If you plan to execute CCI commands from an open-systems host (in-band method), you must set at least one logical device as a CCI command device. The dedicated command device functions as the interface to the CCI software on the host and cannot be used by any other applications. You can configure more than one command device (primary and alternate command devices) to ensure continued operations in the event the primary command device is blocked.
A command device can be any volume that is accessible to the host on which CCI is installed. A volume as small as 36 MB can be used as a command device. Make sure the volume to be used as a command device does not contain any user data. The command device will be inaccessible to host applications.
If you want to enable command device security, user authentication, and device group definition, you must enable the command device.
After you set the command devices on the storage system, you must define the command devices in the CCI configuration definition file.
For details, see the CCI documentation.
- Volumes whose access attribute is other than read/write
- TrueCopy pair volumes
- Global-active device pair volumes
- ShadowImage pair volumes
- Universal Replicator pair volumes
- Volumes used in Thin Image Advanced
- Volumes reserved by Data Retention Utility
- Journal volumes
- Pool volumes that include a V-VOL with the direct mapping attribute enabled
- Remote command devices
- Quorum disks for global-active device
- LDEVs with the T10 PI attribute enabled