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OpenVMS image backup reports arithmetic trap, integer divide by zero

OpenVMS image backup reports arithmetic trap, integer divide by zero

Sept 01, 2015

Problem

"BACKUP/IMAGE" command results in "arithmetic trap / integer divide by zero" error message.

Example:

$ BACKUP /IMAGE /LOG /IGNORE=INTERLOCK DKA0: DKA100:
%SYSTEM-F-INTDIV, arithmetic trap, integer divide by zero at PC=8048EA98, PS=000 0001B

Affected OpenVMS versions:

  • OpenVMS 6.2-1H3 and below

  • VAX/VMS 6.2-1H3 and below

Affected Charon versions:

  • CHARON-AXP version 4.3 build 14600
    • Solved starting with CHARON-AXP V4.3 build 14601
    • V4.4 build 14802 and above are not affected
  • CHARON-VAX / Linux below build 12100
    • Solved starting with CHARON-VAX build 12100

Solution

This is related to disk size limitation and geometry

(blue star) Default geometry is set to 63 sectors per track and 63 tracks per cylinder

  • Disk images and physical disks can then be used without any issue if their size is less than 128GB

  • For disk images and physical disks larger then 128GB and up to 2TB, override disk geometry from the configuration file as follows:

    set <controller-name> geometry[<unit-no>] = "255/255"

    Example (for DKA100):

    set PKA geometry[100] = "255/255"

    .

(info) Use the "$ SHOW DEVICE <disk> /FULL" command to get disk geometry information
Example:

$ SHOW DEVICE DKA100 /FULL
...
Total blocks        286744185    Sectors per track           63
Total cylinders          6710    Tracks per cylinder         63

...


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