Reverse Cabling; Figure 19 Reverse Cabling - Fujitsu ETERNUS DX100 S4 Design Manual

2. Basic Functions
Data Protection

Reverse Cabling

Because the ETERNUS DX uses reverse cabling connections for data transfer paths between con-
trollers 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 that are connected after the failed drive
can be maintained because normal access paths are secured by using reverse cabling.

Figure 19 Reverse Cabling

DE#06
IOM#0
DE#05
IOM#0
DE#04
IOM#0
DE#03
IOM#0
DE#02
IOM#0
DE#01
IOM#0
CM#0
Accessible
:
Inaccessible
:
Fujitsu Storage ETERNUS DX100 S4/DX200 S4, ETERNUS DX100 S3/DX200 S3 Hybrid Storage Systems Design Guide (Basic)
IOM#1
IOM#1
A failure occurs
IOM#1
in a drive enclosure
IOM#1
IOM#1
IOM#1
CE
CM#1
Reverse cabling connection
(Connect the controller enclosure
to the last drive enclosure)
Copyright 2023 Fujitsu Limited
Continued access is available to drives
in the drive enclosures that follow the failed
one.
40
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
P3AM-7642-32ENZ0