HSG80 Enterprise/Modular Storage RAID Array Fibre Channel Solution Software V8.7A for Windows Release Notes (AA-RH0QL-TE, July 2003)

ACS Feature Support
41Release Notes – HSG80 Enterprise/Modular Storage RAID Array Fibre Channel Solution
Software Version 8.7A for Windows
To verify the correct version of ACS on the HSG80 array controller in this scenario,
always use the SHOW THIS_CONTROLLER or SHOW OTHER_CONTROLLER CLI
command from a CLI window or any CLI prompt.
Disk Partitioning
ACS allows partitioning of disk drives or storagesets for improved device
management. A partition appears to the operating system as a single virtual disk. Up
to eight partitions may be created per storageset or disk drive. Disk partitioning is
supported under all failover modes supported by your operating system.
SNAPSHOT
ACS with SNAPSHOT capability provides a quick and efficient way to make a
point-in-time copy of a storage container’s data. SNAPSHOT freezes a map of the
container’s data, which can be separated and used for backup or testing and
manipulation without having an impact on the original data. After the SNAPSHOT,
the original data can continue to be updated and utilized while the SNAPSHOT copy
remains unchanged.
When the need for the duplicate copy of data has ended, a new snap of a different
storage container can be made and the process repeated. SNAPSHOT eliminates much
of the overhead associated with mirroring and cloning since the SNAPSHOT is
dissolved without having to re-merge the data.
SNAPSHOT is enabled when the following CLI command is entered:
HSG80> ADD SNAPSHOT_UNITS
See the HSG80 Array Controller ACS Version 8.7 CLI Reference Guide for additional
syntax details.
The SNAPSHOT unit can be presented to the host. The SNAPSHOT unit remains
until it is deleted.
NOTE: SNAPSHOT functionality requires either ACS Version 8.7P or ACS Version 8.7S.
IMPORTANT: ACS SNAPSHOT capability requires 512 MB of cache memory.
Write History Logging
Write history logging, available to users of ACS Version 8.7P, uses a log unit to log a
history of write commands and data from the host on the initiator side in either of the
following situations:
• The target is inaccessible.