Tom, LLA with freeze in simple terms puts a copy of the directory into memory to eliminate directory search IO.
VLF is a facility to buffer active load modules, execs, etc; but VLF does not buffer normal PDS members like copybooks, JCL etc. I solved exactly this problem at a Telco in Australia by forcing PDSE caching of the copybook library members. This was done by setting up a STORCLAS with MSR=3 to indicate MUST Cache (nowadays MSR=1 is recommended for Must Cache). This was a DFSMS1.3. The buffering facility has been screwed around by a few bugs over the years, but it's still there. There is a good write up at http://www.redbooks.ibm.com/abstracts/tips0567.html?Open that should help you out. Ron > -----Original Message----- > From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On > Behalf Of Tom Rusnak > Sent: Thursday, 15 June 2006 4:36 PM > To: [email protected] > Subject: LLA and Cobol copybook library > > Hi all, > > I have a production Cobol Copybook library that is accessed thousands of > times a day during compiles. It's only updated during one 'promote' job > in the evening. > > I'm looking to improve it's performance by getting LLA to manage the > directory which has over 10,000 members. I update the LLA with the > LIBRARIES(COPYBOOK.LIB) and FREEZE(COPYBOOK.LIB) statements and it appears > to work. I can update a member and both ISPF and batch still see the > before > member. So far so good. > > My first question, is this a valid/acceptable use of LLA to manage > non-loadlibraries? > > a "D LLA" command shows the library as frozen. > > However, a "D LLA,STATISTICS" doesn't show any MEMBERS FETCHED or DASD > FETCHES. Peter Relson's module fetch monitor doesn't show access for the > non loadmodule library. Any suggestions on how to monitor the progress? > > Finally, Is there any way to get VLF involved as well? > > All the best, > > Tom > > ---------------------------------------------------------------------- > 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 ---------------------------------------------------------------------- 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
