my everyday struggles with noac……….
"noac" is a mount attribute that disables attribute caching on the client side. If you are on RAC this option is mandatory for mounting shared files with NetApp. I have proved several times now through several tests that our performance is 3 to 4 times slower with the noac option as opposed to mounting the files without noac. Oracle does support RAC on NetApp – and NetApp requires the noac option for RAC. The bottom line the database is suffering from performance problems due to this option ; the current version is SLES 8 and Oracle 9i. NetApp claims that with SLES 9 we should not have any problems and Oracle says Oracle10g On Solaris should not pose any problems. ….well, I will have to see to believe now …we are in the process of a couple of migration tests to get past this problem
more on NetApp and RAC can be found on the below linkhttp://www.ntap.com/library/tr/3359.pdf
more on NetApp and RAC can be found on the below linkhttp://www.ntap.com/library/tr/3359.pdf
posted by Vidya Balasubramanian at
10:51 AM
1 Comments:
i have had similar issues in the past.
just wanted to drop a quick comment here though its late :(
In AS2.1 and RHEL3.0 (pre QU3), we have to use "nointr" and "noac" options.
In SLES9 , we should use "actimeo=0" instead of "noac" option.
Not sure about SLES 8 though. wud like to see an update to your post based on your migration results.
By
Arunkumar, at 10:19 AM
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