Cross Vraid Guidelines - HP 418800-B21 - StorageWorks Modular Smart Array 70 Storage Enclosure User Manual

Disk use
Disaster tolerance
Disk-to-disk backup
Disk-to-tape backup
Frequent file access
Infrequent file access
Highest performance
Virus attack recovery
Disk group capacity and occupancy
The capacity of a disk group is established when it is created using HP Command View EVA and is
expressed in terms of redundancy level (Vraid). For example, the disk group named Test might have
the following Vraid-based capacities:
Vraid0: 337.57 GB
Vraid1: 156.60 GB
Vraid5: 270.07 GB
The term occupancy refers to the amount of disk space (GB) being used in a disk group.
Disk group occupancy alarm level
The occupancy alarm level is the point (percent of capacity) at which the array issues an a disk group
occupancy warning. For example, if a disk group's capacity is 200 GB, and the occupancy alarm level is
80%, the warning is issued when the total capacity of the virtual disks in the disk group reaches 160 GB.
The default occupancy alarm level is 95% of capacity.
Impacts of an occupancy warning
When an occupancy warning is issued:
• No virtual disks (LUNs) in the disk group can be created or enlarged.
• No mirrorclones, snapclones and snapshots can be created in the disk group.
• The disk drive failure protection level (spares) in the disk group cannot be increased.

Cross Vraid guidelines

Cross Vraid (redundancy) guidelines:
• Snapclone copy. Redundancy level can be higher or lower than the source.
• Snapshot copy. Redundancy level cannot be higher than the source.
• Remote copy. Redundancy level can be higher or lower than the source.
See also virtual disk
Quick reference
Near-
Online
online
yes yes
- yes
- yes
yes -
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yes -
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redundancy level.
HP StorageWorks Replication Solutions Manager 4.0.1
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