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Planning: MD3200 Series Storage Array Terms and Concepts
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Host Server-to-Virtual Disk Mapping
The host server attached to a storage array accesses various virtual disks on 
the storage array through its host ports. Specific virtual disk-to-LUN 
mappings to an individual host server can be defined. In addition, the host 
server can be part of a host group that shares access to one or more virtual 
disks.
You can manually configure a host server-to-virtual disk mapping. When you 
configure host server-to-virtual disk mapping, consider these guidelines:
• You can define one host server-to-virtual disk mapping for each virtual disk 
in the storage array. 
• Host server-to-virtual disk mappings are shared between RAID controller 
modules in the storage array. 
• A unique LUN must be used by a host group or host server to access a 
virtual disk. 
• Not every operating system has the same number of LUNs available for 
use. 
Host Types
A host server is a server that accesses a storage array. Host servers are mapped 
to the virtual disks. Host servers have the following attributes:
• Host name—A name that uniquely identifies the host server. 
• Host group (used in Cluster solutions only)—Two or more host servers 
associated together to share access to the same virtual disks. 
This host group is a logical entity you can create in MDSM. All host servers 
in a host group must be running the same operating system. 
• Host type—The operating system running on the host server. 
Snapshot Virtual Disks
A snapshot is a point-in-time image of a virtual disk. The snapshot provides 
an image of the virtual disk at the time the snapshot was created. You create a 
snapshot so that an application (for example, a backup application) can 
access the snapshot and read the data while the source virtual disk remains 
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