Reverse Cabling; Figure 17 Reverse Cabling (Eternus Dx600 S5) - Fujitsu ETERNUS DX S5 Series Design Manual

2. Basic Functions
Data Protection

Reverse Cabling

Because the ETERNUS DX uses reverse cabling connections for data transfer paths between controllers and
drives, continued access is ensured even if a failure occurs in a drive enclosure.
If a drive enclosure fails for any reason, access to drives installed in the drive enclosures subsequent to the failed
drive enclosure is maintained because normal access paths are secured by using reverse cabling.
Figure 17 Reverse Cabling (ETERNUS DX600 S5)
IOM#0
IOM#0
IOM#0
IOM#0
IOM#0
IOM#0
CM#0
(Connect the controller enclosure to the last drive enclosure)
Accessible
:
Inaccessible
:
DE#06
IOM#1
DE#05
IOM#1
DE#04
IOM#1
DE#03
in a drive enclosure
IOM#1
DE#02
IOM#1
DE#01
IOM#1
CE
CM#1
Reverse cabling connection
A failure occurs
Continued access is available to drives
in the drive enclosures that follow the failed one.
57
DE#06
IOM#0 IOM#1
DE#05
IOM#0 IOM#1
DE#04
IOM#0 IOM#1
DE#03
IOM#0 Failure IOM#1
DE#02
IOM#0 IOM#1
DE#01
IOM#0 IOM#1
CE
CM#0 CM#1
Design Guide