Mark and co, I've always been of the opinion that with the advent of Disk Arrays, DEFRAG became useless. It has become one of the biggest waste of time and resources that I come across in way too many shops.
For performance, DEFRAG is going to provide almost nil improvement for sequential, and less for random where the volume you just spent all that time reorganizing is spread across 2, 4, 8, 16 or 32 spindles and sharing those disks with 100s of other volumes. I agree it can help with space allocation, but I can think of a dozen better ways to mitigate space problems than by thrashing your channels and disk drives for a couple of hours every day. It's a great way to trash your remote copy links. In the Windows world DEFRAG is a necessary evil because of the file structures. Consolidating files can make drastic improvements in sequential performance in FAT and NFTS. However, this does not apply to the z/OS world, but the myth continues. Ron > > >I'm inclined to agree; continue the DEFRAG operations. > > Depends. If you defined / migrated all of the DASD to say ... mod-27 or > larger, you probably never need to worry about contiguous space. :-) > > Mark ---------------------------------------------------------------------- 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
