User manual

Promise Array Management
76
RAID 1
RAID 1 takes the data written on one disk
and copies it to another, making a mirror or
exact copy. This arrangement does not have
a significant performance advantage. If one
disk fails, there is no data loss. There is no
rebuild, just a copy of the data to the disk.
RAID 0+1
2
4
6
8
1
3
5
7
2
4
6
8
1
3
5
7
Disk Drives
Data
Mirror
Data Stripe
RAID 0+1 is a combination the high data rates of RAID 0 and full redundancy of
RAID 1. A disadvantage is that you must have at least 4 hard disks to implement
it. If one disk fails, there is no data loss. There is no rebuild, just a copy of the
data to the disk.
1
2
3
4
1
2
3
4
Disk Drives
Data Mirror