When to use encryption keys

After you set up the encryption environment, you will need encryption keys to perform the following operations:

Adding drives
A Free key is needed for each drive to allocate a DEK.
Replacing drives
A Free key is needed for each drive to change a DEK.
Adding or replacing encrypting back-end directors (EBEDs)
For VSP Gx00 models and VSP Fx00 models: To replace an EBED, two Free keys are used as CEKs. One Free key is used to register them.
Updating CEKs
For VSP G200, VSP G400, G600, and VSP F400, F600: Two Free keys for each EBED (four Free keys per storage system) are needed to change CEKs.

For VSP G800 and VSP F800:

Four Free keys for each EBED (up to 16 Free keys per storage system, regardless of the number of EBEDs) are needed to change CEKs.

If a problem occurs during an operation, extra keys might be needed to recover from the problem.