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Tech Note #: 9202
Date: August 7,1992
Subject: Restoring Data from a Down Volume
Keywords: Restore
Network Archivist Version: 2.0d, 2.0e, 2.0f
NetWare Version: 2.x, 3.x
Who Should Read This Tech Note?
Anyone who uses or supports the Network Archivist and must
restore data from tape from a volume that is no longer
accessible.
Introduction
The Network Archivist uses databases to quickly and easily
restore data from tape. These "file history" databases keep
track of all files stored in the tape library and are located
on each volume protected by the Network Archivist. When a
volume is down or otherwise unavailable, the databases
corresponding to that volume are also unavailable, making it
difficult to restore data from that volume using the Network
Archivist menus.
To restore data from volumes that are temporarily down,
permanently removed from the network, or eliminated after
volume consolidation, it is necessary to first restore their
file history databases (seven AV*.PAC files) from tape to
some other volume on the network.
WARNING: If the target volume is currently protected by the
Network Archivist, the existing AV*.PAC files in the \TNA
directory should first be renamed to AV*.SAV (for example) so
they can be restored after you are finished restoring data
from the downed volume.
WARNING: Do not run any backup operation before restoring
the original AV*.PAC files that were renamed earlier in the
process.
If the volume to be restored is the TNA install volume, a
temporary TNA installation must first be created on a target
volume using the control database restored from the last
successful backup tape in the tape library. See the tech note
"Temporary Installations" for details on this procedure.
Restoring File History Databases
The following command will restore the file history databases
for OLD_S/OLD_V from tape and redirect them to NEW_S/NEW_V,
where OLD_S/OLD_V and NEW_S/NEW_V are server names/volume
names.
Mount the last tape used to backup OLD_S/OLD_V and at the DOS
prompt, type:
TNA2DISK /RH=NEW_S/NEW_V: /L"LABEL" [/DCP#] OLD_S/OLD_V:
Where:
NEW_S/NEW_V: is the target server/volume name OLD_S/OLD_V: is
the down server/volume name "LABEL" is the label of the
mounted tape (e.g. /L"BACKUP_A1") /DCP# is an optional
checkpoint file set specifier (e.g. /DCP132)
If a checkpoint file set is not specified with the /DCP#
switch, the most recent checkpoint file set for the down
server/volume on the mounted tape will be used. Checkpoint
file sets can be examined using tape journals and are
identified by the letters "CP" followed by a number (e.g.
CP96 is checkpoint set #96).
If the AV*.PAC files are being redirected to a volume not
currently protected by the Network Archivist, be sure to add
that volume to the protect volume list after restoring the
AV*.PACs to that volume.
It is recommended that the file history database be verified
using TNARECOV following the database recovery from tape.
This is especially important when the volume has been skipped
for one or more rotations.
Restoring Data
After the file history databases have been restored, data
from the down volume can be restored or redirected through
the new volume using the Network Archivist's menus. The
directories and files the Network Archivist reads from the
file history database are displayed as deleted directories
and files.
Restoring To the Local Drive
If the workstation that runs the backups has a C: drive, the
AV*.PAC files can be restored to this drive as easily as any
other by simply using C: as the new server/volume name. Then
add C: to the protect volume list if it is not currently
protected by the Network Archivist.
Examples
The following command will restore the AV*.PAC files for
FS1/SYS and redirect them to FS2/VOL1 using the TAPE_B1 tape,
identified as the last tape to perform a backup on FS1/SYS:
TNA2DISK /RH=FS2/VOL1: /LTAPE_B1 FS1/SYS:
The following command will restore the AV*.PAC files for
FS1/SYS and redirect them to the local drive C: using the
CP37 file set (identified in the tape journal) on tape
BACKUP_C3:
TNA2DISK /RH=C: /LBACKUP_C3 /DCP37 FS1/SYS: