Hp LeftHand P4000 SAN Solutions User Manual Page 151

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Figure 74 Viewing the space saved or reclaimable in the Volume Use tab
1. Space saved or reclaimable displayed here
System Use summary
The System Use window presents a representation of the space provisioned on the storage systems
in the cluster.
NOTE: The raw capacity and usable disk space are reported in different units of measurement
for an HP StoreVirtual storage system. Due to the different units of measurement between Terabytes
(TB) and Tebibytes (TiB), the raw capacity reported in an HP StoreVirtual storage system may
appear to be lower than expected. One TB of data is 10^12 bytes where a TiB is 2^40 bytes, a
difference of approximately 100 GB. The CMC reports values in TiB and HDD manufacturers
typically report their size in TB. For example, a 3 TB HDD would be reported as having a size of
2793.97 GB by the CMC. For an HP StoreVirtual 4330 storage system with 8 1 TB HDDs, a raw
capacity of 7 TB would be expected when using RAID 5 (where one drive is used for data parity),
but the CMC would report a raw capacity of 6519.26 GB. This is the expected behavior, and it
is simply two different methods of representing the same number of bytes.
Figure 75 Viewing the System Use tab
Table 49 Information on the System Use tab
DescriptionCategory
Host name of the storage system.Name
Total amount of disk capacity on the storage system. Note: Storage systems with greater capacity
will only operate to the capacity of the lowest capacity storage system in the cluster.
Raw space
RAID level configured on the storage system.RAID configuration
Space available for storage after RAID has been configured. Be aware that the amount listed for
Usable space differs depending on whether the storage system is a member of a management
Usable space
Ongoing capacity management 151
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