Fujitsu Siemens Computers pmn User Manual page 180

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The settings for the cache file system can be modified later at any time. After a modification
a "Distribute and Activate" operation is required in which, however, only the VLM and the
PLM must be restarted if this was the only change.
If assignments between cache file systems and LV groups are modified, this can result in
certain logical volumes having to be moved from one cache file system to another because
the old assignment no longer applies. This operation is performed automatically by the
system.
Examples
– An LV group is subsequently assigned to a cache file system which has so far not been
used exclusively:
All logical volumes which were contained in this file system but did not belong to the
assigned LV group must be moved to other file systems. Furthermore, any existing
logical volumes of the exclusively assigned LV group must now be moved into this cache
file system.
– The assignment of an LV group to a cache file system is changed, i.e. it is assigned to
another cache file system:
All logical volumes of this LV group must be moved into the other cache file system. It
may be necessary to remove logical volumes which do not belong to the assigned LV
group from this cache file system.
– The assignment of an LV group to a cache file system is canceled:
If further LV groups are assigned to this cache file system, the logical volumes of the LV
group whose assignment has been canceled must be moved to other cache file
systems.
Logical volumes are moved automatically in the background. The following points must be
noted here:
– It can take several minutes before the logical volumes have reached their destination
and the operation is terminated.
– Logical volumes which are currently in use cannot be moved (mounted volumes,
volumes which are currently required for reorganizing physical volumes). The move
takes place when the volumes are no longer being used.
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