SCF Reference Manual for the Storage Subsystem (G06.28+, H06.05+, J06.03+)

is suspended, which means that applications can time out waiting for the refresh operation to
finish.
REPLACEBOOT $SYSTEM.SYSnn.SYSDISC
(physical disks only) replaces the disk system-load bootstrap program.
$SYSTEM.SYSnn.SYSDISC is the location of the disk bootstrap program. SCF creates the
temporary work file ZSYSDISC.ZSCFDISC during the REPLACEBOOT operation, installs the
bootstrap program in a reserved area, and when the operation is finished, purges the
ZSYSDISC.ZSCFDISC file.
When you use this attribute, you cannot specify a path.
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” (page 107), which describes how to handle mirrored and nonmirrored disks
while replacing the bootstrap program.
NOTE: The REPLACEBOOT attribute does not apply to Integrity NonStop NS-series servers.
Instead, the bootstrap program is installed through firmware update into flash memory.
SPARE [ % | %H ] lsa [ , FORCED ]
(physical 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
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.
[ % | %H ] lsa
specifies that the sector should be spared without checking the condition of
the sector.
FORCED
See the procedure for “Sparing a Sector Manually” (page 105). 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
• To spare the sector that has logical sector address %H0000795C on the mirror half of a
volume:
-> CONTROL $DATA01-M, SPARE %H795C
246 Storage Subsystem Commands