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Re: setting up raid10 with more than 4 drives

From: Stephen Frost <sfrost(at)snowman(dot)net>
To: Luke Lonergan <llonergan(at)greenplum(dot)com>
Cc: 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 03:31:52
Message-ID: 20070530033152.GV7531@tamriel.snowman.net (view raw or flat)
Thread:
Lists: pgsql-performance
* Luke Lonergan (llonergan(at)greenplum(dot)com) wrote:
> Hi Rajesh,
> 
> On 5/29/07 7:18 PM, "Rajesh Kumar Mallah" <mallah(dot)rajesh(at)gmail(dot)com> wrote:
> 
> > D1 raid1 D2 raid1 D5  --> MD0
> > D3 raid1 D4 raid1 D6  --> MD1
> > MD0 raid0 MD1  --> MDF (final)
> 
> AFAIK you can't RAID1 more than two drives, so the above doesn't make sense
> to me.

It's just more copies of the same data if it's really a RAID1, for the
extra, extra paranoid.  Basically, in the example above, I'd read it as
"D1, D2, D5 have identical data on them".

	Thanks,

		Stephen

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