* Re: writeups for hotplugging S/390 chandev, PNP docking stations?
2002-04-01 22:23 writeups for hotplugging S/390 chandev, PNP docking stations? David Brownell
@ 2002-04-02 15:30 ` Rick Troth
2002-04-02 16:34 ` writeups for hotplugging S/390 chandev, PNP docking stations Post, Mark K
2002-04-03 3:44 ` writeups for hotplugging S/390 chandev, PNP docking stations? David Brownell
2 siblings, 0 replies; 4+ messages in thread
From: Rick Troth @ 2002-04-02 15:30 UTC (permalink / raw)
To: linux-hotplug
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
2002-04-01 22:23 writeups for hotplugging S/390 chandev, PNP docking stations? David Brownell
2002-04-02 15:30 ` Rick Troth
@ 2002-04-02 16:34 ` Post, Mark K
2002-04-03 3:44 ` writeups for hotplugging S/390 chandev, PNP docking stations? David Brownell
2 siblings, 0 replies; 4+ messages in thread
From: Post, Mark K @ 2002-04-02 16:34 UTC (permalink / raw)
To: linux-hotplug
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. :-(
_______________________________________________
Linux-hotplug-devel mailing list http://linux-hotplug.sourceforge.net
Linux-hotplug-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/linux-hotplug-devel
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: writeups for hotplugging S/390 chandev, PNP docking stations?
2002-04-01 22:23 writeups for hotplugging S/390 chandev, PNP docking stations? David Brownell
2002-04-02 15:30 ` Rick Troth
2002-04-02 16:34 ` writeups for hotplugging S/390 chandev, PNP docking stations Post, Mark K
@ 2002-04-03 3:44 ` David Brownell
2 siblings, 0 replies; 4+ messages in thread
From: David Brownell @ 2002-04-03 3:44 UTC (permalink / raw)
To: linux-hotplug
> > 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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