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Reverse Cabling
Because the ETERNUS AF 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 15
Reverse Cabling (ETERNUS AF650 S3)
CM#0
CM#1
CE
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
CE
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)
Continued access is available to drives
in the drive enclosures that follow the failed one.
A failure occurs
in a drive enclosure
:
Accessible
:
Inaccessible
2. Basic Functions
Data Protection
41
Design Guide
Summary of Contents for ETERNUS AF S3 Series
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