XEVO
Software Manual
Storage Tab
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www.qsan.com
Official
Document
22
5.
S
TORAGE
T
AB
The
Storage
tab manages the storage pools. It displays the storage pool status, configures the
storage pool, and takes snapshots. This chapter describes the details of storage management
operations and examples.
5.1.
RAID and RAID EE Summary
Below is a summary of RAID and RAID EE levels. This will help you understand the idea of
creating a storage pool.
Table 5-1 RAID Level Summary - 1
RAID 0
RAID 1
RAID 3
RAID 5
RAID 6
N-WAY
MIRROR
Min. # Drives
1
2
3
4
3
Fault
Tolerance
No protection
One drive
failure
One drive
failure
Two drive
failures
N-1 drive
failures
Read
Performance
Very Good
Very Good
Very Good
Very Good
Very Good
Write
Performance
Excellent
Good
Good
Fair to Good
Fair
Capacity
(N = drive
quantity, M =
drive capacity, G =
subgroups)
N x M
(e.g., 8 drives x
1TB = 8TB)
N/2 x M
(e.g., 8 drives / 2 x
1TB = 4TB)
(N-1) x M
(e.g., (8 drives -1)
x 1TB = 7TB)
(N-2) x M
(e.g., (8 drives -2)
x 1TB = 6TB)
(N/N) x M
(e.g., 8 drives / 8 x
1TB = 1TB)
Capacity
Utilization
(Min.~26 drives)
100%
(e.g., 8/8 = 100%)
50%
(e.g., 4/8 = 50%)
67% ~ 96%
(e.g., 7/8 = 88%)
50% ~ 92%
(e.g., 6/8 = 75%)
4% ~ 33%
(e.g., 1/8 = 13%)
