NonStop Operations Guide for H-Series and J-Series RVUs

Table 29 Common Recovery Operations for Disk Drives (continued)
RecoveryProblem
If you are authorized, use the SCF CONTROL DISK, SPARE
command to spare defective sectors. For information on
Defective sectors
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.
To check for unspared defective sectors with SCF:-> INFO
DISK $*, BAD, SEL started, sub magneticTo check for
Unspared defective sectors
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.
“Recovery Operations for a Nearly Full Database File”
(page 153).
Nearly full database file
Performance problems can have various causes, including
path switches or a cache size that is too small. For
Performance problems
information about disk load balancing and increasing
cache size, see the SCF Reference Manual for the Storage
Subsystem.
If both halves of your mirrored system volume become
corrupted, use an alternate system disk if one is available.
Corrupt $SYSTEM disk
For how to create an alternate system disk, see the
Installation Guide for your NonStop system.
• For internal SCSI disk drives: if there is no alternate
system disk and you cannot load from the CONFBASE
file, you might be able to perform a tape load from a
system image tape (SIT) to restore the system image files
to the $SYSTEM disk (SYSnn and CSSnn subvolumes).
Then load that image into processor 0 or 1.
A tape load reinitializes the disk directory. The disk
directory is overlaid with the directory from the tape.
All files on that disk are destroyed. Perform a tape load
only with the advice of the Global NonStop Support
Center (GNSC) or your service provider.
• For M8xxx disk drives: you cannot perform a tape load
from a SIT.
Failed disk drives
• Internal SCSI disks: the “Support and Service Collection”
(page 31) describes replacing disk drives.
• M8xxx fibre channel disks: these disks are FRUs and
can be serviced or replaced only by HP-trained service
personnel.
Recovery Operations for a Down Disk or Down Disk Path
To restart a disk or disk path:
152 Disk Drives: Monitoring and Recovery