On Wed, 20 Jun 2012 09:44:57 -0500, Elardus Engelbrecht <elardus.engelbre...@sita.co.za> wrote:
>Good day > >I have reviewed our SMFDUMP program as well the one in CBTTAPE file 686. > >Why is there a GRS ENQ? Is it needed? APAR? documentation? logic? > >I see those names: > >SMFQNAME DC CL8'IPOSMF01' >SMFRNAME DC CL7'DATASET' > >and scope is SYSTEM? > >What will break if I do not use GRS and then fall through RESERVE which is >indeed not recommended? > >The reason is that we sometimes we get a deadly embrace where two SMFDUMP >issue those ENQs and then while the system is doing its 'I SMF' things, it >still scans the DASD despite that we do not record SMF type 19. > >In the end I need to cancel one of those SMF jobs, let the other run and retry >with possible loss of data. > >The alternative is that I need to space out those 'I SMF' across the sysplex >over longer elapsed wall clock time. >Or making those QNAME / RNAME combination unique per LPAR? Will something >break? >Or making those wait time in SMFDUMP shorter? > >I'm asking this because the way how 'I SMF' is partly documented. > >Other question: In our GRSRNLxx is this line: > >RNLDEF RNL(EXCL) TYPE(GENERIC) QNAME(SYSSMF01) > >Anyone knows who is using it? Of course you could point me to any >documentations. > >Thanks very much in advance. > I'm not sure exactly. Maybe to keep 2 of them start are started at the same time from causing a problem since nothing else uses that qname/rname. As for the RESERVEs done when the output is on DASD, I commented out that code 15 years ago. I have no clue what purpose it serves to reserve the entire volume when writing an output data set to disk. Regards, Mark -- Mark Zelden - Zelden Consulting Services - z/OS, OS/390 and MVS mailto:m...@mzelden.com Mark's MVS Utilities: http://www.mzelden.com/mvsutil.html Systems Programming expert at http://expertanswercenter.techtarget.com/ ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
