Ed, I'm sure I'll be corrected if my understanding is in error. The FLASHCOPY proceeds in the background, but the source is available for use immediately as writes to un-copied portions of the source volume are logged and held until the flashcopy completes. Also, reads of uncopied areas of the destination volume pull from the original, as yet unchanged, volume. Once the copy is complete, the logged updates are applied to the source volume. On our DS8100, we flashcopy about 60 VSE volumes each night (waiting 3 seconds between commands) and then immediately bring up our production system. We then immediately start VMBACKUP to grab a full DR copy from the destination volumes. Our production VSE is IPL'd usually within 5 minutes of shutdown. Bob
_____ From: The IBM z/VM Operating System [mailto:[EMAIL PROTECTED] On Behalf Of Edward M. Martin Sent: Wednesday, July 16, 2008 9:17 AM To: IBMVM@LISTSERV.UARK.EDU Subject: Re: FLASHCOPY performance to a DS6800 DASD Hello Larry, I kept hearing those types of numbers. I am very pleasantly surprised. Ed Martin 330-588-4723 ext 40441 _____ From: The IBM z/VM Operating System [mailto:[EMAIL PROTECTED] On Behalf Of Macioce, Larry Sent: Wednesday, July 16, 2008 10:06 AM To: IBMVM@LISTSERV.UARK.EDU Subject: Re: FLASHCOPY performance to a DS6800 DASD I can't help you with the flashcopy question, but I can tell you our dfdss full backups(3390-3) went from 20-25 min to 6-7 min when we changed out to the ds6k. No one could believe it _____ From: The IBM z/VM Operating System [mailto:[EMAIL PROTECTED] On Behalf Of Edward M. Martin Sent: Wednesday, July 16, 2008 10:00 AM To: IBMVM@LISTSERV.UARK.EDU Subject: FLASHCOPY performance to a DS6800 DASD Hello Everyone, I need some confirmation. I am just amazed at the performance of the DS6800 I just did the z/VM command FLASHCOPY on a 3390-mod 9 on DS6800 to another 3390-mod 9 volume on the DS6800. FLASHCOPY 8A2 0 END TO 8A1 0 END SYNCHRONOUS The command responded instantaneously. SYNChronous tells CP to process the command immediately and does not allow you to enter any other commands until the hardware has accepted all parameters, all messages from the Enterprise Storage Server (ESS) subsystem have been processed, and the FLASHCOPY command completes. Is the DS6800 and the FLASHCOPY really that fast or is there something going on behind the scenes? Performance has been pretty unbelievable but the FLASHCOPY was just too fast. Example Our Batch cycle at night use to take 5-5.5 hours. Started at midnight and Completeed around 5:30 am. Old system EMC SYMETRIC 8 gig of cache and 6 ESCON connections. SWITCH to DS6800. DS6800 2 gig of cache with 4 FICON connections. Batch cycle dropped by 1 hour without any other changes. Start at midnight and completes around 4-4:30 am. Ed Martin 330-588-4723 ext 40441 _____ ******************************************************************** The information transmitted is intended solely for the individual or entity to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of or taking action in reliance upon this information by persons or entities other than the intended recipient is prohibited. If you have received this email in error please contact the sender and delete the material from any computer. ******************************************************************** This electronic transmission and any documents accompanying this electronic transmission contain confidential information belonging to the sender. This information may be legally privileged. The information is intended only for the use of the individual or entity named above. If you are not the intended recipient, you are hereby notified that any disclosure, copying, distribution, or the taking of any action in reliance on or regarding the contents of this electronically transmitted information is strictly prohibited.
