his first one:
>
> D1 + D2 = MD0 (RAID 1)
> D3 + D4 = MD1 ...
> D5 + D6 = MD2 ...
> MD0 + MD1 + MD2 = MDF (RAID 0)
>
I don't know what the failure mode ends up being, but on linux I had no
problems creating what appears to be a massively redundant (but small) array
md0 : active raid1 sdo1[10](S) sdn1[8] sdm1[7] sdl1[6] sdk1[5] sdj1[4] sdi1[3] sdh1[2] sdg1[9] sdf1[1] sde1[11](S) sdd1[0]
896 blocks [10/10] [UUUUUUUUUU]
David Lang
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