we have problems with disconnections ("unexpected network error" - often after 90 minutes) with volumes attached to Citrix servers (and only with Citrix). While searching for a solution I came across the parameter "max-mpx" for CIFS multiplex settings - for the affected SVM this is currently set to 255.
In the past, "cifs stat" could be used to determine what values were actually being used though and it looked like (Example!): "Max Multiplex = 459, Max pBlk Exhaust = 0, Max pBlk Reserve Exhaust = 0".
Where can I find this value under Ontap 9.7? When I collect values with " statistics start -object cifs ... " I don't find it there for example.
I have to elaborate; the volume in question is on SSD, latencies are below 0.3ms and IOPs average 36. It doesn't look like there are any real performance problems here, but an availability problem of the file share - it crashes several times a day (there are no error messages in the event log of the cluster). The volume is used for Citrix; it provides user directories for LotusNotes.
A Notes consultant suspects that it is due to a limitation of "Open File Handler" or similar parameters. During my search for similar errors, I came across the parameter "Max Multiplex", which has probably led to similar errors in the Citrix environment - with the wrong specifications.
Now I'm trying to find out what value this "Max Multiplex" actually assumes in productive operation - but I don't know how.
Or do you have other ideas on how I can check the permanent availability of the share?
thanks for the message; but I was already aware of the article.
It refers to ONTAP 7 and ONTAP 8 and unfortunately does not explain how to determine under ONTAP 9 (9.7 in our case) which values "Max Multiplex" assumes in operation - "cifs stat" does not work here:
Error: show failed: Default sample not found. To collect a sample, use the "statistics start" and "statistics stop" commands. To view the data sample, use the "statistics show" command with the "-sample-id" parameter.
When using "statistic starts -object ..." I do not know in which "object" "Max Multiplex" can be found (object cifs or cifs_ctx is not).