Hi, Has anyone experiences with using DFSMSdss DEFRAG with Flashcopy II enabled DASD controllers you would care to share? It looks like at z/OS R5 DFSMSdss was enhanced to exploit data set level Flashcopy by DEFRAG.
The FASTREPLICATION(REQUIRED | PREFERRED | NONE) keyword tells DFSMSdss how you want to use fast replication methods such as FlashCopy. The default is FASTREPLICATION(PREFERRED). http://shareew.prod.web.sba.com/client_files/callpapers/attach/SHARE_in_New_ York/S3037LG.pdf We had not been running DEFRAG or COMPAKTOR on scheduled basis for a long time due to the contention it causes on our DASD. This is worsened as we move to large volumes sizes with 3390-9, 3390-27, 3390-54 all in play here. One of our storage guys has made an effort to get COMPAKTOR running for most of the non-database, non-system volumes in the shop recently every week to do defragmentation and data set grooming. It tends to hang up some number of jobs and this is worsened by the fact we use Thruput Manager and most jobs are in STANDBY mode which is not visible to COMPAKTOR. I am really interested in DFSMSdss DEFRAG performance compared to COMPAKTOR especially with Flashcopy II available. The folks at Innovation indicate they have benchmarked FlashCopy II exploitation and that it has not been implemented in COMPAKTOR because it doesn't really help. I wondered what results anyone had gotten with IBM DEFRAG since it appears that put quite a bit of work in to exploit it. The solution I had used for years in a smaller environment was to simply avoid any kind of scheduled DEFRAG processing as it was too impacting instead only doing defrag on an exception basis. This did require managing to a little higher level of free space in the pools. Other solutions on the market include Interchips Real-Time Defrag now marketed by Mainstar. http://www.mainstar.com/products/hsmt/rtd/index.asp http://shareew.prod.web.sba.com/client_files/callpapers/attach/SHARE_in_New_ York/S3023kra.pdf What are you doing today with DEFRAG? Do you still run daily or weekly DEFRAG or COMPAKTOR runs? Any other options out there? Thanks, Sam Knutson, GEICO Performance and Availability Management mailto:[EMAIL PROTECTED] (office) 301.986.3574 Disc space, the final frontier! <> ==================== This email/fax message is for the sole use of the intended recipient(s) and may contain confidential and privileged information. Any unauthorized review, use, disclosure or distribution of this email/fax is prohibited. If you are not the intended recipient, please destroy all paper and electronic copies of the original message. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
