There are operational limitations that are associated
with the use of the DS CLI.
These limitations are described as follows:
- Volumes in the same volume space, logical subsystem (LSS), logical control
unit (LCU), or address group cannot be of mixed type. They are either fixed
block or count key data (CKD).
Note: The volume space is called an extent
pool. An extent pool contains one or more ranks of a common storage type (fixed
block or CKD).
- Logical subsystems cannot be created using the DS CLI. A fixed block LSS
is automatically created when your first fixed block volume is assigned to
the LSS address space. A fixed block LSS is automatically deleted when the
last fixed block volume is removed from an LSS address space.
Note: You can
use DS CLI commands to create, modify, and delete logical control units (LCUs),
which are the CKD volume equivalent of a fixed block LSS.
- If you are using the Cisco MDS 9216 Multilayer Fabric Switch,
you must not enable its write acceleration feature. The Remote Mirror and
Copy commands might fail if the write acceleration feature is enabled.
- A maximum of 256 volumes for each logical subsystem can be defined.
- You must not start more than 100 DS CLI sessions simultaneously.
Starting more than 100 DS CLI sessions simultaneously can result in connection
problems.