Dell POWERVAULT MD3620I - Manual (Page 50)

50 Planning: MD3600i Series Storage Array Terms and Concepts
• Migrating virtual disks to a storage array with no existing physical disks—
Turn off the destination storage array, when migrating disk groups or a
complete set of physical disks from a storage array to another storage array
that has no existing physical disks. After the destination storage array is
turned on and has successfully recognized the newly migrated physical
disks, migration operations can continue.
NOTE: Disk groups from multiple storage arrays must not be migrated at the
same time to a storage array that has no existing physical disks. Use cold
virtual disk migration for the disk groups from one storage array.
• Enabling premium features before migration—Before migrating disk
groups and virtual disks, enable the required premium features on the
destination storage array. If a disk group is migrated from an MD3600i
storage array that has a premium feature enabled and the destination array
does not have this feature enabled, an Out of Compliance error message
may be generated.
Disk Roaming
You can move physical disks within an array. The RAID controller module
automatically recognizes the relocated physical disks and logically places
them in the proper virtual disks that are part of the disk group. Disk roaming
is permitted when the RAID controller module is either online or powered
off.
NOTE: The disk group must be exported before moving the physical disks.
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.
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