Which two statements relating to LU configuration and management on the Hitachi Unified Storage systems are correct? (Choose two.)

Question

Options

• AA RAID group cannot be deleted before all its LUs have been deleted.
• BA LU can be physically extended if there is space left in the RAID group.
• CIt is possible to format a LU quicker by attaching it to both controllers.
• DIt is possible to delete all RAID groups including all LUs on the system with one command.

Explanation

Options A and B are the two correct statements.

On Hitachi Unified Storage systems, RAID groups serve as containers for LUs, so the system enforces a dependency hierarchy: you must remove all LUs within a RAID group before the group itself can be deleted (A). Similarly, LUs can be non-disruptively extended as long as unallocated space remains within the same RAID group, making online capacity expansion possible without recreating the LU (B).

Option C is incorrect because LU formatting is a controller-level operation assigned to a single owning controller - attaching a LU to both controllers does not parallelize or accelerate the format process. Option D is incorrect because no such "delete everything" single command exists; storage systems deliberately prevent mass-destructive operations to protect data integrity, requiring admins to delete LUs and RAID groups individually or in structured sequences.

Memory tip: Think of RAID groups as filing cabinets and LUs as folders inside them - you must empty the cabinet (delete LUs) before removing it (delete RAID group), and you can add pages to a folder (extend a LU) as long as the cabinet has room.

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