Obtaining real storage data

Use the IPCS RSMDATA subcommand to obtain information about storage usage and any unusual condition that have occurred prior to requesting the stand-alone dump. In the RSMDATA output, if the percent usage field is 100%, there are no frames left. Also, the percent of available total fixed frames should not be a high number. If it is, there can be a program using too many resources to complete. For example, in Figure 1, the percent of available total fixed frames is at 25%.

Figure 1. Example: RSMDATA output

                     R S M   S U M M A R Y   R E P O R T
                          Tot real Below Prf real Dbl real      Expanded
                          -------- ----- -------- -------- -------------
In configuration . . . .    33,792 4,096   33,742        -        49,152
Available for allocation    32,672 4,089   33,742      120        49,152
Allocated  . . . . . . .    32,398 3,964   33,483      113        48,594
Percent usage  . . . . .        99    96       99       94            98
Common fixed frames  . .     3,087   317    3,087        -             -
  Percent of available .         9     7        9        -             -
Total fixed frames . . .     8,338   907        -        -             -
  Percent of available .        25    22        -        -             -

You can also check the ASM control blocks to determine the statistics applicable to I/O requests. The I/O requests received and completed should be the same. In Figure 2, note that the 509577 I/O requests received have all been completed.

Figure 2. Example: ASMCHECK output

ASMVT AT 00FD8030
509577 I/O REQUESTS RECEIVED, 509577 I/O REQUESTS COMPLETED BY ASM
240487 NON-SWAP WRITE I/O REQUESTS RECEIVED, 240487 NON-SWAP WRITE I/O
       REQUESTS COMPLETE
PART AT 01CB5310
PAGE DATA SET 0 IS ON UNIT 15B
PAGE DATA SET 1 IS ON UNIT 15B
PAGE DATA SET 3 IS ON UNIT 14A
PAGE DATA SET 4 IS ON UNIT 150
PAGE DATA SET 5 IS ON UNIT 15B