Guardian User's Guide

Performing Routine Disk Operations
Guardian User’s Guide—425266-001
9-28
Solving Common Disk Problems
Solving Common Disk Problems
Table 9-2. Common Disk Problems
Problem Symptoms Solution
Defective tracks or
sectors exist.
SCF INFO DISK, BAD
output shows unspared
defective sectors.
Spare defective sectors (use the
SCF CONTROL DISK, SPARE
command) if you have the
authorization to do so.
SCF INFO DISK, LOG
output shows a large number
of spared defective sectors.
Back up files to tape, reformat disk,
and restore files to disk.
Performance
problems are
occurring because of
path switches.
Users report poor application
performance or an SCF
STATUS DISK command
shows a nonstandard
configuration.
Use the SCF PRIMARY DISK
command to reverse primary and
backup disk processes.
Disk free-space
fragmentation has
occurred.
Error 43 occurs (unable to
obtain disk space for file
extent).
Use the DCOM program to
consolidate disk space usage.
A disk is full. Error 43 occurs. Ask users to purge files.
An application might go
down.
Identify large, old, and little-used
files with DSAP. Back up such files
or purge them if you have the
authority. (See Listing and Purging
Old Disk Files on page 9-20.)
An Object Monitoring
Facility (OMF) warning can
occur (if threshold has been
set).
If you are authorized, move files to
another disk. If you are not
authorized, notify your
management.
One disk in a
mirrored pair is down.
An event message is
generated, but the application
continues to run.
Use the SCF START DISK
command. If this does not bring the
disk back up, notify your
management; the disk might need
to be repaired or replaced.
An unmirrored disk is
down or both disks in
a mirrored pair are
down.
Users report access problems,
an application goes down,
and event messages can be
generated.
Escalate the problem. (Database
recovery or disk repair might be
required.)