OK, last post from me on this subject to give the solution. The problem was some resource shortage, most likely a thread limitation, software or hardware. Once we reduced our storage pool volume count to under 1,700 TSM was able to handle its workload of 300+ peak concurrent sessions. We reduced the number of volumes, not the total size of the pools.
For comparison the header on Show Thread is: Thread table size: 3136 Active threads: 1741 Zombie threads: 0 Cached descriptors: 3 The fatal number of active threads for this system is about 2,100. This was taken with the system basically at idle. Thanks Mr. Sims for providing the needed nudge in the right direction. Andy Huebner -----Original Message----- From: ADSM: Dist Stor Manager [mailto:[EMAIL PROTECTED] On Behalf Of Richard Sims Sent: Monday, January 09, 2006 9:25 AM To: ADSM-L@VM.MARIST.EDU Subject: Re: [ADSM-L] Primary disk pool volume limit On Jan 8, 2006, at 9:06 PM, Andy Huebner wrote: > ... > 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? It would seem to be TSM's personal choice for a table which manages thread information. There's no doc on this that I know of, but may be the table in which TIDs area created in pthread_create() operations. We don't know if it is of fixed size, or whether TSM may reallocate it if the table needs to be larger. My hunch is the latter. FYI, here's a snapshot of mine, at a time when the server is busy with backups: Thread table size: 128 Active threads: 94 Zombie threads: 0 Cached descriptors: 5 > > 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... A thought: Threads space comes out of the Heap. When starting the TSM server, assure that your memoryuse Unix Resource Limit is not artificially low. (In csh and tcsh, see this with the 'limit' command.) Richard Sims This e-mail (including any attachments) is confidential and may be legally privileged. If you are not an intended recipient or an authorized representative of an intended recipient, you are prohibited from using, copying or distributing the information in this e-mail or its attachments. If you have received this e-mail in error, please notify the sender immediately by return e-mail and delete all copies of this message and any attachments. Thank you.