Hi sreekumar, you was right in setting bufpool as high as possible. You do not mention plattform/version of you server. I was told by IBM that in latest NT TSM Server versions there are no limits for bufpoolsize exept for usable free system memory (free RAM). If TSM is the only application running on the machine you simply can test a Bufpoolsize usin whole memory minus OS ant ADSM code size.
You surely restart TSM after having bufpoolsize changed, do you? With 3.1 and 3.7 I had very good results with HW upgrade: splitting the DB acros 3 small raid1 arrays and using a scsi controller with 128 on-board cache. To my surprise the caching on controller seemed to work better than the one of TSM itself, so using the max. bufpoolsize of DSM 3.1 which was, I believe, 128 MB, consequently reaching cache hit of about 97% only, was no problem at all (having DB as large as 9 GB ). regards Juraj SALAK Asamer & Hufnagl -----Original Message----- From: Springer Friedrich ,VASL/FAI [mailto:[EMAIL PROTECTED]] Sent: Friday, December 14, 2001 10:50 AM To: [EMAIL PROTECTED] Subject: AW: cache hit percentage is low around 97% Hi, You should set SEFTUNEBUF yes in Your options, because after an expire run TSM tunes the buffer automatically to the rigth value. Also define the new value with BUFPOOlsize nnnn in dsmserv.opt. RESET BUFPOOL in the admin. Windows to see the results. regard Fred -----Ursprüngliche Nachricht----- Von: Pothula S Paparao [mailto:[EMAIL PROTECTED]] Gesendet: Freitag, 14. Dezember 2001 04:23 An: [EMAIL PROTECTED] Betreff: cache hit percentage is low around 97% hi tsm'ers, my cachehit pct utilization sometimes drops to 96.7% and few times i see it touches 99%. due to this i see slow in server process like migration and expiration and sessions hanging for long period of time. please advise me , how can i overcome this. I tried increasing the database bufferpoolsize to the limit mentioned in admin guide. still i see the low pct of cache hit. RAM size is 2GB. your help in this regard is highly appriciated. here is the output of q opt and q db f=d tsm: ADSMSRV1>q opt Server Option Option Setting Server Option Option Setting ----------------- -------------------- ----------------- -------------------- CommTimeOut 6,000 IdleTimeOut 30 BufPoolSize 262144 LogPoolSize 102400 MessageFormat 1 Language en_US MaxSessions 25 ExpInterval 0 ExpQuiet No EventServerLoggi- Yes ng MirrorRead DB Normal MirrorRead LOG Normal MirrorWrite DB Sequential MirrorWrite LOG Parallel VolumeHistory /tsm/config/volhist- Devconfig /tsm/config/devconf- ory.dsm ig.dsm TxnGroupMax 40 MoveBatchSize 40 MoveSizeThresh 500 StatusMsgCnt 10 RestoreInterval 1,440 UseLargeBuffers Yes DisableScheds No NOBUFPREfetch No AuditStorage Yes REQSYSauthoutfile Yes SELFTUNEBUFpools- No SELFTUNETXNsize No ize DBPAGEShadow No DBPAGESHADOWFile dbpgshdw.bdt QueryAuth None LogWarnFullPerCe- 90 nt ThroughPutDataTh- 0 ThroughPutTimeTh- 0 reshold reshold NOPREEMPT ( No ) TCPPort 1500 HTTPPort 1580 HTTPSPort 1543 TCPWindowsize 0 TCPBufsize 16384 TCPNoDelay No IPXSocket 8522 NetbiosBufferSize 16384 NetbiosSessions 25 LuName DSMSERV1 TPNProfilename TPNAME dsmserv IPXBufferSize 4096 CommMethod TCPIP CommMethod ShMem CommMethod HTTP MsgInterval 1 Enable3590Library No ShmPort 1510 FileExit UserExit FileTextExit AssistVCRRecovery Yes AcsAccessId AcsTimeoutX 1 AcsLockDrive No AcsQuickInit No SNMPSubagentPort 1521 SNMPSubagentHost 127.0.0.1 SNMPHeartBeatInt 5 TECHost TECPort 0 tsm: ADSMSRV1>q db f=d Available Space (MB): 4,000 Assigned Capacity (MB): 3,516 Maximum Extension (MB): 484 Maximum Reduction (MB): 1,516 Page Size (bytes): 4,096 Total Usable Pages: 900,096 Used Pages: 141,089 Pct Util: 15.7 Max. Pct Util: 23.6 Physical Volumes: 4 Buffer Pool Pages: 65,536 Total Buffer Requests: 40,149,837 Cache Hit Pct.: 96.65 Cache Wait Pct.: 0.00 Backup in Progress?: No Type of Backup In Progress: Incrementals Since Last Full: 0 Changed Since Last Backup (MB): 147.12 Percentage Changed: 26.70 Last Complete Backup Date/Time: 12/14/01 10:45:42 thanks and regards sreekumar.
