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

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

[David Brownell]

I notice that those two subsystems are now hotplug
enabled ... chandev in both 2.4 and 2.5, and the
docking station support in 2.5.7 (and maybe earlier).

Anyone know where there are writeups for those?
I want to keep the website reasonably complete
with regards to hotplug support in "official" kernels.
Documentation/s390/chandev.8 talks a bit about
that, but it's rather cryptic.  And I didn't see any
info about the docking station support.

Also, let us know if there are hotplug scripts that
should be incorporated into the standard toolset.

I'd suspect they'd be more generally useful for the
laptop docking stations than for the mainframes,
but I could easily get surprised!  :)

- Dave

http://linux-hotplug.sourceforge.net






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

[Rick Troth]

I've sent to Mark Post,  one of the info reference people 
in the S/390 (aka: zSeries) community.   Mark should be able to 
recommend someone who can clear-up the description.   This "chandev.8" 
probably came out of the lab that produces most of the S/390 patches. 
Their focus is on code,  I'm sure,  not doc.   But someone who 
understands the princ. of ops can probably make it plain. 
 
> Also, let us know if there are hotplug scripts that
> should be incorporated into the standard toolset.
> 
> I'd suspect they'd be more generally useful for the
> laptop docking stations than for the mainframes,
> but I could easily get surprised!  :)
 
Surprise!   The mainframe plugs and un-plugs all the time. 
Devices get  "varied online"  (or offline)  on demand. 
The situation only gets worse when you're running Linux in a 
virtual machine where one could  'hcp attach'  (or detach) 
things on-the-fly,  both virtual and real.   It's fun! 
 
Let's just say that the mainframe Linux crowd 
has been waiting for hotplug for a long time.   :-) 
Rebooting just to recognize a dynamic device is ... sub-optimal.   :-( 
 



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

[Post, Mark K]

Rick, Dave,

I read the chandev.8 file, and while it's pretty poorly formatted, the
information seems relatively good, if presented in a scattered manner.  As
you commented, the developers are probably concentrating on code for the
most part.

I normally use the "Device Drivers and Installation Commands" document when
I want to refresh my memory on a particular command for a particular type of
device.
(http://www10.software.ibm.com/developerworks/opensource/linux390/docu/l390d
d07.pdf)  This seems pretty clear and reasonably well-written.  If Dave
finds this more acceptable, then I guess we're done.  Otherwise, I would
have to think about who might be willing to translate the chandev.8 file
into something more coherent.

Mark

-----Original Message-----
From: Rick Troth [mailto:rtroth@bmc.com]
Sent: Tuesday, April 02, 2002 10:30 AM
To: David Brownell
Cc: linux-hotplug-devel@lists.sourceforge.net; mark.post@eds.com
Subject: Re: writeups for hotplugging S/390 chandev, PNP docking
stations?


I've sent to Mark Post,  one of the info reference people 
in the S/390 (aka: zSeries) community.   Mark should be able to 
recommend someone who can clear-up the description.   This "chandev.8" 
probably came out of the lab that produces most of the S/390 patches. 
Their focus is on code,  I'm sure,  not doc.   But someone who 
understands the princ. of ops can probably make it plain. 
 
> Also, let us know if there are hotplug scripts that
> should be incorporated into the standard toolset.
> 
> I'd suspect they'd be more generally useful for the
> laptop docking stations than for the mainframes,
> but I could easily get surprised!  :)
 
Surprise!   The mainframe plugs and un-plugs all the time. 
Devices get  "varied online"  (or offline)  on demand. 
The situation only gets worse when you're running Linux in a 
virtual machine where one could  'hcp attach'  (or detach) 
things on-the-fly,  both virtual and real.   It's fun! 
 
Let's just say that the mainframe Linux crowd 
has been waiting for hotplug for a long time.   :-) 
Rebooting just to recognize a dynamic device is ... sub-optimal.   :-( 
 


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

[David Brownell]

> > Also, let us know if there are hotplug scripts that
> > should be incorporated into the standard toolset.
> > 
> > I'd suspect they'd be more generally useful for the
> > laptop docking stations than for the mainframes,
> > but I could easily get surprised!  :)
>  
> Surprise!   The mainframe plugs and un-plugs all the time. 

... actually I meant that in the sense that there are
more Linux laptops than Linux mainframes ... though
I'm sure some vendors would gladly change that
particular dynamic!  :)


> Let's just say that the mainframe Linux crowd 
> has been waiting for hotplug for a long time.   :-) 
> Rebooting just to recognize a dynamic device
> is ... sub-optimal.   :-( 

I seem to recall mentioning that to Linus way back
when I did the initial version of hotplug.  As you
imply, high availability servers need to really value
their uptime, and "hot" reconfiguration is key to
getting past just "five nines" into _really_ high
system availability ... 

- Dave




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