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тАО11-07-2010 04:49 AM
тАО11-07-2010 04:49 AM
Dear All,
In HP-UX, we have bypass our OS cache for oracle by using "mincache=direct,convosync=direct" in the /etc/fstab file which is attached with this thread.
My query is how to do this in RHEL 5.4 64 bit OS??
Thanks
Minhaz
In HP-UX, we have bypass our OS cache for oracle by using "mincache=direct,convosync=direct" in the /etc/fstab file which is attached with this thread.
My query is how to do this in RHEL 5.4 64 bit OS??
Thanks
Minhaz
Solved! Go to Solution.
2 REPLIES 2
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тАО11-07-2010 06:48 AM
тАО11-07-2010 06:48 AM
Solution
In Linux, this can be done within Oracle: there is no need to do anything at the OS level.
In Oracle 9i or 10g, set Oracle parameter "filesystemio_options" to "setall" or "directio", and Oracle will automatically use Linux API to request direct I/O whenever appropriate.
(With setting "setall", you'll also get asynchronous I/O whenever appropriate; with "directio" you'll get Direct I/O only.)
This document is written for RHEL 4 and older, but is mostly good for RHEL 5 too:
http://www.puschitz.com/TuningLinuxForOracle.shtml#EnablingAsynchronousIOSupport
Here's a RedHat document for configuring Oracle on RHEL 5. It's talking about GFS, but the asynchronous and direct I/O features will work on ext3 filesystems too.
http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5/html/Configuration_Example_-_Oracle_HA_on_Cluster_Suite/oracle_settings.html
MK
In Oracle 9i or 10g, set Oracle parameter "filesystemio_options" to "setall" or "directio", and Oracle will automatically use Linux API to request direct I/O whenever appropriate.
(With setting "setall", you'll also get asynchronous I/O whenever appropriate; with "directio" you'll get Direct I/O only.)
This document is written for RHEL 4 and older, but is mostly good for RHEL 5 too:
http://www.puschitz.com/TuningLinuxForOracle.shtml#EnablingAsynchronousIOSupport
Here's a RedHat document for configuring Oracle on RHEL 5. It's talking about GFS, but the asynchronous and direct I/O features will work on ext3 filesystems too.
http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5/html/Configuration_Example_-_Oracle_HA_on_Cluster_Suite/oracle_settings.html
MK
MK
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тАО11-07-2010 09:26 PM
тАО11-07-2010 09:26 PM
Re: how to bypass Disk IO buffer in RHEL 5 for oracle
Thanks a lot MK. I have got my answer.
BR
Minhaz
BR
Minhaz
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