From: mark@mark.mielke.cc
To: Luke Lonergan <llonergan@greenplum.com>
Cc: Michael Stone <mstone+postgres@mathom.us>
Cc: pgsql-performance@postgresql.org
Subject: Re: setting up raid10 with more than 4 drives
Date: Wed, 30 May 2007 11:57:34 -0400
Message-ID: <20070530155733.GA18830@mark.mielke.cc> (raw)
In-Reply-To: <C282EBA1.31B8C%llonergan@greenplum.com>
References: <C3E62232E3BCF24CBA20D72BFDCB6BF802AF2F1B@MI8NYCMAIL08.Mi8.com>
<C282EBA1.31B8C%llonergan@greenplum.com>
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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To: pgsql-performance@postgresql.org
Cc: mark@mark.mielke.cc, llonergan@greenplum.com, mstone+postgres@mathom.us
Subject: Re: setting up raid10 with more than 4 drives
In-Reply-To: <20070530155733.GA18830@mark.mielke.cc>
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