HP StorageWorks XP Remote Web Console Software - Manual (Page 34)

Table 17 Pool-VOL Requirements (continued)
Requirement Item
In addition, the volume already registered as a pool-VOL in a pool cannot be
registered in another pool. Also note that if you create pools for XP Thin Provisioning,
the number of available pools for XP Snapshot will decrease according to the
number of XP Thin Provisioning pools.
8 GB to 4 TB. Volume capacity
NOTE: Dividing a parity group into at least 16 is recommended for the best
performance.
Not required. Path definition
The volumes with path definition cannot be specified as a pool-VOL
XP Snapshot Software Requirements
To use XP Snapshot, all storage system hardware, microcode, and software required for XP Business
Copy operations must be installed and enabled. You also need to purchase the license key for XP
Business Copy and install it in Remote Web Console. For detailed information about the license
key and software installation, see the HP XP24000/XP20000 Remote Web Console User Guide.
Note that you must operate the Remote Web Console in modify mode to perform XP Snapshot
operations. Users in view mode can view XP Snapshot information, but they cannot create new
pairs or change the pair status. For information about how to set up and use the Remote Web
Console computer, see the HP XP24000/XP20000 Remote Web Console User Guide.
License Requirements
Capacity used by XP Snapshot will be subtracted from the licensed capacity for XP Business Copy.
Therefore, you need to ensure that the licensed capacity for XP Business Copy is larger than the
capacity to be used by both XP Business Copy and XP Snapshot.
Even when a volume is used for multiple purposes, only the capacity of this volume itself is added
to the total volume capacity; there is no need to multiply the capacity of this volume by the number
of purposes it is used for. For example, even if you share one volume as XP Snapshot P-VOL and
XP Business Copy P-VOL, only the capacity of the volume itself is added to the total volume capacity
and there is no need for it to be doubled.
Shared Memory Requirements
The shared memory for the differential table and the V-VOL management area must be installed
on the base board. Note that you cannot share the memory for the V-VOL management area with
the memory of XP Thin Provisioning.
Requirements for RAID Manager
To use RAID Manager for XP Snapshot operations, you need to have one volume for RAID Manager's
command device. For details about how to set the command device, see the HP XP RAID Manager
User Guide.
Operational Requirements
This section explains the information you need to know when you perform XP Snapshot operations.
Calculating the Maximum Number of Pairs
The number of XP Snapshot pairs that can be created for a storage system depends on the number
of differential tables, the capacity of shared memory for the V-VOL management area, or the
number of pair tables. Calculate the number of XP Snapshot pairs that can be created, first by
34 Preparing for XP Snapshot Operations