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

DISK AUTOSTART ON is ignored if SUBSYS AUTOSTART is OFF.
For information about using this attribute, see “Mirrored Disk Placement” (page 77).
BULKIO { ON | OFF }
specifies whether the S-series system allows direct bulk I/O operations. The default is ON.
Direct bulk I/O starts automatically and is transparent to all applications. It improves system
performance during disk and tape bulk data transfers. By using direct bulk I/O, data can be
transferred directly over ServerNet paths between an application data buffer (in any processor)
and the storage controller under direction from the controlling IOP that is running in the same
or a different processor.
Without direct bulk I/O, application data flows through an intermediate buffer in the processor
of the controlling IOP. This path might take longer to transfer bulk data.
The BULKIO attribute applies only to S-series systems. You cannot set it to ON in HP Integrity
NonStop systems or HP Integrity BladeSystems . If you set it to ON, the command will fail and
the value in the CONFIG file will remain BULKIO OFF.
LABELTAPE { ON | OFF }
specifies whether the system allows labeled-tape processing. The default is OFF. When you
enable or disable labeled-tape processing, you must:
• Manually manage the tape server process $ZSVR.
• First stop all tape drives.
See the procedure for “Enabling or Disabling Labeled-Tape Processing” (page 188).
UPS { ON | OFF }
specifies whether all disk devices are powered by uninterruptible power supplies. If ON, all
disk devices must be powered by one or more uninterruptible power supplies. The default of
this attribute is determined by the value of the DP2_UPSOPTION flag from the system globals.
ALTER SUBSYS Examples
• To set BULKIO on:
-> ALTER $ZZSTO, BULKIO ON
• To turn on labeled-tape processing:
-> ALTER $ZZSTO, LABELTAPE ON
• To make internal disks plug and play:
-> ALTER $ZZSTO, AUTOCONFIGURE ON, AUTOSTART ON, &
-> AUTOREVIVE ON
See “Automating Disk Configuration” (page 73).
ALTER TAPE Command
The ALTER TAPE command changes the configured attribute values for a tape device attached to
your system. The syntax is:
ALTER [ / OUT file-spec / ] TAPE $tape
[ , LIKE object ] [ , attribute-spec ]...
Wild-card characters are supported.
OUT file-spec
directs all SCF output to the specified file.
TAPE $tape
is the name of the tape device.
ALTER Command 241