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

Storage Subsystem Commands
SCF Reference Manual for the Storage Subsystem—529937-007
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CONTROL DISK Command
When you initiate a REPLACEBOOT operation, SCF puts one half of the mirrored
volume HARDDOWN before replacing the bootstrap file. The other half must be
STARTED.
If the specified bootstrap file and the processor type are incompatible, an error
message is generated and the operation is not performed.
During the REPLACEBOOT operation, the specified disk might not contain enough
space for the bootstrap program, or the currently allocated space might not be
enough for the new bootstrap program. If so, you must either compress disk space
using DCOM or delete extraneous files to provide enough space for the new
bootstrap program.
If an I/O failure or system failure occurs during the REPLACEBOOT operation, the
disk bootstrap program might no longer be valid and you would not be able to load
the system from that disk. If no other system disk has a valid bootstrap program,
contact your service provider.
To avoid this situation and aid recovery, follow the procedures described in
Replacing the Bootstrap Program on page 7-19, which describes how to handle
mirrored and nonmirrored disks while replacing the bootstrap program.
SPARE [ % | %H ] lsa [ , FORCED ]
(magnetic disks only) assigns an alternate sector to be used in place of a defective
sector and enters the address of the defective sector into the added defect map.
See the procedure for Sparing a Sector Manually
on page 7-15. Before sparing a
defective sector, verify the symptoms are not caused by a disk hardware problem.
CONTROL DISK Examples
•
To correct an error for the sector that begins at logical sector address %H57342:
-> CONTROL $DATA00, CHECKSUM %H57342
•
To rebuild the free-space table:
-> CONTROL $DATA01, REBUILDDFS
•
To replace the system bootstrap code on the primary half of $SYSTEM:
-> CONTROL $SYSTEM, REPLACEBOOT $SYSTEM.SYSnn.SYSDISC
[ % | %H ] lsa is the logical sector address for the spare operation.
This address can be expressed as an octal (%),
hexadecimal (%H), or decimal number. You can omit
leading zeroes.
FORCED specifies that the sector should be spared without
checking the condition of the sector.