[f-nsp] Log error on an RX-4 running 2703.a: bad i2c access

[Niels Bakker]

* dave at terabitsystems.com (Dave Peters) [Tue 26 Apr 2011, 00:40 CEST]:
>Apr 25 23:14:47:I:System: bad i2c access (GIEI = set), Severity Minor, Mux 0x70, Channel 4, Addr 0x22 (FANTRAY1)
>Apr 25 23:14:47:I:System: last good i2c access, Mux index 0x70, channel 5, Addr 0xd (PS2)
>
>This suggests the fan tray is bad, but a show chassis gives me the 
>thumbs up.  Anyone have any experience with this?

PS2 didn't release the I2C bus.  This is likely a bug in the firmware 
of the power supply.  Brocade put some workaround code in later 
versions for MLX, don't know about similar in RX but assume it's there 
too, should be around the 2.7.02 timeframe, which you're beyond anyway.

"Minor" I2C errors are recoverable and will generally only hang around 
until the next "show chassis" or similar access is executed.  "Major" 
I2C errors will require manual intervention to unstick the I2C bus. 
It's annoying when that happens because the SNMP process hangs if 
temperatures get polled, causing all snmp-based stats to go fubar.

I've not seen "Major" error messages in several months now and only 
the odd "Minor" ones, but those have become increasingly rare as older 
hardware gets swapped out.

If the issue happens frequently you may wish to ask Brocade for a new 
power supply, assuming you have a support contract on the chassis.
Remember to first unplug the power cord before removing the PSU.


	-- Niels.

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