Dell Compellent Series 40 - Manual (Page 113)

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Viewing Volume Information
• Disk space saved vs. basic RAID 10 storage shows the storage savings through the
effective use of RAID 5 rather than RAID 10. The difference between volume space
consumed and disk space consumed is the space required for RAID parity. For
example, a RAID 10 volume is written twice. The disk space required is twice the volume
space required. Disk space is required for RAID 5 parity blocks that is not used in the
volume space.
System Manager displays distribution usage for volumes and Replays for each disk tier and
RAID selection within the tier. If there is no contention for storage space in the first RAID
selection, it is assigned storage from that selection.
Viewing Volume Charts
In the Volume Info window, click the Charts table. Charts display Read, Write, and total KB/
sec and IO/sec in real time.
Viewing Volume Distribution Reports
The Volume Distribution Reports window displays how volumes are consuming storage
space. Information includes the logical space of each volume is consumed, and the
relationship between logical space and physical space.

To view the volume distribution report
1 From the View menu, select Online Storage.
2 Click the Volume Distribution Report tab. The Volume Distribution Report appears.