> I think we would have swapped the cards without varying off the channel.
> Possibly a mid-flight I/O hung Linux. That was SuSE8 / Linux 2.4x kernel.
2.4 might have still had some problems in this area.
> BTW, how do you start/stop the channels?
>
> I see /sys/devices/css0/chp0.2e/status and
> /sys/devices/css0/chp0.2e/detach_state
>
> How do I vary on / vary off the channel?
detach_state is an attribute generated by the driver core (not specific
to our stuff) and has been removed in later kernels.
Use echo {on,off} > /sys/devices/css0/chp0.2e/status to vary the chpid.
(The on/off comes from the 2.4 /proc/chpids interface.)
Cornelia
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