Allowing growth to span volumes may be a good thing, but don't forget that that may fry your backup/recovery/DR strategy.
Many use full volume dump/restore as a foundation. Unless -all- of the volumes are dumped at a single point of consistency (POC), then you'll have corrupted datasets. With the size of today's DASD farms, getting a window wide enough to get that POC is quite the challenge. -----Original Message----- From: IBM Mainframe Discussion List [mailto:ibm-m...@bama.ua.edu] On Behalf Of Ulrich Krueger Sent: Thursday, March 04, 2010 1:08 PM To: IBM-MAIN@bama.ua.edu Subject: Re: Defrag In that case, Mark, it appears to me that your storage group must be running rather full and could probably benefit from adding a few more volumes, specifically 3390-9 or larger volumes. Or perhaps you should review your DFHSM ML1/ML2 migration criteria and migrate old datasets to reclaim some space. On the other hand, the suggestion to allow a dataset to grow to multi-volume sounds like a good idea (as it would eliminate space-related abends), albeit perhaps just a stop-gap measure. Another thing you could do to make contiguous space available is that you could free up one volume by moving all (or most of) the datasets off to other volumes within that storage group. Just pick the one that looks the worst and clean it up. That gives you contiguous free space within the group to satisfy large allocation requests and should take less time and resources to run than all the defrags together. HTH. Regards, Ulrich Krueger -----Original Message----- From: IBM Mainframe Discussion List [mailto:ibm-m...@bama.ua.edu] On Behalf Of Mark Pace Sent: Thursday, March 04, 2010 10:40 To: IBM-MAIN@bama.ua.edu Subject: Re: Defrag Well it's not a performance issue I'm trying to resolve. It's simply having the volumes so fragmented that users sometimes have a hard time finding the amount of space they need in 16 extents. <snipped> ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html NOTICE: This electronic mail message and any files transmitted with it are intended exclusively for the individual or entity to which it is addressed. The message, together with any attachment, may contain confidential and/or privileged information. Any unauthorized review, use, printing, saving, copying, disclosure or distribution is strictly prohibited. If you have received this message in error, please immediately advise the sender by reply email and delete all copies. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
