What IBM actually say is: " IBM also recommends that installations define their CDSs with FREESPACE(0) so VSAM can figure out where space is needed and perform the necessary CI/CA splits when doing inserts. This will create space where needed and eliminate the need for the extra space that would be required if the CDSs were defined with FREESPACE(50 50)"
http://publib.boulder.ibm.com/infocenter/ieduasst/stgv1r0/topic/com.ibm.iea.zos/zos/1.0/DFSMS/BestPractices1.pdf?dmuid=20061231222703561774 Personally I doubt that the performance degradation would even be noticeable, how long does a CA split take these days? <snip> What IBM actually say is: Reorg with FREESPACE(0 0) and let DFSMShsm split midsection intervals ► Performance is degraded for about 2-3 weeks during this process ► Do not panic when you see HURBA/HARBA ratio increase during first several days In other words if your DFHSM is not busy enough to be affected by a large number of CA splits then (0 0) should be fine. However if you have very active DFHSM then you should go with (50 50) and mitigate the performance hit. </snip> ----------------------------------------------------------------------------------- This e-mail is sent by Suncorp-Metway Limited ABN 66 010 831 722 or one of its related entities "Suncorp". Suncorp may be contacted at Level 18, 36 Wickham Terrace, Brisbane or on 13 11 55 or at suncorp.com.au. The content of this e-mail is the view of the sender or stated author and does not necessarily reflect the view of Suncorp. The content, including attachments, is a confidential communication between Suncorp and the intended recipient. If you are not the intended recipient, any use, interference with, disclosure or copying of this e-mail, including attachments, is unauthorised and expressly prohibited. If you have received this e-mail in error please contact the sender immediately and delete the e-mail and any attachments from your system. If this e-mail constitutes a commercial message of a type that you no longer wish to receive please reply to this e-mail by typing Unsubscribe in the subject line. ---------------------------------------------------------------------- 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
