From: Stan Hoeppner <stan@hardwarefreak.com>
To: xfs@oss.sgi.com
Subject: Re: Verify filesystem is aligned to stripes
Date: Thu, 25 Nov 2010 01:00:37 -0600 [thread overview]
Message-ID: <4CEE0995.9030900@hardwarefreak.com> (raw)
In-Reply-To: <20101125054607.GM13830@dastard>
Dave Chinner put forth on 11/24/2010 11:46 PM:
> Because writes for workloads like this are never full stripe writes.
> Hence reads must be done to pullin the rest of the stripe before the
> new parity can be calculated. This RMW cycle for small IOs has
> always been the pain point for stripe based parity protection. If
> you are doing lots of small IOs, RAID1 is your friend.
Do you really mean RAID1 here Dave, or RAID10? If RAID1, please
elaborate a bit. RAID1 traditionally has equal read performance to a
single device, and half the write performance of a single device.
--
Stan
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next prev parent reply other threads:[~2010-11-25 6:59 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-11-24 18:39 Verify filesystem is aligned to stripes Spelic
2010-11-25 5:46 ` Dave Chinner
2010-11-25 7:00 ` Stan Hoeppner [this message]
2010-11-25 10:15 ` Dave Chinner
2010-11-25 22:57 ` Stan Hoeppner
2010-11-26 8:16 ` Emmanuel Florac
2010-11-26 12:22 ` Dave Chinner
2010-11-26 13:15 ` Spelic
2010-11-26 14:05 ` Michael Monnerie
2010-11-26 14:36 ` Emmanuel Florac
-- strict thread matches above, loose matches on Subject: below --
2010-11-26 2:43 Richard Scobie
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