[CentOS] nfs slow?

nate centos at linuxpowered.net
Wed Dec 10 22:11:14 UTC 2008


John Kordash wrote:
>> 2.) Use TCP, UDP Transmits are often slow these days. (mount
>> option tcp)
>
> Hmm, care to share any references for this?  I'd be reaching for NFS over
> TCP in a long-haul type environment, but would run it over UDP otherwise.

At least in my case, both of the vendors I am using for high
performance NFS (BlueArc, and Exanet) have tcp as a best
practice. Exanet actually runs on top of CentOS 4.4 though
does not use the linux NFS stack.

These are the options I use for Exanet:
rw,bg,hard,intr,tcp,nfsvers=3,timeo=2,retrans=10,rsize=32768,wsize=32768

These are the options I use for BlueArc:
rw,bg,hard,intr,proto=tcp,nfsvers=3,timeo=600,rsize=32768,wsize=32768

Exanet is an active-active cluster, the BlueArcs are not configured
in any sort of cluster. Planning on retiring the BlueArcs very
soon as they are about to be end of life.

nate




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