/POLICY=[NO]MINICOPY[=(OPTIONAL)], REQUIRE_MEMBERS,
[NO]VERIFY_LABEL
Controls the setup and use of shadow sets. For more information
about volume shadowing, see the VSI Volume Shadowing for OpenVMS.
The following table lists the keywords for this qualifier:
Keyword Description
[NO]MINICOPY Controls the setup and use of the shadowing
[=OPTIONAL] minicopy function.
(Alpha/Integrity
servers Requires LOG_IO (logical I/O) privilege to create
only) bitmaps.
The meaning of the keyword [NO]MINICOPY[=OPTIONAL]
for the MOUNT/POLICY qualifier depends on the
status of the shadow set, as follows:
1. If the shadow set is not mounted, either
on a standalone system or on any cluster
member, and MINICOPY=OPTIONAL is specified,
the shadow set is mounted and a write bitmap
is created. The write bitmap enables a
shadowing minicopy operation. You must specify
/MOUNT/POLICY=MINICOPY[=OPTIONAL] on the
initial mount of a shadow set, either on a
standalone system or in a cluster, to enable
the shadowing minicopy operation.
The OPTIONAL keyword allows the mount to
continue, even if the system was unable to
start the write bitmap. Likely reasons for the
bitmap to fail to start properly include an
improperly dismounted shadow set, a shadow set
that requires a merge operation, and various
resource problems. If the OPTIONAL keyword
is omitted and the system is unable to start
the write bitmap, the shadow set will not be
mounted.
If you specify the /POLICY=MINICOPY=OPTIONAL
qualifier and the shadow set was already
mounted on another node in the cluster without
the /POLICY=MINICOPY[=OPTIONAL], the MOUNT
command succeeds but a write bitmap is not
created.
If NOMINICOPY is specified, the shadow set is
mounted but a write bitmap is not created.
2. If a former member of the shadow set is
returned to the shadow set, which has
minicopy enabled, then a minicopy is started
instead of a full copy. This is the default
behavior and will occur even if you omit
/POLICY=MINICOPY[=OPTIONAL]. If a minicopy
is successfully started and then fails for some
reasons, a full copy is performed.
If a minicopy cannot be started and the keyword
OPTIONAL was omitted, the mount will fail.
If NOMINICOPY is specified, then no minicopy is
performed, even if one is possible.
REQUIRE_ Controls whether every physical device specified
MEMBERS with the /SHADOW qualifier must be accessible when
the MOUNT command is issued in order for the MOUNT
command to take effect. The proposed members are
either specified in the command line or found on
the disk by means of the /INCLUDE qualifier.
The behavior, without this qualifier, is that
if one or more members is not accessible for any
reason (such as a connectivity failure), then the
virtual unit will be created with the members that
are accessible.
This option is especially useful in the recovery
of disaster-tolerant clusters because it ensures
that the correct membership is selected after an
event.
[NO]VERIFY_ Require that any member that is going to be added
LABEL to the shadow set must have a volume label of
'SCRATCH_DISK'.
This will help insure that the wrong disk is not
added to a shadow set by mistake. If VERIFY_
LABEL is going to be used, then the disk that
is going to be added to the set must be either
initialized with the label 'SCRATCH_DISK' or a SET
VOLUME/LABEL must be performed.
The default behavior is NOVERIFY_LABEL, which
indicates that the volume label of the copy
targets will not be checked.