writeups for hotplugging S/390 chandev, PNP docking stations?
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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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.
Quoted 6 lines
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
In reply to David BrownellRick, 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:[email protected]]
Sent: Tuesday, April 02, 2002 10:30 AM
To: David Brownell
Cc: [email protected]; [email protected]
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.
Quoted 6 lines
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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Linux-hotplug-devel mailing list http://linux-hotplug.sourceforge.net
[email protected]
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Quoted 8 lines
Quoted 6 lines
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! :)
Quoted 4 lines
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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