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Transferring volumes Appendix
12.3 Transferring volumes
12.3.1 Introduction
A transfer enables LVs to be exported from a CentricStor system and imported into another
CentricStor.
For the export these LVs are temporarily copied into the special LV group TR-LVG using
“plmcmd trans …” commands and saved on PVs of the special PV group TR-PVG.
These PVs can then be removed and transported to another CentricStor.
For importing these PVs can be included in the TR-PVG and the LVs contained there can
be read into CentricStor using “plmcmd trans …” commands.
For this purpose one LVG group and one PVG group, named TR-LVG and TR-PVG respec-
tively, are available in CentricStor which are statically linked. The connection cannot be
canceled. The TR-PVG cannot be assigned to any other LVG.
Both groups are additive, i.e. 100 PV and 512 LV groups are still freely available (not
counting BASE). They are used for the temporary addition of the logical and physical
volumes during the export and import.
These two groups cannot be reached or administered via the GUI; PVs must therefore be
added or removed via the CLI.
To add: plmif conf -a -V <PV> -t <type> -G TR-PVG [-l <loop>]
To remove: plmif conf -e -V <PV> [-l <loop>]
The following must be entered for <type>:
3580 for LTO drives
3590 for Magstar and Eagle drives
Volume export and import is a solution which runs only within CentricStor.
It is not controlled by the tape management tools on the hosts via the commands which a
DAS server provides with dasadmin eject / insert ... or an ACSLS server with
eject / enter ... . These commands are not currently supported by the VDAS and
VACS in CentricStor.
This solution is specially designed for the transfer of logical volumes from one CentricStor
system to another CentricStor system, i.e. export in system 1 and import in system 2.
To handle large quantities of data, the copying operation of the LVs can take place in parallel
on multiple physical disk servers (PDSs).
The transfer operation and the next backup to the same LVs may not overlap.