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Re: setting up raid10 with more than 4 drives
- From: david(at)lang(dot)hm
- To: "Jonah H. 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: Tue, 29 May 2007 22:30:18 -0700 (PDT)
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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