TMF Operations and Recovery Guide (G06.24+)
Recovery Methods
HP NonStop TMF Operations and Recovery Guide—522417-002
7-6
Volume Recovery Example
Volume Recovery Example
The following volume recovery example applies to situations in which TMF is in the
started state.
If you need to restart several data volumes that are down, and you know that volume
recovery will take a long time to run (because there was significant transaction activity
or audit record generation during or after the time these volumes went down), consider
using the DISABLE DATAVOLS command to disable the volumes before bringing them
up. Then enable the volumes, which will cause volume recovery to run and start the
volumes for TMF processing. For example:
24> TMFCOM
.
.
.
TMF 1> DISABLE DATAVOLS ($DATA1, $DATA2, $DATA4, $DATA8)
$DATA1 -- disabling datavol.
$DATA2 -- disabling datavol.
$DATA4 -- disabling datavol.
$DATA8 -- disabling datavol.
TMF 2> EXIT
25> SCF START DISK $DATA1
26> SCF START DISK $DATA2
27> SCF START DISK $DATA4
28> SCF START DISK $DATA8
29> TMFCOM
.
.
.
TMF 1> ENABLE DATAVOLS *
$DATA1 -- enabled.
$DATA2 -- enabled.
$DATA4 -- enabled.
$DATA8 -- enabled.
Using this procedure may greatly improve the efficiency of the volume recovery
process for a group of volumes that require extensive recovery. If you bring up the
volumes without first disabling them, multiple volume recovery processes may be
started successively. Any volumes not recognized by the first volume recovery
process will experience a significant delay before the next volume recovery process
can begin.
Disabling data volumes may also improve volume recovery efficiency during processor
reload situations and for those volumes affected by SCF START DISK commands. A
processor reload brings up a set of volumes if the processor is the first of the pair for
the volumes. If multiple processors are reloaded, it is possible that TMF will detect
multiple sets of volumes being brought up: this situation would cause multiple volume
recovery runs. (The SCF START DISK command is described in the SCF Reference
Manual for G-Series RVUs.)