After you define a storage pool, you can change the collocation
setting by updating the storage pool. The change in collocation for
the pool does not affect files that are already stored in the pool.
For example, if collocation is off for a storage pool and you turn
it on,
from then on client files stored in the pool are collocated.
Files that had previously been stored in the pool are
not moved
to collocate them. As volumes are reclaimed, however, the data in
the pool tends to become more collocated. You can also use the MOVE
DATA or MOVE NODEDATA commands to move data to new volumes to increase
collocation. However, this causes an increase in the processing time
and the volume mount activity.
Remember: A mount wait
can occur or increase when collocation by file space is enabled and
a node has a volume containing multiple file spaces. If a volume is
eligible to receive data, Tivoli® Storage
Manager will wait
for that volume.