Anthony,
When you say DWDM, was it just a pure optical extender, or something like CNTs USD device. For the
former I would not expect the CHP to come online, but the USD is defined with the relevant CU
information for the DASD at the remote end. I can't remember the exact details but the local USD is
capable of generating responses to various Escon commands (maybe it was ELP) and as such maybe the
host might think they are initially online device, but then time out when the USD doesn't get a
"real" response from the device.. (caveat it was about 7 years ago when I last did USD work)
Cheers
Roy
Anthony Fletcher wrote:
At one stage we had the following scenario (simplified)
Device 1 2105-F20 - Escon CHPID 01 - Address Range 1000
Device 2 2105-F20 - Escon CHPID 02 - Address Range 2000
Both were connected to a processor with one difference, device 2 was
connected through a DWDM link.
The two devices were decommissioned and in the course of that the CHPIDs
were configed off at the processor, but the cables were left plugged in.
We then had an unplanned POR.
At IPL we had timeout errors on CHPID 02 then messages requiring
confirmation that the IPL should continue without the devices, one by one in
Address range 2000.
We had no such messages in relation to CHPID 01 and Address Range 1000.
This appears to indicate that even though there is nothing attached on the
DWDM link some status is being returned that is different.
Has anyone had this experience, and what is that status that is coming back?
----------------------------------------------------------------------
For IBM-MAIN subscribe / signoff / archive access instructions,
send email to [email protected] with the message: GET IBM-MAIN INFO
Search the archives at http://bama.ua.edu/archives/ibm-main.html
