SANRAD I3.1.1205 - Manual (Page 110)

6-18 SANRAD V-Switch CLI User Manual
Disk 3 Disk 4
Simple 2
Disk 1
Simple 1
Simple 4
Simple 3
Disk 2
Simple 8
Disk 5
Simple 7
Simple 10
Disk 6
Simple 9
Disk 7 Disk 8
100
6 0
Simple 5 Simple 6 Simple 11 Simple 12
JBOD 1 JBOD 2
Striped
Volume 1
Figure 6-12. Striped Volume 1
Creating a Mirrored Volume
Use mirroring to
create data backups.
The V-Switch
supports a maximum
of 512 volumes.
A mirrored volume is synchronously written into two or more volumes.
Mirrored volumes provide protection against data loss from a physical
disk crash. To be a true mirror and realize the full potential of a mirror,
the mirrored volumes must be located on different physical disks.
In Figure 6-13, data block 1 is mapped to both block 5 on Disk 1 and block
9 on Disk 2. Data blocks 2, 3 and 4 are mapped to both blocks 6,7 and 8 on
Disk 1 and blocks 10, 11 and 12 on Disk 2.