5 Disk Space Analysis Program (DSAP)
The Disk Space Analysis Program (DSAP) analyzes how disk space is used on a specified volume.
DSAP copies the disk directory and free-space table to the current work file. By specifying options,
you can manipulate this data to produce several different reports about the use of the disk space
for that volume.
The free-space table is limited only by your primary (main) and secondary (contiguous disk space)
memory requirements.
NOTE:
The version of DSAP must match the version of the NonStop operating system to ensure
compatibility with low-level system interfaces. Therefore, the G08 version of DSAP runs on G06.24
and later RVUs, the G07 version of DSAP runs only on the G06.23 RVU, and the G06 version
runs on G06.00 through G06.22 RVUs.
NOTE:
DSAP supports 512-byte disks and 514-byte disks. For a 512 byte sector disk, DSAP
reports the actual physical extent sizes including the check block information. The unused pages
column of the DSAP report considers the check blocks. If an unstructured file with checksum blocks
has 14 pages (28 K) allocated for an extent and only 1 page (2 K) is utilized, 2 pages (4 K)
contain the checksums. Therefore, the unused pages are shown as 14 pages. The Dealloc pages
column of the DSAP report considers the check blocks.
Page
Topic
(page 90)
Security
(page 91)
DSAP Syntax
(page 93)
Reporting SMF Files
(page 93)
Exiting DSAP
(page 93)
Stopping DSAP
(page 93)
DSAP Options
(page 98)
Completion Information
(page 99)
Guidelines: Running DSAP
(page 101)
Report Formats
(page 109)
DSAP Examples
(page 110)
Format of the Permanent Work File
Security
DSAP is privileged. Each customer determines which users are allowed to run it. To control access
to DSAP:
•
Do not license the program file for general use. Without licensing, only the super ID (255,255)
can run DSAP.
•
License the program file and limit access to a subset of users by setting file security attributes
or by using a Safeguard access-control list.
DSAP measures disk space and has no effect on the system, so restricting its use is often unnecessary.
However, it might not be preferable in some environments to permit general access to some of the
reports generated by DSAP.
To set the appropriate level of access to DSAP and all other system utilities, see the security policy
standards established by your organization. For a complete discussion about securing information
on a NonStop system, see the Security Management Guide.
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Disk Space Analysis Program (DSAP)
