Jeffrey:
Jeffrey Collyer wrote:
5 identical V440s, Solaris 10, storage on a Netapp via NFS, providing access to
a mailstore (so 80% read, 20% write).
In general, later is better with Solaris 10. Are you on Update 3?
There are many details about the hardware and configuration state
that might give a clue to which known issues you might have as
latent risks. I'd be happy to assist off-alias with helping you vet
the "usual suspects" -- not that I'd want to blunt the thrill of your
DTrace wumpus-hunt!
During the day, randomly a machine will start to climb its load from the
baseline of 2-3 up to 50-60. Under heavy loading, I've seen it go up to 300.
All the time will be in split almost 50/50 user and kernel, no idle, nothing in
I/O (according to top).
'top' itself can contribute to certain problems. I know it's tangential
to your issue, but I recommend learning the joys of 'prstat' in favor
of 'top' on Solaris systems.
I'm suspecting NFS problems, but the Netapp and switch traffic graphics look
clean and consistent. Nothing shows network errors, not nfsstat, not the
switch ports, not the netapp.
Hmmm, have you looked at flow-control events on your switch?
I've heard many anecdotes that disabling Ethernet flow control has
improved results between Solaris and NTAP filers. Also, deploying
jumbo frames can be a big win.
And like I mentioned, the problem moves. One day on machine 1, tomorrow on 4,
etc No real pattern.
That's OK; "it moves" is a pattern. :-)
Wahoowa,
-- Bob Sneed (Engr '78)
How would I go about trying to discover what the kernel is doing when this is
happening. Some of the simple dtrace stuff I've tried have just shown me alot
lof lwp_parks (the main apps is heavily multithreaded, so that figures).
Anyone got any key dtrace probes they look at for NFS or dnlc problems?
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