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