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# Understanding All Flash Mixed FBA/CKD support

Unisphere supports All Flash Mixed FBA/CKD storage systems.

With the release of HYPERMAX OS 5977 Q2 2017, Unisphere introduces support for All Flash Mixed FBA/CKD storage systems.

| NOTE: This feature is only available for All Flash 450F/850F/950F storage systems that are: Purchased as a mixed All Flash system Installed at HYPERMAX OS 5977 Q2 2017 or later Configured with two Storage Resource Pools - one FBA Storage Resource Pool and one CKD Storage Resource Pool

You can provision FBA/CKD storage to a mainframe host using the Provision Storage wizard.

For specific instructions about how to provision storage for mainframe, see Provision Storage wizard for mainframe. By default only the CKD SRP is available in the Storage Resource Pool drop-down list.

To provision storage for Open Systems, see The Provision Storage wizard. By default only the FBA SRP is available in the Storage Resource Pool drop-down list.

For specific instructions about how to modify a storage group, see Modify storage groups. Depending on the storage group selection, the Storage Resource Pool drop-down list is filtered to display the CKD or FBA SRP.

| NOTE: A CKD SG can only provision from a CKD SRP. An FBA SG can only provision from an FBA SRP. FBA volumes cannot reside in a CKD SRP. CKD volumes cannot reside in an FBA SRP. Data reduction is only for FBA volumes.

## Mapping FBA devices to CU images

You can map FBA devices to front-end EA/EF directors. Addressing on EA and EF directors is divided into Logical Control Unit images (CU images). Each CU image has its own unique SSID and contains a maximum of 256 devices (numbered 0x000 through 0xFF). When mapped to an EA or EF port, a group of devices becomes part of a CU image.

For more information about how to map FBA devices to CU images (not supported on storage systems running PowerMaxOS 10 (6079)), see the following tasks:

- z/OS map FBA volumes from the Volumes (Storage Groups) list view
- z/OS unmap FBA volumes from the Volumes (Storage Groups) list view