Peter, Metro Mirror is synchronous replication so I/O operations need to complete (for some definition of complete - typically to a NVS in the controller rather than all the way out to the spindles) at both locations before control is given back to the system so if you had a slowdown on the link between the sites that would definitely impact your job run speeds.
Rex -----Original Message----- From: IBM Mainframe Discussion List <[email protected]> On Behalf Of Peter Sent: Tuesday, February 1, 2022 11:50 AM To: [email protected] Subject: [EXTERNAL] IBM disk replication issue Hello Recently we were a victim of storage replication link between production and DR site(metro mirroring). Due to this many of our batch jobs took more time than expected. So here I would like to understand how the dasd update happens ? For example when a batch allocates some dataset on DASD in production site so does it returns back or finishes off the I/O operation is finished from both production and DR ? If there is latency in dark fibre connectivity between production and DR , Will it impact the batch job elapsed time ? Could someone please shed some light on this? Peter ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN ---------------------------------------------------------------------- The information contained in this message is confidential, protected from disclosure and may be legally privileged. If the reader of this message is not the intended recipient or an employee or agent responsible for delivering this message to the intended recipient, you are hereby notified that any disclosure, distribution, copying, or any action taken or action omitted in reliance on it, is strictly prohibited and may be unlawful. If you have received this communication in error, please notify us immediately by replying to this message and destroy the material in its entirety, whether in electronic or hard copy format. Thank you. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
