VOLFRAG: show disk fragmentation

Description

Disk management utility. Shows the physical order of files on a disk. Report may be in file or disk order.

Categories

Disk Management
System Operation

Related files

VOLFRAG: Object file for the program.

User Instructions

Run the program, specifying the range (file, library, or volume) and the names of the file, library, or volume. The next screen selects the sort order for the report; this can either be by file within library or in physical disk order. When the run is completed, the DISPLAY utility can be called to display the listing on the workstation. VOLFRAG can be re-run from this screen.

Two reports are produced. The first consists of a summary page of the total usage for that volume, while the second report lists files in the extent or file name order, as selected. The file detail includes the number of extents, the blocks used, the file organization and record format, the record length, and the user ID.

Programmer Instructions

All program screens in VOLFRAG are GETPARMs, so the utility can be run under program control. Unlike DISKMAP, it does not require exclusive access to the volume, so it is unnecessary to re-mount the disk for this purpose.

INPUT       Press (RETURN) to continue or PF(16) to exit.

  RANGE     VOLUME      Set to LIBRARY or FILE if desired.

  FILE      (blank)     The location of the file, library,
  LIBRARY   (blank)     or volume to be analyzed.
  VOLUME    (blank)

OPTIONS     Press PF(02) to sort report by file within
            library or PF(03) to sort in disk extent order.

EOJ         Press PF(01) to run again, PF(13) to display the
            report from the last run, or PF(16) to exit the
            program.

Example of use

As with DISKMAP, VOLFRAG can be used to improve disk performance by identifying the locations of frequently-accessed files so they can be moved closer to the Volume Table of Contents (VTOC) for the volume. VOLFRAG offers the additional benefit of running for a single file or library.

Comments

Unlike the similar utility DISKMAP, VOLFRAG can be run without exclusive access to the volume. It can also be run for a library or file rather than just for a volume.

For other programs that show physical disk location, see DISKMAP, FILEPARM, LISTLABL, and VTOCTEST.