Most likely to be SAN issue and not z/OS. You could look at the RMF Ficon report to see if there is buffer credit starvation, for example. This can occur even if your competing z/OS is idle but has SAN resources allocated in the switch. Also check the RMF ESS Link stats which would show any competing activity (outside of your client's z/OS). If there is congestion, it is your SAN and switches config that needs improvement :)
On Sun, Nov 19, 2023 at 10:00 PM Alain Benvéniste <[email protected]> wrote: > Hi, > > With a z/VM7.3 with the last RSU and a z/OS2.5 I met this week a > performance problem for a client who restores on our site. > > My z/OS is required to restore the z/OS client's bootstrap. > When done I need to change several things for him to IPL. > It means that the dasd are shared between my z/OS and his. > I let my z/OS active, no reason to stop it. > > The client IPL his z/OS and sends his restores. > Checking DASD throughput we are at 1/3 speed that it should. > After spending the day to search, I forced my z/OS.... then all the speed > was there for the client. > > I wonder how my z/OS could impact client's restore just because I access > the dasd, doing absolutely nothing on it. > > This morning I did a backup of client's data, the speed seems ok. > Now I restore and the speed is down to 1/3... > > It looks like z/os brakes througput… > > If you have any clue : I can test. > An issue is opened. > > > Regards > Alain > > ---------------------------------------------------------------------- > 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
