It is Brocade DCX8510-4 connected to IBM z13 FICON Express16S. The message is exactly as I wrote: "Invalid attachment failure". This is on Channel icon on SE. There is no message on swtich side.

@Roger
It is unlikely the problem come from dirty fiber. The problem regards two channels, we also changed the cable for one of them.

--
Radoslaw Skorupka
Lodz, Poland






W dniu 2018-08-23 o 07:11, Alan(GMAIL)Watthey pisze:
Radoslaw,

What are we talking about here?  Cisco or Brocade?  Which model?  What was
the 'exact' message logged in the switch itself?

Regards,
Alan Watthey

-----Original Message-----
From: R.S. <r.skoru...@bremultibank.com.pl>
Sent: 22 August 2018 1:17 pm
Subject: FICON "Invalid attachment failure"

Two FICON channels were connected to a switch.
Both signal an error "Invalid attachment failure" (this is visible on SE)
I checked port#, zoning, HCD/IODF and have no idea what to check futher.
z13 FICON Express16S, DCX8510-4 with 8Gbps SFP.


Any clue?



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