OCFS2, blockdev and readahead
From: Vladimir Barac <vbarac_at_Alghanim.com>
Date: Sun, 8 Feb 2009 12:48:25 +0300
Message-ID: <C85D70C785B07043A485C8AE85E8F671174F6278E2_at_ALGMB.Alghanim.com>
Greetings, listers
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Date: Sun, 8 Feb 2009 12:48:25 +0300
Message-ID: <C85D70C785B07043A485C8AE85E8F671174F6278E2_at_ALGMB.Alghanim.com>
Greetings, listers
Oracle 10.2.0.2, OCFS2, single instance database, NetApp FCP disks
filesystemio_options=setall
db_file_multiblock_read_count=128
Do we need to set readahead to greater than 0 for OCFS2? What would be ideal value? How to measure impact - positive/negative?
Storage admins would prefered "blockdev --setra" to be set to maximum value, to speed up filesystem backups. On the other hand, since oracle will use O_DIRECT on OCFS2, I believe we don't need readahead to be set.
Thanks in advance,
Vladimir Barac
Database administrator | Alghanim Industries
P.O. Box 223, Safat 13003, Kuwait
Tel: +965 1881 111 / ext. 2960
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-- http://www.freelists.org/webpage/oracle-lReceived on Sun Feb 08 2009 - 03:48:25 CST