If you select Internal as the mode of key management, you need to set the --interval option, which specifies the number of days for key rotation when a new key is to be generated.
Usage:
storage_group --show [--name <name>]
[--verbose]
storage_group --add --name <name>
[--compression_mode <fast|best>]
storage_group --update --name <name>
[--compression_mode <fast|best>]
storage_group --encryption --name <name>
[--set <ON|OFF>]
[--mode <static | internal>]
[--interval <7 days to 70 years>]
storage_group --delete --name <name>
storage_group --setpassphrase --name <name>
storage_group --help
storage_group <command> <command-arguments>
command can be one of:
--show Displays the current list of storage_group.
--add Adds a new storage_group.
--update updates a storage_group.
--encryption updates encryption settings of a storage_group.
--delete Deletes an existing storage_group.
--setpassphrase sets passphrase to a storage_group.
For command-specific help, please type storage_group --help <command>
eg:
storage_group --help show