automount limitation?

[Jasmin Berube]

Can we have as many mount points as we want from a client with automount V3, is there any limitation?

[Jeff Schussele]

Hi Jasmin,

I'm sure there's a limit out there, I just don't know for sure what it is.

One thing I would point out is, that IF you do create quite a lot of NFS mounts, you'll probably want to increase the number of NFS daemons running.

You do this in the /etc/rc.config.d/nfsconf file using the NUM_NFSD variable.

Rgds,
Jeff

[Robert-Jan Goossens]

Hi,

On my prod server i have got 370 mounts no problem, even seen over 500 mounts.

I have not seen a max anywhere.

Hope it helps,

Robert-Jan.

[Shannon Petry]

NFS client daemon is not nfsd, but biod. Same file for bumping the number, just bump the number of biod's.

I have automounted in standard v2 over 200 mount points, and had no issues. So cant see why V3 would degrade any.

Automounting does not mount the directory until it is needed, this reduces the amount of biod's you may wish to initially start.

Regards,
Shannon

[Michael Steele_2]

Use NFS version 3.

Large files over 2 gb require some extra care.

Increasing the file system block size helps, especially if you've got one dedicated process using the file system in these istances, but can hurt when several processes are using the file system.

timeouts
retransmissions
dropped packets
bad soft links
(* find . -type l -print | perl -nle '-e || print' *)
export with async option
not enough nfsd daemons

Monitor with nfsstat -rc, netstat -m, vmstat -n, nfsstat -s, and netstat -s -p udp