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VSAM File Tuning, ICF/VSAM Catalog Reporting, VTOC Display and Modification

CBLVCAT Examples Menu

Often, planning for new operating systems and/or new disks is necessary long before the appropriate documentaion is available, this is made easy with CBLVCAT's modelling facility.

The output, for the purpose of this example, is deliberately restricted to 1 file only via the KEY=FILE.TO.MODEL parameter. 

  CBLVCAT REL 2.10 AT COMPUTE (Bridgend) Ltd - Wales                           (OS) VM/CMS=VM03      14.21 FRI 26 SEP 2003    PAGE   1
o --------------------------------------------------                                --------------------------------------    -------- o

     ** VMXVTUN2 CTL M ***        L=002   2003/09/26 14:13:00      *id *
o      listcat  dd=CBL111                                                                                                              o
              key=FILE.TO.MODEL
              tune=MVS  dev=3390
o                                                                                                                                      o

  USERCAT CBL111 (3380)  TYPE      NRECS   PCNT  ---- ALLOC TRACKS ----   FRSP   LMAX  KL,RKP  CISIZE BUFSP EXCPS     TIMESTMP
o ---------------------  ----      -----   ----    TOTAL   PRIME  SEC     CI CA  ---- /BLK/IMB ------ /IXL  -----     --------         o


o FILE.TO.MODEL          KSDS     448275 **93.7**  C=140   C=120   C=10    0  1   617V 26,0    14336  32768  58.3K 2003/06/09 21.19.23 o
                                                 VOL1=CBL111
                                       CANDIDATE VOL2=CIS475                                                        ** 318 CI SPLITS**
o                                                                                                                   ** 054 CA SPLITS** o
                           IX        138 **89.1**      5       4      1          1017           1024  IXL=3  26.1K
                                                 VOL1=CBL111
o                                      CANDIDATE VOL2=CIS475                                                                           o

      ** SEV 2-05 **   CA SPLITS EXIST
o     ** SEV 2-08 **   CI SPLITS TOO HIGH (2 PC OF INSERTS)                                                                            o
      ** SEV 2-15 **   34 CYLS CAN BE RECOVERED WHEN TUNED
      ** SEV 2-25 **   INEFFICIENT DATA CISIZE
o     ** SEV 2-28 **   TUNING FOR DEVICE CHANGE REQUEST                                                                                o
      ** SEV 2-31 **   AVLRECL: DEFINED=617     ESTIMATED=188
       * SEV 1-09 *    FILE GETTING/IS FULL
o      * SEV 1-18 *    SEC EXTENTS EXIST                                                                                               o

       *** WARN  015 *** LARGE AVLRECL CHANGE
o                                                                                                                                      o

       CBL TUNED FOR DEV 3390                                                                                  
o      ----------------------                                                                                                          o
       DATA  (                           -                                                                     
           CISZ         (18432)          - * NEW PHYREC SIZE=18432, CURRENT=7168  (DEV CHANGE)                 
o          CYLINDERS    (106,14)         - * OPTIMISED FOR DEVICE GEOMETRY                                                             o
           RECORDSIZE   (188,617)        - * DEFINED AVLRECL=617                                               
           BUFFERSPACE  (40960)          ) * 40K MINIMUM FOR DIRECT PROCESSING                                 
o                                                                                                                                      o
                                           * USING AVLRECL=188    --- FILE CAPACITIES (NRECS) ---              
                                           *             ------ TUNED ------           --- ORIG (ESTD) ---     
o                                          *             PCNT   PRIME    SEC           PCNT   PRIME    SEC                             o
                                           *             ----   -----    ---           ----   -----    ---     
                                           *  INIT LOAD  100      452K  59.8K           93      401K  33.4K    
o                                          *       FREE    2     10.3K  1358             2     9120    760                             o
                                           *             ---      ----  -----           --      ----  -----    
                                           *             103      463K  61.1K           95      410K  34.2K    
o                                          *             ---      ----  -----           --      ----  -----                            o
                                                                                                               
                              OPTIONAL JCL OVERRIDE FOR SEQ I/O                                                
o                             ---------------------------------                                                                        o
                              BUFND=5      * (90K)  FAST                                                       
                              BUFND=8      * (144K) URGENT                                                     
o                             BUFND=23     * (414K) **TURBO**  (BUT WILL IMPACT OTHER WORK)                                            o


o      *** WARN  001 *** 10 = RETURN CODE FROM CBLVCAT                                                                                 o


o          ** ** ** ** ** ** ** CBLVCAT IS LICENSED BY COMPUTE (BRIDGEND) LTD +44 (1656) 652222 & 656466 ** ** ** ** ** ** **          o
                                                    ** EXPIRY DATE -- 12 JUN 2004 **

Notes:

Tuning is requested for MVS via the TUNE=MVS parameter, the change from 3380 to 3390 disks is indicated via the DEV parameter.

The user is able to plan the new operating system and DASD requirements even before a decision to convert is made.

The Data CISIZE increases from 14336 to a more efficient 18432, which causes a change in physical record size from 7k to 18k.

In addition to tuning for increased track capacity (3390=55k, 3380=46k) the file is tuned to improve performance. The new Allocation of CYL(106 14), ensures that the primary allocation is large enough to accommodate all of the records currently in the file.

Tuning for a 3380 would have given the larger value of CYL(127 16). Thus tuning for the new disk device ensures the user does not waste disk space when changing DASD.

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2006-09-13 14:50