RE: How to disable SCSI write cache on RHEL
- From: "Matthew Zito" <mzito@xxxxxxxxxxx>
- To: <vishal@xxxxxxxxxxxxxxx>, <oracle-l@xxxxxxxxxxxxx>
- Date: Wed, 30 Sep 2009 00:40:29 -0400
Not worth the effort you're investing. You're more likely to hit a bug with
regular I/O on a forced directio system than you are to have corruption due to
a write on a regular filesystem for a non datafile.
Matt
-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx on behalf of Vishal Gupta
Sent: Tue 9/29/2009 9:56 AM
To: oracle-l@xxxxxxxxxxxxx
Subject: How to disable SCSI write cache on RHEL
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
Other related posts:
