HP Command View EVA Software - Manual (Page 27)

Disk types
The disk type specifies the type of physical disk drives that can be included in a disk group. The
types are:
Online disk type. All physical drives must be Fibre Channel or enterprise SAS drives. This disk type
provides first tier performance and reliability.
Near-online disk type. All physical drives are lower cost, lower performance hybrid Fibre Channel
or midline SAS disk drives. Hybrid drives are dual ported, Fibre Attached Technology Adapted
(FATA) drives. This disk type provides second tier performance and reliability.
Solid state drive disk type. All physical drives must be solid state drives (SSD). This disk type
provides first tier, very high performance and reliability.
Disk type support varies with HP XCS controller software versions. The following table summarizes
support and typical uses.
Solid state drive Near-online Online Feature
XCS 09500000 or later All versions All versions XCS support
Solid state drives FATA/SAS drives Fibre Channel/SAS drives Physical disks
Typical uses
Preferred usage Preferred usage Preferred usage Disaster tolerance
Preferred usage Disk-to-disk backup
Preferred usage Disk-to-tape backup
Preferred usage Preferred usage Frequent file access
Preferred usage Infrequent file access
Preferred usage Preferred usage High performance
Preferred usage Virus attack recovery
Disk group types
When a disk group is created, it is assigned a disk group type: basic or enhanced (default).
EVA support Supported Vraid levels Disk group type
EVA4000/4100/4400/6000/
6100/6400/8000/8100/8400 Vraid0, Vraid1, and Vraid 5 Basic
EVA4400/6400/8400
P6300/P6350/P6500/P6550 EVA Vraid0, Vraid1, Vraid5, and Vraid6 Enhanced
General guidelines
One disk group (the default) is created when the system is initialized. You can add disk groups as
needed.
•
Each physical disk drive can belong to only one disk group.
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A single disk group may contain all the physical disk drives in the storage system.
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Multiple virtual disks can be created in a disk group, up to the disk group's capacity.
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Each virtual disk exists entirely within one disk group.
Disk groups 27