How to disable SCSI write cache on RHEL
Date: Tue, 29 Sep 2009 22:06:24 -0400 (EDT)
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