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Special Forums IP Networking [solaris]TCP clnt_max_conns testing tuning Post 302870101 by jim mcnamara on Friday 1st of November 2013 07:15:47 AM
Old 11-01-2013
I have an m4000 with 6 10GB nics. With link aggregation. We have clnt_max_conns=1. If you have the correct drivers you normally do not need to tweak this. It is meant for a really fast system connected to lots of slower or very remote boxes (with lots of latency) to enable multiplexing. It handles the disparity in local response times. Like multipathing.

Try loading and then measuring:

Maybe the NFS traffic load across systems is not high enough to push the new connection(s). Or your code base is really well-written. Unlikely, I admit. Ours is awful.

So - artificially increase the NFS traffic by writing some threaded code that reads (or writes) many files at one time. Be sure to do something to avoid the effects of local file caching, or what you will really be measuring is not NFS TCP effects. This will not fly on a production box. You should have svc_t waits of 50ms+ (as a guess) if you are really saturating the connection/driver.

IMO, what you want to look at is iostat -xnmz 1 10 - svc_t time, %b, etc.
-- for NFS mounts. iperf is also relevant, BTW. It is a valid tool.

If your before/after change does not impact this kind test, you are wasting your time with the change.
 

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unshare_nfs(1M) 					  System Administration Commands					   unshare_nfs(1M)

NAME
unshare_nfs - make local NFS file systems unavailable for mounting by remote systems SYNOPSIS
unshare [-F nfs] pathname DESCRIPTION
The unshare command makes local file systems unavailable for mounting by remote systems. The shared file system must correspond to a line with NFS as the FSType in the file /etc/dfs/sharetab. OPTIONS
The following options are supported: -F This option may be omitted if NFS is the first file system type listed in the file /etc/dfs/fstypes. FILES
/etc/dfs/fstypes /etc/dfs/sharetab ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWnfssu | +-----------------------------+-----------------------------+ SEE ALSO
nfsd(1M), share(1M), attributes(5) NOTES
If the file system being unshared is a symbolic link to a valid pathname, the canonical path (the path which the symbolic link follows) will be unshared. For example, if /export/foo is a symbolic link to /export/bar (/export/foo -> /export/bar), the following unshare command will result in /export/bar as the unshared pathname (and not /export/foo): example# unshare -F nfs /export/foo For file systems that are accessed by NFS Version 4 clients, once the unshare is complete, all NFS Version 4 state (open files and file locks) are released and unrecoverable by the clients. If the intent is to share the file system after some administrative action, the NFS daemon (nfsd) should first be stopped and then the file system unshared. After the administrative action is complete, the file system would then be shared and the NFS daemon restarted. See nfsd(1M) SunOS 5.11 6 May 2003 unshare_nfs(1M)
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