SCF Reference Manual for the Storage Subsystem (G06.27+, H06.04+)

Storage Subsystem Commands
SCF Reference Manual for the Storage Subsystem—529937-008
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ALTER SUBSYS Command
For information about using this attribute, see Configuring Internal Mirrored
Magnetic Disks to Revive Automatically on page 6-13.
AUTOSTART { ON | OFF }
(internal and M8xxx disks only) specifies whether to automatically start the disk
process when the disk is inserted.
DISK AUTOSTART ON is ignored if SUBSYS AUTOSTART is OFF.
For information about using this attribute, see Mirrored Disk Placement on
page 6-12.
BULKIO { ON | OFF }
specifies whether the 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,
but the advantage in using direct bulk I/O is that the processor of the controlling
IOP is freed to perform other operations.
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 on
page 13-13.
UPS { ON | OFF }
specifies whether the system performs special disk processing in the event of a
power failure. 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.
ON Enable automatic starting (default).
OFF Disable automatic starting.