Re: Performance: NFS v3 mounting with 'noac' option

["Talpey, Thomas" <Thomas.Talpey@netapp.com>]

At 11:13 AM 3/8/2007, Peter Staubach wrote:
>AK wrote:
>> "To use ROMIO on NFS, file locking with fcntl must
>> work correctly on the NFS installation. On some
>> installations, fcntl locks don't work. To get them to
>> work, you need to use Version 3 of NFS, ensure that
>> the lockd daemon is running on all the machines, and
>> have the system administrator mount the NFS file
>> system with the "noac" option (no attribute caching).
>> Turning off attribute caching may reduce performance,
>> but it is necessary for correct behavior."
>
>I think that I would assume that fcntl style locking works on all current
>implementations, that this is not NFS version dependent, and also that
>"noac" is not required in combination with the locking in order to get
>correct behavior.

Ouch - I agree with Peter, this advice is way, way out of date.
<http://www-unix.mcs.anl.gov/romio/>
<http://www-unix.mcs.anl.gov/romio/nfs-instr.txt>

>"The following are some instructions we received from Ian Wells of HP
>for setting the noac option on NFS. We have not tried them
>ourselves. We are including them here because you may find 
>them useful. Note that some of the steps may be specific to HP
>systems, and ..."

Leave noac alone, the Linux client will do the right thing with
its cache when locking is available.

Tom.


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