IBM System storage DS6000 Series, Redbooks

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Chapter 8. Configuration planning
135
CKD volumes will be FlashCopied, then you only need to purchase a license for 5 TB PTC
and not the full 20 TB. The 5 TB of PTC would be set to CKD only.
Figure 8-4, shows an example of a FlashCopy feature code authorization. In this case, the
user is authorized up to 25 TB of CKD data. The user cannot FlashCopy any FB data.
Figure 8-4 User authorized to FlashCopy 25 TB of CKD data
In Figure 8-5 on page 136, the user decides to change the license scope from CKD to ALL
and FlashCopy the FB data as well. This increase of licensed scope from CKD to ALL is
non-disruptive. Changing the license scope from FB to CKD or CKD to FB (lateral change) or
reduction in license scope from ALL to FB or CKD will be disruptive and will require an IML. In
this example, the user decides to FlashCopy 10 TB of FB and 12 TB of CKD data. The user
has disk capacity of 20 TB of FB and 25 TB of CKD. In order to implement the changes, the
user now has to purchase a Point-in-Time Copy function authorization of 45 TB. The user has
to purchase authorization for the total FB and CKD capacity. In this case the total is the sum
of 20 TB of FB and 25 TB of CKD, which equals 45 TB.
20 TB
FB
DS6000 with 45 TB disk capacity in total,
25 TB of CKD FlashCopy authorization with
license scope of CKD,
45 TB of OEL Licensed function
25 TB
CKD
User cannot FlashCopy
any FB
User authorize to
FlashCopy
up to 25 TB
20 TB (FB) +
25 TB (CKD) +
--------
45 TB total capacity
--------