NFS Performance Tuning for HP-UX 11.0 and 11i Systems

nfs performance tuning for hp-ux 11.0 and 11i systems page 94

Notes:

Page 94July 22, 2002

Which protocol should you use?

• In most environments, PV3 provides superior

performance

• PV2’s edge in asynchronous write performance is usually

offset by the larger packet sizes afforded by PV3

• If the network is dropping large PV3 requests, the request

size can be reduced via the rsize and wsize mount

options. Alternately, NFS/TCP can be used to reduce

the amount of data sent during a retransmission.

• Directory retrieval issues caused by READDIRPLUS can

be avoided by disabling this feature on the server

nfs pv2

vs.

nfs pv3

NFS PV3 is a superior protocol to PV2. In nearly every situation a PV3

client/server will outperform a similarly configured PV2 client/server. In those rare

occasions where PV2 might have a slight advantage over PV3 (such as

asynchronous writing or directory traversal where file attributes are not needed) the

PV3 implementation on HP-UX systems can be modified to work around the issue.