Hitachi MK-96RD626-07 User Manual page 35

Local Storage System
External
Port A
External
Internal
Port B
Volume
External
Port C
Local Storage System
External
Port A
External
Internal
Port B
Volume
External
Port C
Legend
: Internal volume where the external volume is mapped
: I/O
Figure 2-6 When the Path Mode is Multi Mode
•
When the path mode is Single mode
Figure 2-7 shows an example of the case when the path mode is Single
mode. When an error occurs in the path that is being used for I/Os, the I/O
execution path is switched to the path with the second highest priority.
Note: As you restore the path with the priority higher than the currently
used path, the I/O execution path is automatically switched to the restored
path that has the highest priority.
About Universal Volume Manager Operations
Hitachi Universal Storage Platform V/VM Universal Volume Manager User's Guide
External Storage System
Port
Path
WWN A
Priority 1
Port
Path
WWN B
Priority 2
Port
Path
WWN C
Priority 3
External Storage System
Port
Path
Error
WWN A
Priority 1
Port
Path
WWN B
Priority 2
Port
Path
WWN C
Priority 3
External
Volume
External
Volume
2-15