Dell PowerVault MD3000i Hardware Owner's Manual - Page 44

Host Types, Snapshot Virtual Disks, you create a snapshot so that an application for example, a backup

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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 will have the same number of LUNs available for use. Host Types Generally, a host server is a server that accesses a storage array. Host servers are mapped to the virtual disks and use one or more iSCSI initiator ports. In general, 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. A host group is a group of two or more host servers that share access to specific virtual disks on the storage array. This host group is a logical entity you can create in MD Storage Manager. 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. Typically, 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 online and user-accessible. When the backup is completed, the snapshot virtual disk is no longer needed. You can create up to four snapshots per virtual disk. 44 Using Your RAID Enclosure

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44
Using Your RAID Enclosure
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 will have the same number of LUNs available
for use.
Host Types
Generally, a host server is a server that accesses a storage array. Host servers
are mapped to the virtual disks and use one or more iSCSI initiator ports. In
general, 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
server
s
associated together to share access to the same virtual disks.
A host group is a group of two or more host
server
s that share access to
specific virtual disks on the storage array. This host group is a logical entity
you can create in MD Storage Manager. All host
server
s 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. Typically,
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 online and user-accessible. When the backup is
completed, the snapshot virtual disk is no longer needed. You can create up to
four snapshots per virtual disk.