RE: writeups for hotplugging S/390 chandev, PNP docking stations ?

["Rick Troth" <Rick_Troth@bmc.com>]

> The hotplug script there doesn't follow the conventions of the
> linux-hotplug project; that'd involve "/etc/hotplug/chandev.agent"
> as the script doing the magic.  Which means that the network
> hotplug events will get ignored ... why is that?  Seems to me
> more natural to do network administration through network
> hotplug events, not chandev ones!  (The /sbin/hotplug script
> normally delegates the work to /etc/hotplug/$1.agent ...)
 
I can't speak to this, 
but I'm sure the S/390 subdivision of the Linux community 
would like to see it fixed. 
 
> I believe there's a bunch left unsaid there about what the
> device names indicate.  I'd hope that eth0/eth1/eth2 are all
> Ethernet, 
 
Yes. 
 
>           and that tr0 is token ring (it still lives? :), but I have
 
Token ring,  yes.   Still lives in some corners. 
 
> no clue what "ctc0" would be or, in general, how and what
> those names are.  Wouldn't disk drives show up there?
> And tape backup units, etc?
 
CTC is "channel-to-channel" which is a point-to-point thing 
conceptually like two SCSI chains having a bridge between them. 
 
Mainframe also has a network interface known as IUCV 
(iucv0, iucv1, etc),  but that has no representation in real hardware 
so I don't know if it would really fit in the "chandev" suite. 
 
> What I'll do is stick a pointer to it, and update the linux-hotplug
> webpage about "chandev" to present some of that info.  My
> understanding is that the management of mainframes has its
> own families of idiosyncracies, developed over decades, that
> it's not worth my time to master ... :)  For now I'm happy just
> to keep the subsystem information current on the web
 
Thanks for keeping it current. 
I for one very much value the commonality 
and hope that S/390 will be able to use most of this infrastructure 
rather than re-invent it. 
 


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