Date: Fri, 25 Dec 2009 09:39:17 -0500 From: Thomas Burgess <wonslung@gmail.com> To: Wes Morgan <morganw@chemikals.org> Cc: freebsd-fs@freebsd.org Subject: Re: ZFS RaidZ2 with 24 drives? Message-ID: <deb820500912250639j6db8c383u3c9c344d06928d6c@mail.gmail.com> In-Reply-To: <alpine.BSF.2.00.0912250833330.87887@ibyngvyr> References: <568624531.20091215163420@pyro.de> <957649379.20091216005253@pyro.de> <26F8D203-A923-47D3-9935-BE4BC6DA09B7@corp.spry.com> <1696529130.20091223212612@pyro.de> <op.u5gbvfgz8527sy@82-170-177-25.ip.telfort.nl> <deb820500912241646p7c8fd726n5c68895105e28907@mail.gmail.com> <1266543768.20091225120330@pyro.de> <deb820500912250311y14cd0975i4e3a28c5fea24789@mail.gmail.com> <982740779.20091225122331@pyro.de> <alpine.BSF.2.00.0912250833330.87887@ibyngvyr>
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> I have my suspicions that this means your filesystem is heavily fragmented. I've had it happen to me on at least 3 pools, some of which were not even close to full, yet rebuilding the pool restored much of the performance. Hopefully with the block pointer rewrite support coming we will get some tools to address this. Right now I am not even aware of a tool that will check for fragmentation. I'm pretty sure he is running on a brand new pool. Originally he asked about creating a raidz2 vdev with 24 drives. Then, he said he "settled" for 2 12 drive vdevs. Also, this being FreeBSD it might be awhile before we even see the block pointer rewrite support even when it DOES hit.
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