Cabling the bridge SAS ports when consolidating storage behind FibreBridge 7600N bridge

When consolidating multiple SAS storage stacks behind a single pair of FibreBridge 7600N bridge with available SAS ports, you must move the top and bottom SAS cables to the new bridges.

About this task

The FibreBridge 6500N bridge SAS ports use QSFP connectors. The FibreBridge 7600N bridge SAS ports use mini-SAS connectors.

Attention

If you insert a SAS cable into the wrong port, when you remove the cable from a SAS port, you must wait at least 120 seconds before plugging the cable into a different SAS port. If you fail to do so, the system will not recognize that the cable has been moved to another port.

Note

Wait at least 10 seconds before connecting the port. The SAS cable connectors are keyed; when oriented correctly into a SAS port, the connector clicks into place and the disk shelf SAS port LNK LED illuminates green. For disk shelves, you insert a SAS cable connector with the pull tab oriented down (on the underside of the connector).

Remove the cable that connects the SAS A port of the top FibreBridge 6500N bridge to the top SAS shelf, being sure to note the SAS port on the storage shelf to which it connects.
The cable is shown in blue in the following example:
Using a cable with a mini-SAS connector, connect the same SAS port on the storage shelf to the SAS B port of the top FibreBridge 7600N bridge.
The cable is shown in blue in the following example:
Remove the cable that connects the SAS A port of the bottom FibreBridge 6500N bridge to the top SAS shelf, being sure to note the SAS port on the storage shelf to which it connects.
This cable is shown in green in the following example:
Using a cable with a mini-SAS connector, connect the same SAS port on the storage shelf to the SAS B port of the bottom FibreBridge 7600N bridge.
This cable is shown in green in the following example:

Confirm connectivity to the bridge-connected disks: run local sysconfig -v

The output shows the disks attached to the initiator ports on the controller, and identifies the shelves connected to the FC-to-SAS bridges:

Example

node_A_1> run local sysconfig -v
Lenovo Release 9.6P5: Fri Dec 13 13:23:47 EST 2019
System ID: 0536872165 (node_A_1); partner ID: 0536872141 (node_B_1)
System Serial Number: 940001025465 (node_A_1)
System Rev: A4
System Storage Configuration: Multi-Path HA<=== Configuration should be multi-path HA
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slot 0: FC Host Adapter 0g (QLogic 8324 rev. 2, N-port, <UP>)<=== Initiator port
Firmware rev:      7.5.0
Flash rev:         0.0.0
Host Port Id:      0x60100
FC Node Name:      5:00a:098201:bae312
FC Port Name:      5:00a:098201:bae312
SFP Vendor:        FINISAR CORP.
SFP Part Number:   FTLF8529P3BCVAN1
SFP Serial Number: URQ0R1R
SFP Capabilities:  4, 8 or 16 Gbit
Link Data Rate:    16 Gbit
Switch Port:       brcd6505-fcs40:1
  <List of disks visible to port>
 ID     Vendor   Model            FW    Size
brcd6505-fcs40:12.126L1527     : LENOVO   X302_HJUPI01TSSM NA04 847.5GB (1953525168 512B/sect)
brcd6505-fcs40:12.126L1528     : LENOVO   X302_HJUPI01TSSA NA02 847.5GB (1953525168 512B/sect)
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<List of FC-to-SAS bridges visible to port>
FC-to-SAS Bridge:
brcd6505-fcs40:12.126L0        : ATTO     FibreBridge7600N A30H  FB7600N100104
brcd6505-fcs42:13.126L0        : ATTO     FibreBridge7600N A30H  FB7600N100104
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  <List of storage shelves visible to port>
brcd6505-fcs40:12.shelf6: DS4243  Firmware rev. IOM3 A: 0200  IOM3 B: 0200
brcd6505-fcs40:12.shelf8: DS4243  Firmware rev. IOM3 A: 0200  IOM3 B: 0200
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Remove the old FibreBridge 6500N bridges that are no longer connected to the SAS storage.
Wait two minutes for the system to recognize the changes.
If the system was miscabled, remove the cable, correct the cabling, and then reconnect the correct cable.
If necessary, repeat the preceding steps to move up to two additional SAS stacks behind the new FibreBridge 7600N bridge, using SAS ports C and then D.
Each SAS stack must be connected to the same SAS port on the top and bottom bridge. For example, if the top connection of the stack is connected to the top bridge SAS B port, the bottom connection must be connected to the SAS B port of the bottom bridge.

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