This also might be a way to go. >From the DFSMS Introduction Manual SC26-7397-02
Using DFSMShsm Control Data Sets DFSMShsm control data sets (CDS) are system-type data sets that DFSMShsm uses to keep track of all DFSMShsm-owned data. They consist of migration, backup, and offline control data sets. The control data sets are an inventory of low activity and inactive data that was stored by DFSMShsm and used to manage its environment. DFSMShsm logs its transactions and maintains multiple backup versions of its CDSs for recovery purposes as specified by the user. DFSMShsm can use VSAM KSDS extended addressability (EA) capabilities that use any of the following serialization techniques for accessing its CDSs: v Record-level sharing (RLS) access mode v CDSQ serialization v CDSR serialization VSAM EA capabilities allow each migration control data set (MCDS), backup control data set (BCDS), and offline control data set (OCDS) cluster to exceed the 4 GB size. The MCDS and BCDS can span up to four unique KSDS clusters. The OCDS is limited to a single cluster. The same serialization technique must be used to access all CDSs -----Original Message----- >From: "O'Brien, David W. (NIH/CIT) [C]" <obrie...@mail.nih.gov> >Sent: Dec 18, 2009 12:30 PM >To: IBM-MAIN@bama.ua.edu >Subject: Re: DFHSM BCDS is going larger > >I checked the archives and the recommendation from a recognized expert on the >subject was freespace(0,50) for the HSM CDSs. > >From your past experience, how soon will you hit the warning threshold of 80%? > >My experience tells me that your rate of increase will slow as VSAM allocates >space where it is needed through CI and CA splits. You'll find the insert >pattern is not uniform. > >I run with freespace(0,0) and although I may notice rapid growth in the week >or so after the reorg, the rate slows dramatically after that. See how long it >takes to reach 80% and if the rate of increase has slowed enough bump the >warning threshold to 90%. Of course your situation may require a larger CDS >using EA. > >Check the Implementation and Customization manual for the following section: >Using VSAM Extended Addressability Capabilities > >Thank You, >Dave O'Brien >NIH Contractor >________________________________________ >From: af dc [acbi...@gmail.com] >Sent: Friday, December 18, 2009 11:48 AM >To: IBM-MAIN@bama.ua.edu >Subject: Re: DFHSM BCDS is going larger > >Hi David, >here are the answers: > >1. I did a reog on it last sunday, 13th Dec, it becames with 52%, today it >has: >ARC0148I BCDS TOTAL SPACE=3132000 K-BYTES, CURRENTLY 868 >ARC0148I (CONT.) ABOUT 68% FULL, WARNING THRESHOLD=80%, TOTAL >ARC0148I (CONT.) FREESPACE=52%, EA=NO, CANDIDATE VOLUMES=0 > >2. about freespace: >STATISTICS > REC-TOTAL--------4498462 SPLITS-CI------------239 > REC-DELETED---------8225 SPLITS-CA--------------0 > REC-INSERTED--------9009 FREESPACE-%CI---------10 > REC-UPDATED--------12843 FREESPACE-%CA---------10 > REC-RETRIEVED---61529041 FREESPC-------1698484224 > >Many thx, A.Cecilio > > > >On Fri, Dec 18, 2009 at 4:30 PM, O'Brien, David W. (NIH/CIT) [C] < >obrie...@mail.nih.gov> wrote: > >> You are only using a little more than half your RBA so I have 2 questions: >> >> 1. How often do you re-org the BCDS? >> >> 2. What are your freespace parameters for the BCDS? >> >> Thank You, >> Dave O'Brien >> NIH Contractor >> ________________________________________ >> From: af dc [acbi...@gmail.com] >> Sent: Friday, December 18, 2009 11:28 AM >> To: IBM-MAIN@bama.ua.edu >> Subject: DFHSM BCDS is going larger >> >> Hello, >> I've DFHSMS V1.8 and our BCDS has: >> >> ALLOCATION >> SPACE-TYPE------CYLINDER HI-A-RBA------3207168000 >> SPACE-PRI-----------4350 HI-U-RBA------1673625600 >> SPACE-SEC--------------0 >> >> so it's reaching the max extents per volume. >> In a near, very near future, I'll have to allocate a larger BCDS, can you >> pls give me an help, from your experience, what is the "best way to grow"?? >> alocate a new one with EA ?? >> >> Many thx, Antonio Cecilio. >> >> ---------------------------------------------------------------------- >> 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 >> >> ---------------------------------------------------------------------- >> 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 >> > >---------------------------------------------------------------------- >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 > >---------------------------------------------------------------------- >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 ---------------------------------------------------------------------- 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
