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

[ , REFRESH ]
[ , REPLACEBOOT [[$vol.]subvol.]fileid ]
[ , SPARE [ % | %H ] lsa [ , FORCED ] ]
CHECKSUM [s% | %H ] lsa
(physical disks only) reads the specified sector, recomputes the sector checksum value for
specified portions of a disk volume, and writes the sector back to disk again. (By comparison,
FUP CHECKSUM recomputes the block checksum.) CHECKSUM corrects the checksum value
for a disk address, even if the address is not within a file. This attribute is normally used only
by a service provider
Is the logical sector address of the first sector of the disk portion whose checksum is
to be calculated. The logical sector address can be expressed as an octal (%),
hexadecimal (%H), or decimal number.
[ % | %H ] lsa
Close all files, but leave the disk in the started state, before you issue this command. Because
the checksum operation can leave data on the volume in an inconsistent state, SCF asks you
to verify the request. Report the original error message (that prompted you to use the checksum
operation) to your service provider.
POWER { ON | OFF }
powers a disk drive on or off. Specifying ON powers the disk drive on. Specifying OFF powers
the disk drive off. All paths to the disk drive (-P and -B or -M and -MB) must be in a STOPPED
state before you can use this command option. When you use this attribute, you can specify
only the -P path or the-M path
NOTE: You cannot turn the power on or off for M8xxx disks using this attribute.
POWEROFF
powers the disk drive off. All paths to the disk drive (-P and -B or --M and -MB) must be in a
STOPPED state before you can use this command option. When you use this attribute, you can
specify only the -P path or the-M path
NOTE: You cannot turn the power off for M8xxx disks with this attribute.
POWERON
powers the disk drive on. All paths for the disk drive (-P and -B or -M and -MB) must be in a
STOPPED state before you can use this command option. When you use this attribute, you can
specify only the -P path or the-M path.
NOTE: You cannot turn the power on for M8xxx disks with this attribute.
REBUILDDFS
(physical disks only) rebuilds the disk free-space table.
REFRESH
(physical disks only) writes to disk the dirty (changed) cache pages for nonaudited files and
dirty file control blocks. You should issue a CONTROL DISK, REFRESH command before:
• Shutting the system down.
• Backing up open disk files to tape (when the application must be kept running). Do a
refresh when no transactions are taking place on the system. When the files are backed
up, the file labels more accurately represent the state of the files that are backed up. Back
up audited files with the TMF Online Dump to ensure data consistency.
The time a refresh operation takes depends on the amount of disk cache containing dirty pages
in use at the time. Writing to disk can take several minutes. During this time all other disk I/O
CONTROL Command 245