HP StorageWorks XP Remote Web Console Software - Manual (Page 14)

14 Requirements and overview of copy operations
• If a volume is already specified as the P-VOL or S-VOL for one Flex Copy XP copy pair, you cannot
specify that volume as the P-VOL or S-VOL of another Flex Copy XP copy pair ( Figure 3 ).
Figure 3 Example of volumes that cannot be shared by Flex Copy XP pairs
• The LUSE volume configuration for the P-VOL and S-VOL must be exactly the same. Map the external LU,
which is used as a copy pair volume, as an internal LU, and then set the volume as a LUSE volume that
has the same configuration as the local array volume that will be a copy pair with the mapped
external LU.
• If you use LUN Security XP Extension to prevent a volume from being specified as an S-VOL, you cannot
specify the volume as a Flex Copy XP S-VOL.
• If the VMA of LUN Security XP Extension is set for a volume, you cannot use the volume as a Flex Copy
XP volume.
Overview of copy operations
After mapping an external LU as a local array volume using External Storage XP, you can use Flex Copy
XP to create a copy pair consisting of a local array volume and the mapped external LU, and then
perform copy operations.
After mapping an external LU as a local array volume using External Storage XP, you can also use RAID
Manager XP to perform copy operations on a copy pair consisting of an internal LU and external LU
mapped by External Storage XP.
General cautions and notes about Flex Copy XP operations
The following are cautions about Flex Copy XP copy operations:
• When creating copy pairs, ensure that hosts do not access external LUs mapped as internal LUs.
If host access occurs during copy processing, backup data consistency cannot be guaranteed.
HP recommends unmounting volumes mapped as internal LUs from hosts connecting to the external
array, and ensure that volumes are used exclusively for Flex Copy XP.
• After creating a copy pair with Flex Copy XP, hosts connecting to the local array cannot access the
internal LUs until you delete the copy pair with Flex Copy XP.
The following are notes about Flex Copy XP copy operations:
• Before creating a copy pair, all data in the host must be applied to the volume.
• If a host uses middleware, such as volume manager, data in the copy destination volume (S-VOL) will
not match data in the host until data in the copy source volume (P-VOL) is exported from the host and
applied to the array.
When copying data from an external array to a local array, you must export data from volume
manager on the host connecting to the external array, and then apply it to the external array. Then
perform a copy operation using Flex Copy XP. After copy processing finishes, cancel the copy pair. By
importing copied data from volume manager on the host connecting to the local array, you ensure that
data in the external array can be used on the local array.