SCF Reference Manual for the Storage Subsystem (G06.24+, H06.03+)

Displaying Information About Magnetic Disks
SCF Reference Manual for the Storage Subsystem—529937-007
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Displaying Error and Current Status Information
Displaying Error and Current Status
Information
The STATUS DISK Command (page 14-139) displays the current status of a disk.
Displaying Disk Errors
1. Run DSAP on the suspected volume.
DSAP identifies unspared sectors: if an SCF INFO DISK, BAD command confirms
that sectors have not been spared, see Sparing a Defective Sector on page 7-14.
DSAP identifies doubly allocated file extents. See Correcting Doubly Allocated File
Extents on page 7-17.
2. Run these OSM or TSM actions to perform general tests and check for disk errors:
•
Test Verify
•
Validate Checksum
•
Alarms
Check these reports and resolve errors reported by OSM or TSM.
•
Use either the EMS Event Viewer to view messages from any log ($0, $ZLOG,
an alternate collector), including event logs saved on the server. You can also
download messages and save them in a file on the workstation.
3. If disk performance seems to be the source of problems:
•
Use DCOM to compress the free space of a disk volume to minimize file
fragments. See the Guardian Disk and Tape Utilities Reference Manual.
•
Use the Measure product to collect performance statistics on system
resources. You can use the data provided to balance work load and do
capacity planning. For detailed information, see the Measure Reference
Manual.
If, after resolving all errors, you want to rebuild the free space table on the disk,
see Correcting Doubly Allocated File Extents on page 7-17.
Displaying Bad Sector Information
If the disk is not installed or if it is in a state that prevents the system from getting the
information, SCF indicates that the information is not available.
Caution. This test can affect performance of the disk. Do not use this test when critical
applications are using the disk.