Dell PowerVault MD3220 Owner's Manual page 127

More than one storage partition is required if:
• Specific hosts must access specific virtual disks in the storage array.
• Hosts with different operating systems are attached to the same storage
array. In this case, a storage partition is created for each host type.
You can use the Storage Partitioning Wizard to define a single storage
partition. The Storage Partitioning wizard guides you through the major steps
required to specify which host groups, hosts, virtual disks, and associated
logical unit numbers (LUNs) are to be included in the storage partition.
Storage partitioning fails when:
• All mappings are defined.
• You create a mapping for a host group that conflicts with an established
mapping for a host in the host group.
• You create a mapping for a host in a host group that conflicts with an
established mapping for the host group.
Storage partitioning is unavailable when:
• No valid host groups or hosts exist in the Topology pane on the Mappings
tab.
• No host ports are defined for the host being included in the storage
partition.
• All mappings are defined.
NOTE:
However, any hosts that are mapped to the secondary virtual disk has read-only
access until the virtual disk is promoted to a primary virtual disk, or the mirror
relationship is removed.
Storage partitioning topology is the collection of elements, such as Default
Group, host groups, hosts, and host ports shown as nodes in the Topology
pane of the Mappings tab in the AMW. For more information, see "Using the
Mappings Tab" on page 84.
If a storage partitioning topology is not defined, an informational dialog
appears each time you select the Mappings tab. You must define the storage
partitioning topology before you define the actual storage partition.
You can include a secondary virtual disk in a storage partition.
Configuration: Disk Groups and Virtual Disks
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