From: Holger Mauermann <mauermann@gmail.com>
To: linux-raid@vger.kernel.org
Subject: LVM on raid10,f2 performance issues
Date: Mon, 01 Dec 2008 01:00:32 +0100 [thread overview]
Message-ID: <49332920.5010503@gmail.com> (raw)
When I setup LVM on top of a 4 disk RAID 10 with f2 layout read/write
performance is really worse - it's far below single drive speed...
I did some testing with dd and hexdump and I noticed that after writing
a 128k file (with 64k "X" and 64k "Y") to the lvol the data on the raw
disks looks somewhat weird:
sda: sdb: sdc: sdd:
----------------------
YYYY .... .... XXXX
.... .... .... ....
XXXX YYYY .... ....
.... .... .... ....
Any hints how to tune this? With LVM on a standard RAID 10 (n2) the data
appears as expected on the disks:
sda: sdb: sdc: sdd:
----------------------
YYYY YYYY XXXX XXXX
.... .... .... ....
.... .... .... ....
.... .... .... ....
next reply other threads:[~2008-12-01 0:00 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-12-01 0:00 Holger Mauermann [this message]
2008-12-01 16:42 ` LVM on raid10,f2 performance issues Keld Jørn Simonsen
2008-12-02 23:28 ` Holger Mauermann
2008-12-03 7:15 ` Keld Jørn Simonsen
2008-12-03 9:43 ` Michal Soltys
2009-01-19 1:24 ` thomas62186218
2009-01-19 7:28 ` Peter Rabbitson
2009-01-26 19:06 ` Bill Davidsen
2009-01-19 7:30 ` Michal Soltys
2009-01-19 12:17 ` Keld Jørn Simonsen
2009-01-19 12:24 ` Peter Rabbitson
2009-01-19 13:59 ` Keld Jørn Simonsen
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