Dear group,
at our shop we use the LLA-freeze-option for all our LLA-Dataset,
mostly Lnklst-Datasets but also some non-Lnklst-DS (non-PDS/E).
We defined our CSVLLA-Class big enough:
CLASS NAME(CSVLLA)
EMAJ(LLA)
MAXVIRT(131072)
but the amount of storage is only used up to 40% (SMF41(1)). Now, when i issue
a 'D LLA,STATS' i see many DASD FETCHES, i.r.:
LIBRARY: SYS1.SERBLINK
MEMBERS: 195
MEMBERS FETCHED: 25 MEMBERS IN VLF: 0
DASD FETCHES: 501 VLF RETRIEVES: 6
Are there some requirements for the modules to use VLF?
During some testings I made a pgm, which loaded a module (non-RENT)
about 4000 times. If this module is in VLF at starting time, it always
will be loaded from VLF-cache (VLF RETRIEVES get high) . If the module
is not in cache at start time of my pgm, 4000 DASD calles will be issued.
Strange behaviour. Does somebody has an idea, or a hint, where to find
some usefull IBM-documentations about VLF. We have z/OS 1.13, but with
z/OS 1.12 we had the same behaviours. CSVLLIX1 and CSVLLIX2 or on.
Any hint appreciated
With best regards
Monika
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