6760 ServerNet/DA Manual

Migrating Data From a D-Series Release
6760 ServerNet/DA Manual—424879-003
D-7
Example: Mismatched Fiber-Optic Cables
Figure D-3 shows how the disk drives could be incorrectly cabled. Notice that the
configured primary path is actually cabled to the mirror disk and that the configured
mirror path is actually cabled to the primary disk. This incorrect cabling could
adversely affect fault tolerance and data integrity.
Figure D-2. Configured Cable Paths (How Disk Modules Should Be Cabled)
Figure D-3. Actual Cable Paths (Does Not Match Configuration)
013CDT .CDD
BEB
BEB
BEB
BEB
SAC 4
SAC 3
SAC 2
SAC 1
6760 Adapter
SAC 4
SAC 3
SAC 2
SAC 1
6760 Adapter
$DISK02 - P
$DISK02 - M
Slot 53
Slot 54
Primary
MBackup
Mirror
Backup
Slot 0
Slot 0
Disk Module B1
Disk Module A1
017CDT .CDD
BEB
BEB
BEB
BEB
SAC 4
SAC 3
SAC 2
SAC 1
6760 Adapter
SAC 4
SAC 3
SAC 2
SAC 1
6760 Adapter
$DISK02 - P
$DISK02 - M
Slot 53
Slot 54
Primary
MBackup
Mirror
Backup
Slot 0
Slot 0
Disk Module B1
Disk Module A1