HP StorageWorks Application Recovery Manager Installation and Licensing Guide (T4395-96002, February 2008)

Application Recovery Manager Licensing
License Checking and Reporting
Chapter 484
Used Capacity Calculation
The used capacity calculation calculates the licensed capacity of each
disk array type used in the past twenty-four hours. Disks used two or
more times in the specified time interval are only counted once. Disk
array units are identified by their identification numbers taken from
each array. The use of array identification numbers means that it is
possible to know when an array has already been counted.
If a ZDB backup has been run, the original unit’s total capacity is
calculated for instant recovery capacity per disk array.
For example, imagine a scenario where there are two disk arrays. On one
array there is a single disk (App. 1) with a capacity of 200 GB being used
for data protection. Backup sessions are triggered three times a day.
Three snapshots at a time are kept, these are rotated for instant recovery
purposes. On the second disk array there are two disks (App. 2 and App.
3) with capacities of 150 GB and 120 respectively. Backup is run once a
day on App.2 disk. On App. 3, backup is run three times a day and five
different snapshots are rotated for instant recovery. See Figure 4-1.