Loss of a single FC-to-SAS bridge

You can test the failure of a single FC-to-SAS bridge to make sure there is no single point of failure.

About this task

This test should take about 15 minutes.

This procedure has the following expected results:

Note: Starting with ONTAP 9.8, the storage bridge command is replaced with system bridge. The following steps show the storage bridge command, but if you are running ONTAP 9.8 or later, the system bridge command is preferred.

Procedure

  1. Turn off the power supplies of the bridge.
  2. Confirm that the bridge monitoring indicates an error: storage bridge show
    cluster_A::> storage bridge show
    
                                                                Is        Monitor
    Bridge     Symbolic Name Vendor  Model     Bridge WWN       Monitored Status
    ---------- ------------- ------- --------- ---------------- --------- -------
    ATTO_10.65.57.145
    	     bridge_A_1    Atto    FibreBridge 6500N
                                               200000108662d46c true      error
  3. Confirm that drives behind the bridge are available with a single path: storage disk error show
    cluster_A::> storage disk error show
    Disk             Error Type        Error Text
    ---------------- ----------------- --------------------------------------------
    1.0.0            onedomain         1.0.0 (5000cca057729118): All paths to this array LUN are connected to the same fault domain. This is a single point of failure.
    1.0.1            onedomain         1.0.1 (5000cca057727364): All paths to this array LUN are connected to the same fault domain. This is a single point of failure.
    1.0.2            onedomain         1.0.2 (5000cca05772e9d4): All paths to this array LUN are connected to the same fault domain. This is a single point of failure.
    ...
    1.0.23           onedomain         1.0.23 (5000cca05772e9d4): All paths to this array LUN are connected to the same fault domain. This is a single point of failure.