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access method (SAM) files, however, can be relocated
to a different, single extent disk location on the target
device. In this case, the tcyl operand must be
supplied, but the device must not be a VM partial pack
minidisk. The proper label information (single
FORMAT-1 label) will be created and added to the
target VTOC. Processing multivolume files is the
responsibility of the operator, such that the SNAP
command should be repeated for all the source
volumes containing file extents. The number of
extents to be copied is limited by the limits existing for
the source device. Copying will be performed only if
the appropriate extent boundaries on the target device
are available or have already expired. Otherwise an
error message will be issued. Use the DDSR
command to delete the overlaid file and release the
space.
target The device ID (cuu) or the VOL1 label of the target device to
which the user wants the data to be copied. You must set the
target device DOWN (DVCDN command) before initiating the
SNAP function, unless the source and target devices are the
same device. If the target device is identified by its VOLID, it
must be either the only volume with that VOLID or the only
volume with that VOLID that is DOWN (DVCDN). Otherwise an
error message is issued. As many extents as allocated on the
source device will be used for file copying to the target device
(DSN=). Otherwise as many cylinders as specified for the
source device, or the entire source volume will be copied to
the target device. Relocation of data records will be assumed
if the specified cylinder range does not match the cylinder
range that was given for the source device. If the cylinder
range does not match the cylinder range of the source device
and the target device is a VM partial-pack minidisk, the
command will be rejected because VM uses virtual cylinder
values for partial-pack minidisks, and the cylinder ranges must
match for VM partial-pack minidisks. The source and the
target devices must be of the same type and must be in the
same RVA subsystem.
tcyl The decimal specification of where copying is to start
on the target device. Cylinder is the smallest entity
that can be specified for any SNAP command function.
The target cyl specification (tcyl) added to the
specified or calculated ncyl-1 value for the source
device is the resulting target end cylinder address and
must not exceed 32767 or the device′s primary
number of cylinders.
VOL1= Specifies the VOL1 label that the target device is to
receive after the source volume has been copied.
This operand is required if unique VOLIDs are to be
maintained. Otherwise the source and the target
devices would have the same VOL1 label after the
copy function has completed. The VOL1 label
specification for a target device is accepted only when
both the cyl and the DSN= specification have been
omitted, that is, for full volume snaps only.
44 RAMAC Virtual Array, Peer-to Peer Remote VSE/ESA