Users Guide

Disk Groups and Virtual Disks 53
6
Disk Groups and Virtual Disks
Following is a list of terms used throughout this chapter:
• Disk Group — A set of physical disks that are logically grouped and
assigned a RAID level. Every disk group provides the overall capacity
required to create one or more virtual disks.
• Virtual Disk — A logical component created to enable hosts to access
storage on the storage array. A virtual disk is created from the capacity
available on a disk group and appears as one logical component even
though it is created from more than one physical disk.
• Storage Partitioning —
Logical division of a storage array into entities
consisting of one or more virtual disks that can be accessed by a single host
or shared among hosts that are part of a host group.
• Unconfigured Capacity — Physical disks that are not already assigned to
a disk group.
• Free Capacity — Space in a disk group that has not been assigned to a
virtual disk.
• Standby Hot Spare Drive — Physical disk that has been assigned as a hot
spare drive and is available to take over for any failed physical disk.
• In-use Hot Spare Drive — Physical disk that has been assigned as a hot
spare drive and is currently taking over for a failed physical disk.
• Snapshot Virtual Disk — Point-in-time image of a virtual disk in a
storage array.
• Snapshot Repository Virtual Disk — Virtual disk containing metadata and
copy-on-write data for a particular snapshot virtual disk; automatically
created when the snapshot virtual disk is created.
• Consistency Check — Background operation that checks the parity of
virtual disks.