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Brocade 6505 on old FOS with single PSU reports BAD_FAN (MARGINAL) in MAPS

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Category:
fc-series
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san
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Applies to

  • Brocade 6505 
  • Fabric OS (FOS) v8.0.1 or lower
  • Power Supply Unit (PSU)

Issue

  • Brocade 6505 with a single PSU is alerting  a fan issue:
  • Errdump alerts:

2022/12/14-10:52:00, [MAPS-1021], 35, FID 128, WARNING, switch1, RuleName=defCHASSISBAD_FAN_MARG, Condition=CHASSIS(BAD_FAN>=1), Obj:Chassis [ BAD_FAN,1] has contributed to switch status MARGINAL.

  • mapsdb --show  alters status as MARGINAL

switch1:admin> mapsdb --show
Current Switch Policy Status: MARGINAL
Contributing Factors:
---------------------
*BAD_FAN (MARGINAL).
[...]

  • Output of psshow and fanshow is as expected:

/fabos/cliexec/psshow:
Power Supply #1 is OK
Power Supply #2 is absent

/fabos/cliexec/fanshow:
Fan 1 is Ok, speed is 8653 RPM
Fan 2 is Absent

  •  The Switch status policy is as expected for a single PSU switch. 
switch.status.policy.PowerSupplies.down = 2
switch.status.policy.PowerSupplies.marginal = 0
switch.status.policy.Fans.down:2
switch.status.policy.Fans.marginal:0

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