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<== Date ==> <== Thread ==>

Subject: RE: channel access dicsconnects
From: "Jeff Hill" <johill@lanl.gov>
To: "Kevin Tsubota" <ktsubota@keck.hawaii.edu>, <tech-talk@aps.anl.gov>
Date: Tue, 16 Jan 2001 09:56:04 -0700
> 
> We two MV2307s in seperate VME crates running EPICS.  In one of the
> crates I have to EPICS sequencers that monitor channels on the 
> other crate.
> 
> Periodically this crate will lose its channel access connection
> to the other and never reconnect, as if the crate that its connecting
> to was powered off.  However this is not the case. Both crates are
> up and running and the only problem is that the first crate got
> disconnected from the second and never reconnects.
> 
> "caget" on the disconnected channels work fine.
> 
> Does anyone have any clues what could be causing these disconnects
> and why the sequencers won't reconnect?  We are running VxWorks 5.3.1
> and EPICS R3.13.0Beta12.
> 

Kevin,

First, I would verify that ping, telnet, etc work against both VME crates.
Next, I would run ping on the disconnected crate against the server that
it disconnected from. I would also run "memShow()", "iosFdShow()", 
and "mbufShow()" on both hosts. If all of the above are ok then I would 
run "tt()" against the sequencer and ca client tasks to see if there are 
any indications that some thread is hung. It might help to save a base line
"tt()" output for related threads after the system boots up and then compare
this to what you see when it is disconnected. I am happy to help out 
interpreting any output which appears to be off normal.

I should add that many subtle bugs have been fixed between EPICS R3.13.0Beta12 
and the latest patch release of R3.13.

Jeff



References:
channel access dicsconnects Kevin Tsubota

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