FRASER, Brian wrote:
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?
Like in very old days: A LOT MORE THAN RECORD INSERT in available free space.
The question is how important is performance of HSM KSDS.
From the other hand size of HSM CDSes can also be important factor, especially
when it's close to 4GB. Although it is possible to grow beyond 4GB limit, but
it requires some actions.
--
Radoslaw Skorupka
Lodz, Poland
----------------------------------------------------------------------
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
