Mark Zelden wrote: > On Wed, 15 Apr 2009 10:50:37 +0200, R.S. <r.skoru...@bremultibank.com.pl> > wrote: > > >> By the way: is there any procedure to defrag HFS/ZFS ? >> I mean some process similar to PDS compress or KSDS reorg. >> Is there any need to do it? >> How to measure it? >> >> Further explanation: I'm not talking about defragmentation o f volume >> containing HFS dataset, rather about defragmentation of the dataset content. >> >> -- >> > > > For HFS, it shouldn't be needed - similar to PDSE (assuming the files within > the HFS aren't in use). Pages from deleted files or index pages are > can be reused after the last connection to the file has been terminated. > See similr past discussions on PDSE (especially in the LNKLST) in the > archives. > > For zFS, space is reused also. I suggest you read the zFS admin guide and > in particular the section on zFS disk space allocation that describes how > system and user areas are allocated in the aggregate. > > Do you have a reason or evidence that makes you think you need to > defrag / reorg an HFS or zFS? > > Mark > -- > Mark Zelden > Sr. Software and Systems Architect - z/OS Team Lead > Zurich North America / Farmers Insurance Group - ZFUS G-ITO > mailto:mark.zel...@zurichna.com > z/OS Systems Programming expert at http://expertanswercenter.techtarget.com/ > Mark's MVS Utilities: http://home.flash.net/~mzelden/mvsutil.html > > We have a problem when a hfs/zfs grows to a huge size and since partial release doesn't work on these files to recover the allocated but unused space we have to perform a copy process to a new dataset.
-- Mark Jacobs Time Customer Service Tampa, FL ---- "The avalanche has already started. It is too late for the pebbles to vote." -- Kosh, "Babylon 5" ---------------------------------------------------------------------- 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
