HP StorageWorks Business Copy EVA V3.x Administrator Guide (T3680-96001, April 2005)

HP StorageWorks Business Copy EVA Administrator Guide 13
Managing local replication licenses
To perform local replication (create snapclones and snapshots), an HP StorageWorks array must have a
valid local replication license. This replication license is also known as a license-to-use, or LTU.
Determining required LTUs
For each array, estimate the source storage space (in TB) to be locally replicated, regardless of the Vraid
level. This space is called the array’s replicated capacity. For each array, provide HP Business Copy EVA
LTUs that equal or exceed the amount of replicated space.
Source replicated capacity is different (less) than the total (or raw) capacity of an array. The total capacity
of an array is the sum of the raw capacities of the individual disk drives in the array, regardless of the
Vraid level.
You can make and retain multiple snapshots and snapclones, even if the aggregate space for the copies
exceeds the source space. The LTU covers the source capacity being replicated. You can make and retain
as many copies as space on the array allows.
Example 1. Assume that you have 1.5 TB of source volumes on an array that requires local replication. This
array requires LTUs that equal or exceed 1.5 TB. This can be achieved through two 1-TB LTUs, or a single
unlimited LTU.
Example 2. Assume that you do not know in advance the amount of source space that requires local
replication, but believe it to be less than 1 TB. This array requires at least a minimum (1-TB) LTU to perform
local replication. If you need to license more replicated capacity later, you can upgrade to an unlimited
LTU for the array.
Example 3. Assume that an array has a total capacity of 10 TB. You do not know in advance the amount
of source space that requires local replication, but believe it to be more than 1 TB. In this case, an
unlimited LTU would be best.
Verifying licensed arrays
1. Browse to the HP Command View EVA interface
2. Select Agent Options > Licensing Options > View Previously Entered License Keys.
The View License Key window appears.
3. Review the list and look for entries like FEATURE HSV11x-SNAPSHOT. Reference to the snapshot
feature indicates that the array is licensed for local replication.
Installing replication license keys
You install local replication license keys using the HP Command View EVA interface. Documentation for
installing replication license keys is included in the license kits that you receive.