Fujitsu PRIMERGY TX2550 M4 Upgrade And Maintenance Manual page 200

Hard disk drive (HDD) / solid state drive (SSD)
Removing the SAS backplane
Figure 118: Numbering SAS backplanes
Pos. Component
1 SAS backplane 1
2 SAS backplane 2
3 SAS backplane 3
4 SAS backplane 4
Ê Disconnect all cables from the corresponding SAS backplane.
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Upgrade and Maintenance Manual TX2550 M4