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

Storage Subsystem Commands
SCF Reference Manual for the Storage Subsystem—529937-007
14-12
ADD DISK Command
BACKUPPORTNAME number
specifies the Fibre Channel port name (WWN) used by the backup path to a disk
on an Enterprise Storage System (ESS).
The ESS administrator must give you the WWN so that you can specify it in this
attribute
Enter number as a 16 character hexadecimal number, without a leading %H.
BACKUPSAC { number | name }
is the SAC that controls the backup path to the device.
CACHE { ( block-size, num-blocks ) |
( ( block-size, num-blocks ),
( block-size, num-blocks ) ) }
specifies the disk cache configuration for an in-use volume. Disk cache
configuration is the number and size of sectors read from disk and stored in the
processor for use as virtual memory. If you do not specify a value, SCF uses
values set by the disk process, which might cause performance problems.
Before using this attribute, see Considerations for ALTER DISK, CACHE and
Magnetic Disks on page 6-23.
number is the SAC subdevice number on the adapter.
If you specify BACKUPSAC in number format, you must also specify
BACKUPLOCATION.
name is the full name of the SAC location. For example:
SNDA.SAC-1.GRP-1.MOD-1.SLOT-53
FCSA.SAC-1.GRP-11.MOD-2.SLOT-5
Use this form to override the default selection of which adapter gets
the -P path and which gets the -B path.
block-size is a sector size in bytes or kilobytes:
512 or .5K
1024 or 1K
2048 or 2K
4096 or 4K
num-blocks is the number of blocks to be allocated in cache. The maximum
number of blocks is 2,097,152 regardless of block-size. The
minimum number of blocks is 18 multiplied by the number of disk
processes configured for the volume. Use the INFO DISK,
CONFIG command to display this value in the
NumDiskProcesses field.