|
One uses shadowing itself to create the backup, not the standalone
BACKUP (OpenVMS VAX) or CD-ROM BACKUP (OpenVMS Alpha) utility.
Add a scratch volume into the shadowset, and allow the shadow merge
operation to complete.
You will want to acquire a copy of the shadowing manual, either as
hardcopy or as part of the OpenVMS online documentation CD-ROM set.
-- from the shadowing manual --
7.3.1 Restrictions on BACKUP Procedures
On VAX systems, Digital does not support accessing of
shadow sets from standalone BACKUP. The command pro-
cedures supplied by Digital for building standalone BACKUP
kits make every effort to prevent standalone BACKUP from
using volume shadowing improperly. However, these checks
can easily be overridden by a well-informed and sufficiently
privileged user.
Note the following restrictions for standalone BACKUP on
VAX systems that use volume shadowing:
� Do not boot standalone BACKUP from an alternative root
on a shadowed system disk while other nodes are booting
from the same shadowed system disk. If you do this, the
boot attempt will fail.
� Standalone BACKUP does not mount virtual units. This
makes access to virtual units impossible from standalone
BACKUP.
� Do not assume that standalone BACKUP prevents you
from accessing a shadow set member unit. You must
prevent standalone BACKUP from sending output to a
disk mounted on any other VMScluster member, either
as a directly accessible disk or as the member of a shadow
from accessing a shadow set member unit. You must
prevent standalone BACKUP from sending output to a
disk mounted on any other VMScluster member, either
as a directly accessible disk or as the member of a shadow
set.�
On AXP computers, the same restrictions apply. You cannot
use the standalone, menu-driven procedure included on the
OpenVMS AXP operating system distribution compact disc to
perform BACKUP operations on shadow sets. �
7.3.2 Using Copy Operations to Create a Backup
This example shows how to use volume shadowing copy op-
erations to create an offline identical disk volume that you
can then use as a backup of your shadow set. The following
command creates a shadow set with one shadow set member:
$ MOUNT/SYSTEM DSA0:/SHADOW=$1$DUA10: SHADOWFACTS
%MOUNT-I-MOUNTED, SHADOWFACTS mounted on _DSA0:
%MOUNT-I-SHDWMEMSUCC, _$1$DUA10: (DISK01) is now a
valid member of the shadow set
The following command adds a second member, $1$DUA11,
to the shadow set:
$ MOUNT/SYSTEM DSA0:/SHADOW=$1$DUA11: SHADOWFACTS
%MOUNT-I-SHDWMEMCOPY, _$1$DUA11: (DISK02) added to the shadow
set with a copy operation
At this point you must wait for the copy operation to complete
before dismounting the shadow set. When the copy operation
is complete, messages are sent to the system console and to
any operators enabled to receive them.
The following command dismounts the shadow set, leaving
$1$DUA10 and $1$DUA11 with logically identical volumes:
$ DISMOUNT DSA0:
At this point you can re-create the shadow set with one of
the volumes and keep the other as a backup, or use it as a
source for the backup operation.
|