Experimental Physics and
Industrial Control System

"Jeff Hill" <[email protected]> · 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

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System