故障log：

%C4K_IOSMODPORTMAN-4-POWERSUPPLYBAD: Power supply 2 has failed or been turned off

在单机的情况下，我们可以很容易的判断是哪一个Power Supply故障了，但是在VSS环境下，没有注意过这类log，可能有点迷糊，这哦Power supply 2是指Switch 1的PS呢还是Switch 2呢？

实际情况如下：

如果是Standby的电源故障了，会是如下情况：

*May  1 09:23:45.234: %C4K_IOSMODPORTMAN-4-POWERSUPPLYBAD: STANDBY:Power supply 2 has failed or been turned off
*May  1 09:23:50.252: %C4K_IOSMODPORTMAN-6-POWERSUPPLYGOOD: STANDBY:Power supply 2 is okay

如果是Active的电源故障了，会是如下情况：

*Dec 09 18:57:08.526: %C4K_IOSMODPORTMAN-4-POWERSUPPLYBAD: Power supply 2 has failed or been turned off
*Dec 09 18:57:13.527: %C4K_IOSMODPORTMAN-6-POWERSUPPLYGOOD: Power supply 2 is okay

另外，我们也可以通过show power detail命令去判断：

Power fail interrupts received on slot 1: 0
Power fail interrupts received on slot 2:

.......

以及Watts Used of System Power

Watts used of Chassis Inline Power

查看PS故障的信息，可以通过如下命令：

show clock
show ver
show env
show power detail
show log

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