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SAN Metrics - January 2011

January 2011

3PAR InServ (Type 1 SAN storage)

Virtual Volumes

The 3PAR InServ storage arrays allocate space as "virtual volumes". These storage volumes only allocate real disk space when servers save data, they ignore blank space. Where traditional storage would also use up disk space on the blank areas, these virtual volumes do not. As many servers keep large amounts of blank space as "spare" capacity, this eventually results in a considerable saving, not because the extra disk hardware never needs to be purchased, but also because it would also normally take a lot of electricity to power it and cool it.

Array 1 - 3PAR InServ F400

Number of virtual volumes allocated: 119
Disk space reserved by virtual volumes: 11.8TB
Virtual disk space allocated: 52.3TB
Space saved over traditional storage: 77.4%

Array 2 - 3PAR InServ T800

Number of virtual volumes allocated: 115
Disk space reserved by virtual volumes: 11.4TB
Virtual disk space allocated:


Space saved over traditional storage: 76.9%

Monthly progress

The following graphs show the progress of disk space reservation during the month.

 Reserved Space Jan 2011

 Graph 1: Disk space reserved by virtual volumes

 Virtual Volume Space Jan 2011

 Graph 2: Virtual disk space allocated

Nexsan SATABeast (Type 2 Storage)

Storage Array - KAMEOSA

Volumes allocated 25
Total space used 24662.5 GB
Space available 7341.4 GB


Storage Array - SEKO

Volumes allocated 16
Total space used 32003.29 GB
Space available 0 GB


Storage Array - TANUKI

Volumes allocated 4
Total space used 32004.4 GB
Space available 0 GB


Sun/Storagetek (older SAN Storage)


Worksheet TOTAL Array1 Array2 Array3 Array4
Raw capacity total 189.52TB 68.29TB 46.03TB 23.95TB 51.26TB
Raw capacity allocated 169.53TB 64.51TB 42.3TB 18.98TB 43.75TB
Raw capacity unused 20TB 3.78TB 3.74TB 4.98TB 7.51TB
Volume groups allocated 128.5TB 54.1TB 32.97TB 14.51TB 32.55TB
Parity/Hot Spare allocated 35.41TB 10.42TB 9.33TB 4.48TB 11.2TB
Disks used 558 188 124 99 147
Disks spare 72 18 16 14 24
Storage Partitions licensed   16 64 16 16
Storage Partitions used   12 10 7 12
Storage Partitions available   4 54 9 4
Tray spaces 36 0 0 15 21

Departmental / group usage summary

 Departmental usage October 2010