Thanks to all that contributed to this thread. We recently separated two lines of business, each with its own sysplex, jesplex, etc.
As it turns out, I discovered the reason for the TGSIZE=24: tens of thousands of small PRT jobs generated daily. So while I won't be changed that JESPLEX environment, I will be going with the default of 30 in the other JESPLEX environment. Have a great day! Stay safe and healthy!! Bob -----Original Message----- From: IBM Mainframe Discussion List <[email protected]> On Behalf Of Mark Jacobs Sent: Wednesday, April 22, 2020 7:35 AM To: [email protected] Subject: Re: JES2 SPOOLDEF TGSIZE recommendation sought I was actually working on a local site problem that required reading up on this very topic a week or so ago. On a 3390 formatted track JES2 there are 12 buffers(with BUFSIZE=3992). So your TGSIZE of 24 meant that JES2 would allocate 2 tracks at a time. Changing TGSIZE to 30 will actually result in 36 buffers being allocated, using three tracks. Mark Jacobs Sent from ProtonMail, Swiss-based encrypted email. GPG Public Key - https://api.protonmail.ch/pks/lookup?op=get&[email protected] ‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐ On Wednesday, April 22, 2020 7:27 AM, Jousma, David <[email protected]> wrote: > Yea, just getting my coffee too... Looks like TGSIZE is easy enough to make > larger, no so much to make smaller....I guess if you are going to change, > then make the change before you add the new volumes. Once formatted, it > doesn't change? > > TGSIZE=nnn|30 > Specifies the number (1-255) of JES2 buffers to be contained in a track > group. JES2 uses this value to determine the number of tracks in a track > group on each spool device. This is the default value for the number of track > groups for each new spool volume added to the complex. Because the number of > tracks in a track group will vary based on the track capacity of the device, > the resultant value is rounded to the minimum integral number of tracks that > can contain the specified number of buffers. > If you specify TGSIZE=, it must contain a value from 1 to 255. Regardless of > the value specified, the minimum resulting track group size is one track and > the maximum is the smaller of 255 and the number of tracks in the first > extent of the SYS1.HASPACE data set with the least number of tracks. > > Note: If you do not specify TGSIZE= as the same value on all members of the > complex, JES2 might not use the value specified here for a new spool volume. > Performance Considerations: Attempt to tailor the value of TGSIZE to fit the > majority of the jobs in your system. SMF type 26 records can be used to > assist your choice of a value for this parameter. > > Small values for TGSIZE= can cause an excessive number of track group > allocations per job thus increasing processor overhead. For example, an > IEFBR14 job requires 13 spool buffers for control blocks and JCL data sets; > therefore, set the value of TGSIZE= greater than 13. Large values for TGSIZE= > can waste spool space and unnecessarily increase seek time. > > Modification: Minimum action to modify is $T SPOOLDEF to increase and a JES2 > cold start to decrease. > > Dave Jousma > AVP | Manager, Systems Engineering > > Fifth Third Bank | 1830 East Paris Ave, SE | MD RSCB2H | Grand > Rapids, MI 49546 > 616.653.8429 | fax: 616.653.2717 > > -----Original Message----- > From: IBM Mainframe Discussion List [email protected] On Behalf Of > Richards, Robert B. > Sent: Wednesday, April 22, 2020 7:00 AM > To: [email protected] > Subject: Re: JES2 SPOOLDEF TGSIZE recommendation sought > > CAUTION EXTERNAL EMAIL > > DO NOT open attachments or click on links from unknown senders or > unexpected emails > > Dave, > > At your request! I should have provided it before...now where is that 2nd cup > of coffee? > > Bob > > SPOOLDEF BUFSIZE=3992,DSNAME=SYS1.HASPACE,DSNMASK=, > FENCE=(ACTIVE=NO,VOLUMES=1),GCRATE=NORMAL, > LASTSVAL=(2007.287,19:42:13),LARGEDS=ALLOWED, > SPOOLNUM=64,TGSIZE=24,TGSPACE=(MAX=2443200, > DEFINED=1900575,ACTIVE=1900575, > PERCENT=32.1218,FREE=1290076,WARN=80), > TRKCELL=3,VOLUME=JESS > > -----Original Message----- > From: IBM Mainframe Discussion List [email protected] On Behalf > Of Jousma, David > Sent: Wednesday, April 22, 2020 6:56 AM > To: [email protected] > Subject: Re: JES2 SPOOLDEF TGSIZE recommendation sought > > It would be helpful if you could post the output of a $DSPOOLDEF > command. We run with mod-54's with no issues. Just make sure you code > LARGEDS=ALLOWED > > $SPOOLDEF > SPOOLDEF BUFSIZE=3992,DSNAME=SYS1.HASPACE,DSNMASK=, > FENCE=(ACTIVE=NO,VOLUMES=1),GCRATE=NORMAL, > LASTSVAL=(2007.294,12:08:34),LARGEDS=ALLOWED, > SPOOLNUM=96,TGSIZE=30,TGSPACE=(MAX=2524640, > DEFINED=1202032,ACTIVE=1202032, > PERCENT=49.1162,FREE=611639,WARN=80), > TRKCELL=3,VOLUME=JESD > > Dave Jousma > AVP | Manager, Systems Engineering > > Fifth Third Bank | 1830 East Paris Ave, SE | MD RSCB2H | Grand > Rapids, MI 49546 > 616.653.8429 | fax: 616.653.2717 > > -----Original Message----- > From: IBM Mainframe Discussion List [email protected] On Behalf Of > Richards, Robert B. > > Sent: Wednesday, April 22, 2020 6:49 AM > To: [email protected] > Subject: JES2 SPOOLDEF TGSIZE recommendation sought > > CAUTION EXTERNAL EMAIL > > DO NOT open attachments or click on links from unknown senders or > unexpected emails > > For years, we have run with 3390-3 spool volumes and a TGSIZE=24. I am not > sure when or why the default became 30 and why it was not changed in my shop. > Probably the wisdom of it is not broke, do not fix it. Okay, so much for > history. > > Shortly, there will be a push to go to all higher capacity spool volumes. At > the moment, it looks like we are going to MOD-27s. What I am trying to > determine is a better value for TGSIZE given the migration to the MOD-27s. > TGSPACE has recently been tripled (still relatively small at 2.4 million). > The rest of the numbers associated with SPOOLDEF are defaults. > > Any suggestions would be appreciated. If it matters, DS8886 DASD. > > Thanks in advance! > > Bob > > > ---------------------------------------------------------------------- > ---------------------------------------------------------------------- > ---------------------------------------------------------------------- > ---------------------------------------------------------------------- > ---------------------------------------------------------------------- > ---------------------------------------------------------------------- > ---------------------------------------------------------------------- > ---------------------------------------------------------------------- > ---------------------------------------------------------------------- > ---------------------------------------------------------------------- > ---------------------------------------------------------------------- > ---------------------------------------------------------------------- > ---------------------------------------------------------------------- > ----------- > > For IBM-MAIN subscribe / signoff / archive access instructions, send > email to [email protected] with the message: INFO IBM-MAIN > CAUTION EXTERNAL EMAIL > > DO NOT open attachments or click on links from unknown senders or > unexpected emails > > This e-mail transmission contains information that is confidential and may be > privileged. 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