Dell PowerVault MD3200 Owner's Manual - Page 49
Host Server-to-Virtual Disk Mapping, Host Types, Snapshot Virtual Disks
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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 Planning: MD3200 Series Storage Array Terms and Concepts 49