Rick,

Take a look at APARs IC99934 & IT02590 (though supposedly only IT02590
applies to 6.2).  Two different issues with similar symptoms; it took close
to 7 months to get both issues identified.  There are still no patch or
maintenance releases with the fixes yet.  If your symptoms seem to match one
of those APARs, you'll need to open a case with support to get a developer
build of your server version with the fix(es) applied.  (If one of these
issues is what you hit, you were quite lucky that the server recovered on its
own!  I had to halt or externally kill the server almost every time.)

=Dave


On 07/16/2014 10:07 AM, Rhodes, Richard L. wrote:
> Hi Everyone,
>
> The past couple of days we're had a strange problem with one of our TSM 
> instances (v6.2.5).  At times it appears to hang.
>
> Last night (and the previous night) it had many servers that got a dozen or 
> more sessions.  This is really strange!  This morning as I was looking at 
> this, cmds like "q vol" and "q stgpool" hang - no response!  Commands like "q 
> node" and "q proc" work.  The server was doing very little I/O.  All of a 
> sudden the hung cmds all ran through and the server I/O jumped to 
> 200-400MB/s.  Something was locking I/O.  I think the many sessions are 
> clients that retry because the server is not responding.
>
> In the TSM actlog there are no unusual messages about the time it un-stuck.  
> The only strange entry in the actlog is a ANR9999D with lockwait error early 
> the previous evening.    There are no AIX errors.
>
> Any thought?
>
> Rick

--
Hello World.                                David Bronder - Systems Architect
Segmentation Fault                                      ITS-EI, Univ. of Iowa
Core dumped, disk trashed, quota filled, soda warm.   david-bronder AT uiowa 
DOT edu