From: Rajesh Kumar Mallah <mallah.rajesh@gmail.com>
To: mark@mark.mielke.cc <mark@mark.mielke.cc>
Cc: 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: Thu, 31 May 2007 01:28:58 +0530
Message-ID: <a97c77030705301258u1ef4e895h8fd32bfcadf22248@mail.gmail.com> (raw)
In-Reply-To: <20070530155733.GA18830@mark.mielke.cc>
References: <C3E62232E3BCF24CBA20D72BFDCB6BF802AF2F1B@MI8NYCMAIL08.Mi8.com>
<C282EBA1.31B8C%llonergan@greenplum.com>
<20070530155733.GA18830@mark.mielke.cc>
Sorry for posting and disappearing.
i am still not clear what is the best way of throwing in more
disks into the system.
does more stripes means more performance (mostly) ?
also is there any thumb rule about best stripe size ? (8k,16k,32k...)
regds
mallah
On 5/30/07, mark@mark.mielke.cc <mark@mark.mielke.cc> wrote:
> 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: mallah.rajesh@gmail.com, mark@mark.mielke.cc, llonergan@greenplum.com, mstone+postgres@mathom.us
Subject: Re: setting up raid10 with more than 4 drives
In-Reply-To: <a97c77030705301258u1ef4e895h8fd32bfcadf22248@mail.gmail.com>
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