Horrible PostgreSQL performance with NFS

[Claus Guttesen]

> A couple of days ago I've moved our production database from local
> disks to NetAPP filer serving NFS. Performance for this server dropped
> by factor of 10 if not more. From a happy 10% load, the server hit the
> ceiling and sees load of 100% all the time with runqueue above 30. The
>
> I can provide postgresql config. Sysctl knobs remain untouched not
> counting basic NFS tweaking. For mount_nfs I tried to change NFS
> buffer sizes -r -w. I also tried the -L option to keep the lock
> traffic local. On the postgres side, setting fsync = off in
> postgresql.conf. It didn't change a thing.

Did you try tcp?

regards
Claus