The only errors are TCP/IP connection failures or refusals on the client
and the server.  The command line admin client is also unable to connect
so running a trace is tough.  We have eliminated the network as causing
the problem.  Since TSM does not recover from the problem a restart is
required.

When I do a show thread there is a line that is "Thread table size". I
am assuming that is a thread limit of some sort.  Do you know if this is
correct?

I have reduced the storage pool volume count by about 150 and TSM was
able to handle more sessions before it would no longer accept
connections.  This makes we believe that there is some sort of limit on
the number of threads that is well below the AIX 5.1 limit.  This limit
may be something doing with available RAM or some other cause.  I do
think I inadvertently found the cliff and jumped...

Andy Huebner
-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
Richard Sims
Sent: Sunday, January 08, 2006 9:04 AM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: [ADSM-L] Primary disk pool volume limit

On Jan 6, 2006, at 2:41 PM, Andy Huebner wrote:

> How would I determine what the per-process thread limit is?  Your
> suggestion of a thread limitation seems to fit the known facts.

Andy - Here's some info from my AIX notes...

Threads, maximum number                 The programming limits are
defined in
                                         /usr/include/pthreads.h and
                                         /usr/include/sys/limits.h as:
                                          #ifdef _LARGE_THREADS
                                          #define PTHREAD_THREADS_MAX
32767
                                          #else
                                          #define PTHREAD_THREADS_MAX
512
                                         These defines prevail in AIX
4.3, 5.1,
                                         and 5.2.  AIX redbook
"Developing and
                                         Porting C and C++
Applications on AIX"
                                         says that 512 is a
sufficient number for
                                         most multi-threaded
applications,
                                         regardless of 32- or 64-bit
applications.
                                         If pthread_create() goes
over the limit,
                                         errno EAGAIN (11) will occur.
                                         Note that the creation of
Pthreads
                                         consumes the process heap.
                                         I'm not aware of any system
file
                                         configuration option which can
                                         artificially limit the
number of threads
                                         per process.

I verified the behavior with a programming test.
There's no telling what value the AIX TSM server may have been
compiled with.
Again, ANR messages and AIX Error Log entries should say what the
issue is.

    Richard Sims


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