Restrictions for addition of disk shelves to an active/active configuration

The following table lists some of the restrictions for adding disk shelves to your active/active configuration.

See the DiskShelf14 and DiskShelf14mk2 FC Hardware Guide for a detailed discussion of restrictions.

See the System Configuration Guide for the maximum number of FC-AL adapters your storage system supports and for additional restrictions.

If your active/active configuration has…	And you are…	Then…
FC7 or FC8 disk shelves	Adding FC9 disk shelves in the same loop	Disk shelf 0 must be an FC7 disk shelf.
FC7, FC8, or FC9 disk shelves	Adding DS14/DS14mk2 FC disk shelves with LRCs	A DS14/DS14mk2/DS14mk4 FC must be the last disk shelf in the loop.
DS14/DS14mk2/DS14mk4 FC disk shelves with ESH, ESH2 or ESH4 modules	Hot-adding a disk shelf	Disks should be pre-zeroed and used as spares. You can only hot-add a DS14/DS14mk2/DS14mk4 FC disk shelf to an existing DS14/DS14mk2/DS14mk4 FC disk shelf. A DS14/DS14mk2/DS14mk4 FC disk shelf must be the last disk shelf in the loop. DS14/DS14mk2/DS14mk4 FC disk shelves that have ESH, ESH2 or ESH4 modules can only be added to disk shelf loops that have ESH, ESH2 or ESH4 modules. If the new disk shelf is a DS14/DS14mk2/DS14mk4 FC disk shelf , the loop speed switch must be set for the appropriate installation.
DS14mk2 AT disk shelves with AT-FCX modules	Hot-adding a disk shelf	Disks should be pre-zeroed and used as spares. You can only hot-add a DS14mk2 AT disk shelf to an existing a DS14mk2 AT disk shelf. a DS14mk2 AT disk shelves that have AT-FCX modules can only be added to disk shelf loops that have AT-FCX modules.

Parent topic: Overview of adding storage to non-multipath configurations