What is needed is for IBM to write a "zfsresize" command. This command would reorganize the internals of a zfs, compacting the used portions towards the "front" of the dataset, adjusting the internal pointers, and marking some portion (based on the user's input) as "unusable". Once the UNIX people have written this code, the DFSMS people will need to write code which allows the "excess" space in a VSAM LDS file to be released. Or is this functionality already in SMS. I have a vague memory. Like so many of my memories.
OK, those who want this, write up a business case to show IBM how using up the resources to do this would result in a quantifiable advantage to IBM. I would guess (not sure), that means either makes them more money, or costs them less money in the future (say for maintenance). It pretty much all boils down to money (gained or not spent). Personally, I don't give this a good chance. IMO, the best bet for this is to: 1) calculate how much space you want in the filesystem. 2) allocate a new zFS filesystem with that much space. 3) mount the new zFS filesystem at a new mountpoint. 4) remount the existing zFS filesystem in read-only mode (chmod -r /mount-point) 5) use something like pax to copy the files from the old filesystem to the new one pax -k -pe -rw /old-mount-point /new-mount-point) 6) Unmount the old and new filesystems. 7) mount the new filesystem at the old mount point. 8) Update the BPXPRMxx member of PARMLIB. Instead of the above 6 & 7, once you have the filesystems unmounted, you can rename the old dataset to some different name, and the new dataset to the old name and then do a mount. Of course, steps 6+ assume that you can do the unmount. This is not always possible. If not, you would need to update the BPXPRMnn member and reIPL. In the worse case, perhaps a sysplex wide IPL. -- John McKown Systems Engineer IV IT Administrative Services Group HealthMarkets(r) 9151 Boulevard 26 * N. Richland Hills * TX 76010 (817) 255-3225 phone * john.mck...@healthmarkets.com * www.HealthMarkets.com Confidentiality Notice: This e-mail message may contain confidential or proprietary information. If you are not the intended recipient, please contact the sender by reply e-mail and destroy all copies of the original message. HealthMarkets(r) is the brand name for products underwritten and issued by the insurance subsidiaries of HealthMarkets, Inc. -The Chesapeake Life Insurance Company(r), Mid-West National Life Insurance Company of TennesseeSM and The MEGA Life and Health Insurance Company.SM ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
