HP StorageWorks XP Remote Web Console Software - Manual (Page 40)

In case of an L1 pair, you can use 0, 1 or 2 as an MU number. In case of an L2 pair, you
can use 1 or 2 as an MU number.
• Number of S-VOLs per one P-VOL
You can assign up to three S-VOLs to one P-VOL when creating an L1 pair. When creating an
L2 pair (leaf pair), you can assign up to two S-VOLs to one P-VOL. However, you cannot assign
two or more P-VOLs to one S-VOL.
• Maximum number of pairs
Up to 16,384 Business Copy pairs can be created (when P-VOLs and S-VOLs are in a one-to-one
relationship). If the LUSE volumes are included in Business Copy pairs, the maximum number of
pairs decreases.
Even if the above requirements are fulfilled, the following volumes cannot be used for creating Business
Copy pairs.
• Journal volumes of Continuous Access Journal
• Virtual volumes (except XP Thin Provisioning volumes)
• Pool volumes
For details about combining volume of XP Snapshot pair and volume of Business Copy pair, see the HP
StorageWorks XP24000 Snapshot User’s Guide.
Business Copy Software Requirements
To use Business Copy, all storage system hardware, microcode, and software required for Business
Copy operations must be installed and enabled. You also need to purchase a license key for Business
Copy and install it on the storage system. For detailed information about the license key and software
installation, see the HP StorageWorks XP24000 Remote Web Console User’s Guide.
Note that you must operate the Remote Web Console in modify mode to perform Business Copy
operations. Users in view mode can only view Business Copy 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 StorageWorks XP24000 Remote Web Console User’s Guide.
License Requirements
Business Copy license capacity will be required for Business Copy P-VOLs, S-VOLs, and reserved volumes.
In addition, P-VOLs and pool volumes that are used by XP Snapshot will require the Business Copy license
capacity. You need to make sure that the Business Copy license capacity will be larger than the total
capacity of these volumes when you decide the Business Copy license capacity.
Even when a volume is used for multiple purposes, only the capacity of this volume itself is added to
the total volume capacity, and there is no need to multiply the capacity of this volume by the number of
purposes it is used for. In other words, even if you, for example, specify a volume as an S-VOL, and use it
as a reserved volume as well by setting its reserve attribute, only the capacity of the volume itself is added
to the total volume capacity and there is no need for it to be doubled.
Caution: If you specify an XP Thin Provisioning volume as a P-VOL or an S-VOL, the capacity of the pool
used by the XP Thin Provisioning volume will require the Business Copy license capacity. Information
about the license capacity of XP Thin Provisioning volumes is not updated in real time. Therefore, certain
write requests may cause the data excess. So, prepare the license capacity corresponding to the pool
capacity when you are going to use the XP Thin Provisioning volumes.
Even if the amount of data exceeds the license capacity, you can use the volumes for additional 30
days. Once 30 days have passed, you cannot do any Business Copy operations except suspending
or deleting pairs.
Below are some illustrated case examples that should help you understand more clearly about how to
calculate the total capacity of Business Copy volumes that will be used. For the sake of explanation,
the capacity of each volume is assumed to be 1. The colored volume or volumes represent the volumes
that are used.
Figure 20 on page 41 shows an example of one reserved volume and one unreserved volume. In this
case, the total capacity of Business Copy volume in use will be 1.
40 Preparing for Business Copy Operations