•Available, Vraid5. Shows the estimated capacity, if the entire disk group was used for Vraid5 virtual disks.
•Available, Vraid6. Shows the estimated capacity, if the entire disk group was used for Vraid6 virtual disks.
XCS 10000000
•Total capacity. Shows the formatted physical disk drive capacity of the disk group.
•Allocated capacity. Shows the amount of disk group capacity that is being used for virtual disks.
•Available capacity (estimated). Shows the capacity remaining in a disk group if all new virtual disks were to be created as either Vraid0, Vraid1, Vraid5, or Vraid6.
◦Physical. This value is estimated from various factors such as the number and size of virtual disks that might typically be created. The actual available physical capacity can be more or less than the estimate.
◦Thin provisioning. This value is based on the maximum addressable storage space of the storage system.
•Requested capacity. Shows the amount of space in disk group that has been requested for virtual disks.
•Oversubscribed capacity. Shows the amount of space requested via thin provisioning that exceeds the physical capacity that can be allocated.
Redundancy (Vraid) levels
The redundancy (Vraid) level for a virtual disk determines the virtual disk's availability (data protection) and influences its I/O performance. If you are using XCS 09500000 or earlier, the Vraid type cannot be changed after a virtual disk is created. For information about changing the Vraid level on arrays running XCS 10000000 or later, see “Online virtual disk migration” (page 33).
NOTE: HP strongly recommends that you use Vraid6 if you are using disk drives with a physical capacity of 1TB or greater.
Vraid levels are:
•Vraid0. Is optimized for speed and disk space utilization, but provides no redundancy.
IMPORTANT: HP does not recommend using Vraid0 when high availability is required.
•Vraid1. Is optimized for speed and high redundancy, but requires twice the disk space of other Vraid levels. Vraid1 provides sufficient data redundancy to recover from a single disk drive failure. However, if your system uses large capacity disk drives (1TB or larger), reconstruction time may increase the risk of a second disk drive failure occurring prior to the completion of reconstruct.
•Vraid5. Is optimized for speed, disk space utilization, and moderate redundancy. Vraid5 provides sufficient data redundancy to recover from a single disk drive failure. However, if your system uses large capacity disk drives (1TB or larger), reconstruction time may increase the risk of a second disk drive failure occurring prior to the completion of reconstruct.
•Vraid6. Is optimized for speed and the highest redundancy. Vraid6 provides sufficient data redundancy to recover completely from two disk drive failures.
Vraid6 is applicable only for EVA4400, EVA6400, and EVA8400 running controller software 09500000 or later and for P6300 EVA and P6500 EVA running controller software XCS 10000000 or later.
Redundancy (Vraid) levels 29