Filter
Top Products
2-16 Architecture and Components
Hitachi Universal Storage Platform V/VM User and Reference Guide
Intermix Configurations
RAID-Level Intermix
RAID technology provides full fault-tolerance capability for the disk drives of
the Universal Storage Platform V/VM. The cache management algorithms
enable the USP V to stage up to one full RAID stripe of data into cache ahead
of the current access to allow subsequent access to be satisfied from cache at
host channel transfer speeds.
The Universal Storage Platform V supports RAID-1, RAID-5, RAID-6, and
intermixed RAID-level configurations, including intermixed array groups within
an array domain.
Figure 2-8 illustrates an intermix of RAID levels. All types of
array groups (RAID-5 3D+1P, 7D+1P; RAID-1 2D+2D, 4D+4D; RAID-6
6D+2P) can be intermixed under one BED pair.
03
46 47 02 03
46 47 02 03
46 47
46 47
BED
(CL1)
RAID group
(7D+1P/6D+2P)
BED
(CL2)
0
1
2
3
0
1
2
3
1st, 3rd
5th or 7th
BED Pair
RAID group
(2D+2D)
02
02
03
46 47 02 03
46 47 02 03
03 46 47 02
BED
(CL2)
0
1
2
3
BED
(CL1)
0
1
2
3
46 47 02 03
RAID group
(4D+4D)
RAID group
(3D+1P)
RAID group
(3D+1P)
2nd, 4th
6th or 8th
BED Pair
01
00 01
00 01
0100
0100
00 01
00 01
00
00 01
RAID group
(4D+4D)
Figure 2-8 Sample RAID Level Intermix