HP P6000 SmartStart Storage Software - Manual (Page 21)

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Total capacity. Shows the formatted physical disk drive capacity of the disk group.
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Allocated capacity. Shows the amount of disk group capacity that is being used for virtual
disks.
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Maximum Vdisk Size. Shows the largest size for a virtual disk (up to 2 TB) that could be created
in the disk group, using either Vraid0, Vraid1, or Vraid5.
HP VCS 3.x, VCS 4.x, XCS 5.x , and XCS 6.x
HP P6000 Command View uses these capacity-related terms for disk groups:
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Total capacity. Shows the formatted physical disk drive capacity of the disk group.
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Allocated capacity. Shows the amount of disk group capacity that is being used for virtual
disks.
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Maximum Vdisk Size. Shows the largest size for a virtual disk (up to 2 TB) that could be created
in the disk group, using either Vraid0, Vraid1, or Vraid5.
Example
Assume that the capacity of a disk group is expressed as:
Vraid0 capacity: 337 GB
Vraid1 capacity: 156 GB
Vraid5 capacity: 270 GB
In this example, if all virtual disks in the disk group were created as Vraid0, the group would have
a maximum capacity of 337 GB. At the other extreme, if all virtual disks in the disk group were
created as Vraid,1 the group would have a maximum capacity of 156 GB. In typical use, a mix
of Vraid types in a disk group results in a maximum capacity that falls between the extremes.
Disk group allocation and alarm levels
In HP P6000 management software, allocation is the amount of disk space being used in a disk
group. The allocation alarm level is the point (percent of capacity) at which the storage system
issues a disk group allocation warning. When an allocation warning is issued, no more virtual
disks can be created in the disk group.
See also Physical disk drive capacity , Storage system and storage network capacity and Virtual
disk capacity .
Disk group guidelines and best practices
When using HP P6000 Command View to create disk groups, consider the following guidelines
and best practices:
General guidelines
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A disk group can include only one disk type .
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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.
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Each physical disk drive can belong to only one disk group.
Number of physical disks in a group
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With online and near-online disk types, the minimum number of physical disks per disk group
is 8. There is no maximum number. If desired, all of the physical disks in an HP P6000 storage
system, of either disk type, can be included in a single disk group.
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With the solid state drive disk type, the minimum number of physical disks is 6 and the
maximum is 8. Also, a storage system can have only 1 disk group of solid state drives.
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If the number of disks is not specified when creating a disk group, the minimum is assigned.
If the minimum number of disks is not available, a disk group cannot be created.
Disk group guidelines and best practices 21