Examples show how the simultaneous-write function
works
during client store operations. In all the examples, client nodes,
whose files require fast restore, are members of a policy domain that
specifies an active-data pool.
For these examples, assume
the following conditions:
- Primary storage pools DISKPOOL and
TAPEPOOL are linked to form
a storage hierarchy. DISKPOOL is at the top of the storage hierarchy
and TAPEPOOL is the next pool in the storage hierarchy.
- The
value of the AUTOCOPY parameter
for DISKPOOL is CLIENT. The value of the AUTOCOPY parameter
for TAPEPOOL is NONE.
- The active backup data belonging to
certain clients must be restored
as quickly as possible if a disaster occurs. These clients are members
of policy domain FASTRESTORE, which specifies an active-data pool
as the destination for active backup data. Files A and B belong to
a node in this domain and are bound to management class STANDARD.
The destination specified in its backup copy group is DISKPOOL.
- The
data belonging to other nodes is less critical. Restore times
are flexible. These nodes are assigned to policy domain NORMAL, which
does not have an active-data pool specified. Files C, D, and E belong
to one of the nodes in this domain and are bound to management class
STANDARD. The destination that is specified in its backup
copy group is DISKPOOL.
- DISKPOOL has enough space to store
only files C and D, but its
next pool (TAPEPOOL) has enough space for file E.