HP StorageWorks Data Replication Manager HSG80 ACS Version 8.7P Configuration Guide (AA-RPHZF-TE, March 2004)

Replicating Storage Units
220 Data Replication Manager HSG80 ACS Version 8.7P Configuration Guide
Snapshot Command
Note: This command is operational only in controller software versions 8.7S and 8.7P and is
operational only if both controllers have 512 MB of mirrored cache.
This command creates and names a snapshot unit. A snapshot unit is one that reflects the
contents of another unit at a specific time (the instant the ADD SNAPSHOT_UNITS command
is entered). The snapshot unit can then be presented to the host. The snapshot unit remains
until it is deleted (DELETE command).
Syntax
ADD SNAPSHOT_UNITS snapshot-unit storageset source-unit
Parameters
The following parameters are required for the ADD SNAPSHOT_UNITS command:
■ Snapshot unit
■ Storageset
■ Source unit
When the ADD SNAPSHOT_UNITS command is entered, storageset becomes snapshot-unit
and archives the current contents of source-unit at that instant.
These parameters are described in the paragraphs that follow.
snapshot-unit
The unit number assigned to the snapshot unit. The unit number must start with a letter (A
through Z) and may consist of a maximum of nine characters, including letters A through
Z, numerals 0 through 9, periods ( . ), dashes ( - ), and
underscores ( _ ).
Note: If you use scripting to automate failover and failback operations, do not use dashes
(hyphens) as separators in your naming convention—use underscores instead. Dashes are not
allowed by the Perl scripting language.
The snapshot unit is created with all host access disabled by default. Issue a SET
command to set up host access.
The snapshot unit is created on the same controller as the source unit and must remain
there.
storageset
Identifies the storageset that becomes the snapshot unit. The storageset must:
■ Have a capacity equal to or greater than the source unit
■ Be initialized
■ Not be a partition or a concatset