z/OS DFSMShsm Diagnosis
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LENGTHS: Specifying how much data to display

z/OS DFSMShsm Diagnosis
GC52-1387-00

Explanation: LENGTHS(bytes ...) is an optional parameter specifying the number of bytes to display. For bytes, substitute a decimal number from 1 to 999999 for the length of the data you want to display.

You can specify a list of bytes that match the specified addresses. For example, the first length you specify applies to the first address, the second length applies to the second address, and so forth. If you specify fewer lengths than addresses, the last length you specify applies to the remaining addresses. The LENGTHS parameter does not specify how much data to display for an address range. If you specify a length with an address range, DFSMShsm pairs the length and address range, but it only uses the address range to determine how much to display.

For example, if you specify the addresses as:
8EC.,.ARCZWRIT.+4,.ARCBACK.+0
where:
  • 8EC. is a separate absolute address
  • .ARCZWRIT.+4 is a separate qualified address
  • .ARCBACK.+0 is another separate qualified address
and you specify the lengths as:
LEN(2,4,3)
then:
  • 2 bytes of data, starting at absolute address 8EC, are displayed
  • 4 bytes of data, starting at qualified address .ARCZWRIT.+4, are displayed
  • 3 bytes of data, starting at qualified address .ARCBACK.+0, are displayed

Abbreviations: None.

Defaults: If you do not specify LENGTHS, the default is four bytes if the address is not the mounted volume table (MVT) control block. If you do not specify LENGTHS when specifying .MVT., the remainder of the MVT control block is displayed.

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