| 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 |
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| 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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