We had a very similar situation when we first connected an F760 toH
P-UX 10.20. Performance was very poor initially, after some investigation we
found that having no (0) biods running we got much better performance. This can
be changed on HP-UX (10.20 or 11.00) by changing NUM_NFSIOD in the
/etc/rc.config.d/nfsconf file.
Nobody could tell me exactly how
the system was working with no biod processes but it does.
We have a couple of HP-UX 11.0 systems running Oracle 8i
(8.1.6). Each of these systems has about 10-15 small to medium sizedO
racle databases on the system. In order to separate tables, logs, and
archives for availability and recovery in the event of a filer volume failure,
we are using 3 volumes per database. We are using qtrees allow for the
mounting the database tables, logs, and archives separately which allows us to
use failover between the HP servers for each database. This all boils down
to needing 45+ NFS mounts per client.
HP still uses separate biod processes (the default is 4 biod
processes) , and I think each running biod can handle 2 concurrent I/O requests
(this may or may not be configurable by through some kernel parameter - not sure
what the parameter is though).
Does anyone know how to tune the HP-UX client for
the best performance for this many mounts? I currently think we should
bump up the number of biod processes to about 32. We will probably bump up
to 16 for a while just as an intermediate test before we go to 32. Does
anyone know of other changes that will increase NFS client
performance?
Rick Hulsey
Southwest Airlines
2425
Wyman
Mail Stop 4DC
Dallas, Tx., 75235
rick.hulsey@wnco.com
(214) 792-7188
Office
(972) 880-6882 Cell
(800) 915-3747
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