Managing Disk Space Usage; Analyzing Disk Space Usage With The Subsystem Control Facility (Scf) - HP Guardian User Manual

Performing Routine Disk Operations

Managing Disk Space Usage

You should regularly monitor the amount of available space on a system to ensure that
problems do not arise for users because of a lack of available disk space.
Disks, unlike other system resources, are subject to performance degradation simply
through normal usage. The addition and deletion of records and files can cause file and
disk fragmentation over time. Adding large amounts of data to a file can cause
inefficient internal file structures.
Disks can also become full, which prevents system users from creating additional files,
subvolumes, or volumes.
To make more disk space available to users:
1. Analyze your current available disk space.
2. Create more disk space as needed based on your analysis, by either using DCOM to
compress existing files and subvolumes, or by purging old and unneeded files and
subvolumes.
You can analyze disk space using either the Subsystem Control Facility (SCF) or the
Disk Space Analysis Program (DSAP).

Analyzing Disk Space Usage With the Subsystem Control Facility (SCF)

The SCF STATUS DISK, DETAIL command lists the number of free pages, the sizes of
contiguous blocks of free pages, and the number of files currently on a specified disk. It
also lists the number of pages in the primary extent of the disk directory, and the number
of extents that have been allocated for the disk directory.
To check the free space on a disk with the SCF STATUS DISK, DETAIL command,
enter:
> SCF STATUS DISK $disk,
The format of the resulting display and details about this command are described in the
SCF Reference Manual for the Storage Subsystem.
Example
To display disk free-space information for the disk $AMBER, enter:
> SCF STATUS DISK $AMBER, DETAIL
DETAIL
Guardian User's Guide —425266-001
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Managing Disk Space Usage