RE: Oracle over NFS

Tom,

Check out the following metalink note: "Mount Options for Oracle files when 
used with NAS devices [ID 359515.1]".
noac is not listed in the required mount options.

The network discards is something that should not happen.
Can you post all the mount options that ou are using, your kernel options and 
some more information about your network config?

Also check out the blog from Kevin Closson (kevinclosson.wordpress.com), it has 
lots of information about running Oracle over NFS.


regards,



Freek D'Hooge
Uptime
Oracle Database Administrator
email: freek.dhooge@xxxxxxxxx
tel +32(0)3 451 23 82
http://www.uptime.be
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________________________________________
From: oracle-l-bounce@xxxxxxxxxxxxx [oracle-l-bounce@xxxxxxxxxxxxx] On Behalf 
Of Thomas Roach [troach@xxxxxxxxx]
Sent: 19 April 2010 20:12
To: Oracle Discussion List
Subject: Oracle over NFS

Hi,

We are currently on Oracle RAC 10.2.0.4 (4 nodes) on Linux x86_64 RHEL 5.3. We 
are currently using block devices on Hitachi but have invested in a NetApp. Our 
2 options are NFS (which the Unix admin favors) and Block devices over Fiber 
Channel. In trying the various NFS option, we have come across 2 mount options 
that Oracle must use. (noac and actimeo=0). With noac, the performance is 
horrible (about 10 MB/s) and with actimeo=0 we get about 240 MB/s which is the 
maximum bandwidth the interface will support (3 - 1Gbps Nics on the NetApp 
side). With the actimeo=0, we get better performance but see a large amount of 
network discards. He has essentially said I am putting it back to noac to get 
rid of the network discards. I said if the performance goes back to 10 MB/s 
then we can't move to NFS over NetApp. I wanted to get some insight from the 
group as I get conflicting information when researching this issue.

Does anyone out there have Oracle RAC running over NFS to NetApp and if so, 
what mount options are you using? Any specific configurations on the NetApp 
side? Forgot to mention that we are using a single Cisco switch between the 
NetApp and Oracle servers running with jumbo frames.

Thanks!

Tom

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