Storage Management
111
RAID 60 (RAID 6 on top of RAID 0)
RAID 60 is the combination of RAID 6 and RAID 0, do RAID 6 first, further RAID 0. In other
words, it accesses stripes for more than two groups of RAID 6. RAID 6 needs to have at
least four disk drives, so the minimum requirement of RAID 60 is eight disk drives.
RAID 60 can tolerate maximum two damage disk drives in any disk group of RAID 6, while it
still maintains the operating, but as long as it damages three drives in any group of RAID 6,
the entire RAID 60 will fail. Of course, the probability of this case is quite low.
Compared to a simple RAID 6, RAID 60 binds stripes through multiple of RAID 6. Therefore it
has higher performance. However, high threshold usage and the capacity utilization rate are
major problems.
The following is the summary of the RAID levels.
Table 8-1
RAID Level Summary - 1
RAID 0
RAID 1
RAID 3
RAID 5
RAID 6
N-way
Mirror
Min. Drives
1
2
3
4
3
Data Protection No
protection
One drive
failure
One drive
failure
Two drive
failure
N-1 drive
failure
Read
Performance
Very Good
Very Good
Very Good
Very Good
Very Good
Write
Performance
Excellent
Good
Good
Fair to Good Fair
Capacity
(If drive qty. =
N, drive
capacity = M)
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%)
Typical
Applications
High end
workstation,
Data
logging,
Real-time
rendering,
Operating
system,
Transaction
database
Data
warehouse-
ing, Web
serving,
Archiving
Data
archive,
Backup to
disk, High
Availability
solution,
Operating
system,
Transaction
database
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