RDF/IMP and IMPX System Management Manual (RDF 1.4+)

Preparing the RDF Environment
HP NonStop RDF/IMP and IMPX System Management Manual—524388-001
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Configuring an SMF Environment on the Backup
RDF System
updaters and each updater only being able to work on a maximum of 15 physical
volumes.
3. Image trail volumes cannot reside on SMF logical volumes.
4. An SMF logical volume cannot be used as the RDF BACKUPSWAP volume.
There are no restrictions on the placement of SMF catalog files on the backup system.
If the backup system could ever become a primary (such as after an RDF takeover, for
example, or as the result of a planned switchover), then the restrictions described in
the preceding topic for primary systems also apply.
RDF replicates Enscribe file creations when audited Enscribe files are created on RDF
protected volumes. When the UPDATEVOLUME is a virtual disk, the updater process
tells SMF to create the file and register it in the SMF catalog. When the
UPDATEVOLUME is a virtual disk comprised of multiple physical disks, SMF decides
which physical disk will store the file. You have no control over where a new Enscribe
file is created. Refer to the HP NonStop Storage Management Foundation (SMF)
Management Manual for further information about the factors SMF uses to decide on
the file placement.
You can change the physical volume on which files reside in the SMF pool using the
FUP RELOCATE command. This command only works on closed files, so the updaters
must be stopped before relocating any files.
SMF allows physical disks to be added and removed from pools. The RDF updaters
must be stopped prior to the addition or deletion of any physical disks from SMF pools
on the backup system.
Note. A single updater process only works on 500 files at any time. If you have a virtual disk
that has many physical disks in its pool, and if the number of files that need to be updated by
the updater assigned to that virtual disk exceeds 500, the updater will close some files in order
to work on files it does not already have open. If this updater must regularly work on more than
500 files, the performance of the updater is impacted. For optimal updater performance,
ensure that no single updater must work on more than 500 files on a regular basis. This
condition might mean that you have to reduce the number of physical disks in a pool.