How to disable SCSI write cache on RHEL
- From: "Vishal Gupta" <vishal@xxxxxxxxxxxxxxx>
- To: <oracle-l@xxxxxxxxxxxxx>
- Date: Tue, 29 Sep 2009 14:56:49 +0100
Hi,
Does anyone know how to disable filesystem cache at Linux (RHEL4) level? I
know it can be disable using filesytemio_options=directio|setall init.ora
parameters. But that does not protect the other non-database files in case of
server crash. We already have SAN attached disks, so there is plenty of SAN
cache to speed up the things. I want to avoid the risk of filesytem corruption
on linux server crash due to filesystem buffering/caching.
Someone on internet mentioned, one of the way is by executing following
command, but which is the config file which needs to be updated to make things
more persistent.
echo 1 > /proc/scsi/sg/allow_dio
Regards,
Vishal Gupta
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