You can check the size of your buffer pool by querying your server options.
q opt Ryan Miller Principal Financial Group Tivoli Certified Consultant Tivoli Storage Manager v4.1 -----Original Message----- From: MC Matt Cooper (2838) [mailto:[EMAIL PROTECTED]] Sent: Monday, February 17, 2003 9:45 AM To: [EMAIL PROTECTED] Subject: Re: OS390 SELFTUNEBUFPOOLSIZE yes/no? Paul, How can I tell what size my BUFPOOLSIZE has grown to? I know I start at 32MB but I don't know how much it grows/shrinks. Matt -----Original Message----- From: Seay, Paul [mailto:[EMAIL PROTECTED]] Sent: Monday, February 17, 2003 10:12 AM To: [EMAIL PROTECTED] Subject: Re: OS390 SELFTUNEBUFPOOLSIZE yes/no? I like to set it about 10% higher than the happy point and set it to yes on AIX. Then check it every once and a while to see if it needs adjusting. The problem is you can create a lot of GETMAINs on MVS if you do not set it high enough to begin with. On MVS, you are probably best to set it to NO so that you do not get unpredictable memory usage on the machine. This is the difference between using a dedicated machine for TSM and a general use machine and needing to share with other workloads. You have to tune TSM on MVS like you would a TP monitor like CICS, IMS, etc. Paul D. Seay, Jr. Technical Specialist Northrop Grumman Information Technology 757-688-8180 -----Original Message----- From: MC Matt Cooper (2838) [mailto:[EMAIL PROTECTED]] Sent: Monday, February 17, 2003 9:28 AM To: [EMAIL PROTECTED] Subject: OS390 SELFTUNEBUFPOOLSIZE yes/no? Hello all, I have been reading the dialog on OS/390 performance tuning. I too have found that lowering the size of the address space to 512MB has helped. I have also seen improvements in my throughput by cycling TSM. (I just don't do it as often.) One thing that I was wondering is if anyone has done any research on an advantage to NOT USING SELFTUNBUFPOOLSIZE. Right now I set BUFPOOLSIZE to 32760 and SELFTUNEBUFPOOLSIZE yes. From the looks of things TSM seems to be able to cause some thrashing with MVS memory management. SO I wonder if SELFTUNEBUFPOOLSIZE should be set to NO and just allocate a bigger fixed BUFPOOLSIZE, (like the 128M that was suggested)? Matt