HP 3000 Manuals HP 3000 Manuals
Restoring Files from Magneto-Optical Disk
Specifying the DASS Device
When restoring from a DASS device, you do not use file equations as you
do when using tape drives. Nor do you use the RESTORESET parameter to
backreference the device. Instead, you specify that the restore is to be
from the Model 20GB/A through the MOSET parameter of the RESTORE command.
Specify the LDEV number of the DASS device as a parameter to MOSET. For
example,
;MOSET=(101)
Specifying the Backup Name
The backup name you specified with the STORE command is required when
restoring from the DASS device. Use the NAME parameter to indicate the
logical backup name from which the restore is to be done. For example,
;NAME=BK1130PM.D23OCT90.KING
If the backup media is not loaded in the DASS device at the time the
restore is started, you are prompted to mount the media. For example,
23:24/#S1/51/MOUNT THE MEDIA LABELLED BK1130PM.D23OCT90.KING IN THE MAILSLOT OF LDEV 101 (Y/N)?
After you load the correct media in the DASS device, reply to the
message.
Restoring from a Single DASS Device
The following example illustrates the RESTORE command to restore files
from a single DASS device with the LDEV number 101.
RESTORE; @.@.@;MOSET=(101);NAME=BK1130PM.D23OCT90.KING
Restoring from Multiple DASS Devices
Multiple DASS devices can be used in parallel (sequential use is not
recommended) for restores by specifying each DASS device drive with the
MOSET parameter. For example, to use LDEV 102 and 103 in parallel, the
MOSET entry would be:
;MOSET=(102),(103)
If you used multiple DASS devices for your store, then you should use the
same devices for the restore to avoid media movement. For example, if
you stored to LDEV 102 and 103 and you restored from 102, you would have
to remove the media from LDEV 103 and load to 102.
Restoring from Sequential DASS Devices.
NOTE Restoring from sequential DASS devices is not recommended.
The following example illustrates the RESTORE command entry to use two
DASS devices sequentially.
RESTORE @.@.@;;MOSET=(101,102);NAME=BK1130PM.D23OCT90.KING
With this usage, only one drive will be active restoring at any given
time while the other drive is swapping media. Since the swap time for
media is very short, this method is not an efficient use of the two DASS
devices.
Restoring from Parallel DASS Devices.
Restoring from parallel DASS devices is the recommended method of using
multiple DASS devices. The following example illustrates the RESTORE
command entry to use two DASS devices in parallel.
RESTORE @.@.@;;MOSET=(101),(102);NAME=;NAME=BK1130PM.D23OCT90.KING
With this usage, both drives will be active restoring simultaneously.
NOTE If both drives are on the same autochanger, the action of one drive
will affect the other. For example if a mount request is issued
for LDEV 101, the use of LDEV 102 is blocked while waiting for the
reply to the mount request for LDEV 101.
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