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

Storage Subsystem Commands
SCF Reference Manual for the Storage Subsystem—529937-007
14-61
ALTER DISK Command
MBACKUPSAC { number | name }
(mirrored 45xx and mirrored M8xxx disks only) is the SAC that controls the mirror
backup path to the disk.
MIRRORDEVICEID { number | ( shelf,bay ) }
(mirrored 45xx and mirrored M8xxx disks only) is the device ID of the disk
accessed on the mirror path to the disk.
For 45xx disks:
For M8xxx Fibre Channel disks in a disk-drive enclosure:
If you configure a disk volume for use with an FCSA connected to an ESS, you
cannot specify MIRRORDEVICEID.
MIRRORLOCATION ( group, module, slot )
for internal disks, is the location of the mirror half of the disk volume. For 45xx,
ESS, and M8xxx disks, is the location of the adapter that controls the mirror path to
the disk.
This attribute is optional if MIRRORSAC (page 14-62) is given in name format but
required if given in number format.
MIRRORLOCATION can be altered when all paths to the volume are in the
STOPPED state.
MIRRORLOCATION can also be altered when all configured paths to the primary
drive are in STARTED state and MIRRORLOCATION is not yet configured. The
result of an online reconfiguration must be symmetrical. If the volume has a
BACKUP path, it must also have a MBACKUP path.
You cannot change the value of this attribute by using the ALTER command online
after setting it (using either the ADD or ALTER command). To change the value
online, you must delete, respecify the mirror location.
number Is the SAC subdevice number on the adapter.
If you specify MBACKUPSAC in number format, you must also
specify MBACKUPLOCATION.
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
number
Is the unit number of the disk. number is in the range 1
through 7.
shelf Is the disk-drive enclosure’s shelf number. shelf is in the
range 1 through 4.
bay Is the number of the disk. bay is in the range 1 through 14.