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Re: setting up raid10 with more than 4 drives

From: mark(at)mark(dot)mielke(dot)cc
To: Luke Lonergan <llonergan(at)greenplum(dot)com>
Cc: Michael Stone <mstone+postgres(at)mathom(dot)us>,pgsql-performance(at)postgresql(dot)org
Subject: Re: setting up raid10 with more than 4 drives
Date: 2007-05-30 15:57:34
Message-ID: 20070530155733.GA18830@mark.mielke.cc (view raw or flat)
Thread:
Lists: pgsql-performance
On Wed, May 30, 2007 at 08:51:45AM -0700, Luke Lonergan wrote:
> > This is standard stuff, very well proven: try googling 'self healing zfs'.
> The first hit on this search is a demo of ZFS detecting corruption of one of
> the mirror pair using checksums, very cool:
>   
> http://www.opensolaris.org/os/community/zfs/demos/selfheal/;jsessionid=52508
> D464883F194061E341F58F4E7E1
> 
> The bad drive is pointed out directly using the checksum and the data
> integrity is preserved.

One part is corruption. Another is ordering and consistency. ZFS represents
both RAID-style storage *and* journal-style file system. I imagine consistency
and ordering is handled through journalling.

Cheers,
mark

-- 
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