I agree with lizette. I/O reports should tell you. On 20 Apr 2014 10:18, "Lizette Koehler" <[email protected]> wrote:
> Do you have any automation tools like OPS/MVS or Tivoli or other? > > Perhaps you need a timer in the VARY command step to delay the time the > next step runs. > > The vary may not be slow, but the IO Subsystem to the array may not be > coming back quickly enough. Have you run performance reports on the > storage array itself when the commands are running? > > Lizette > > > > -----Original Message----- > > From: IBM Mainframe Discussion List [mailto:[email protected]] On > > Behalf Of baby eklavya > > Sent: Saturday, April 19, 2014 9:28 PM > > To: [email protected] > > Subject: Re: Slow vary commands processing > > > > That's the problem with us now ...we don't see significant difference > from the logs . > > > > When one device is varied offline , it gets processed instantly > > > > When vary is issued against a set of devices (may be 10 ) , we see a > delay of 15 to > > 20 seconds . But our storage person keeps complaining that vary commands > are > > processed slow . I believe , it is because there are so many backup jobs > failing from > > last few months compared to earlier . > > > > For eg , we had an abend yesterday where STEP 1 issues a vary command > against > > a set of volumes . And STEP 2 runs an ICKDSF to init the volume . > > It fails saying the volume is not offline . > > > > Looking at CMDS display , we don't see anything queued up for long . > > > > Nothing was changed in the system recently . > > > > > > > > > > > > > > > > > > On Sun, Apr 20, 2014 at 9:35 AM, Lizette Koehler > > <[email protected]>wrote: > > > > > How did you determine they are slow. > > > > > > How long do you think they should take? > > > How long would it normally take? > > > How long does it now take? > > > How many devices are in the vary command at one time? > > > > > > What analysis have you done to determine "slow" > > > > > > What timings do you get when you vary one device compared to 10 > > > compared to 100? > > > > > > Do you see any error messages indicating the commands are not > processing? > > > > > > Have you issued the CMDS command to see what is going on at the same > > > time as the slow commands? > > > > > > > > > Lizette > > > > > > > > > > -----Original Message----- > > > > From: IBM Mainframe Discussion List > > > > [mailto:[email protected]] On Behalf Of baby eklavya > > > > Sent: Saturday, April 19, 2014 8:54 PM > > > > To: [email protected] > > > > Subject: Slow vary commands processing > > > > > > > > Greetings , > > > > > > > > In our shop , we see that vary commands are processed slow most of > > > > the > > > time . We > > > > have not applied any maintenance recently and there are no messages > > > > or > > > dumps > > > > which actually tell us why this happen . Can someone share some > > > possibilities in > > > > general when this can happen ? > > > > > > > > We are running z/os 1.11 on a Z196 processor with DS8800 boxes . > > > > > > > > Regards, > > > > baby > > > > > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to [email protected] with the message: INFO IBM-MAIN > ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
