NonStop S-Series Operations Guide (G06.27+)

Disk Drives: Monitoring and Recovery
HP NonStop S-Series Operations Guide—522459-008
9-14
Recovery Operations for Disk Drives
Disk full 1. Use DSAP to identify large, old, and little used files.
2. If you are authorized:
•
Use the BACKUP utility to back up these disk files to tape and then
purge them from the disk. Do not purge important system files.
•
Move files to another disk. Do not move important system files.
•
Ask users to purge files.
For more information about these utilities, see BACKUP
on page B-2 and
Disk Space Analysis Program (DSAP) on page B-2.
Down disk or
disk path
See Recovery Operations for a Down Disk or Down Disk Path
on
page 9-15.
Defective sec-
tors
If you are authorized, use the SCF CONTROL DISK, SPARE command to
spare defective sectors. For information on reinitializing the disk drive, see
the SCF Reference Manual for the Storage Subsystem.
Disks come formatted from HP. No disk format utility is available. Return
any disk that requires formatting to HP.
Unspared
defective sec-
tors
To check for unspared defective sectors with SCF:
-> INFO DISK $*, BAD, SEL started, sub magnetic
To check for unspared defective sectors with DSAP, at a TACL prompt:
> DSAP $*
•
Recovery for DSAP is not needed.
•
Recovery for DCOM: use the SCF INFO DISK, BAD command on the
affected disk to obtain the bad sector address. Before restarting
DCOM, perform the CONTROL DISK, SPARE command.
For more information, see the Guardian Disk and Tape Utilities Manual.
Nearly full
database file
Recovery Operations for a Nearly Full Database File
on page 9-16
Performance
problems
Performance problems can have various causes, including path switches
or a cache size that is too small.
For information about disk load balancing and increasing cache size, see
the SCF Reference Manual for the Storage Subsystem.
Table 9-3. Common Recovery Operations for Disk Drives (page 2 of 3)
Problem Recovery