Re: help with grub command sought

From	"Charles T. Smith" <cts.private.yahoo@gmail.com>
Newsgroups	comp.os.linux.setup, comp.os.linux.portable
Subject	Re: help with grub command sought
Date	2014-06-22 13:38 +0000
Organization	A noiseless patient Spider
Message-ID	<lo6m9d$a49$1@dont-email.me> (permalink)
References	(1 earlier) <lo4otd$qh6$1@dont-email.me> <lo6alk$f2q$1@dont-email.me> <lo6dql$1tse$1@saria.nerim.net> <lo6hku$q2u$1@dont-email.me> <lo6k15$2022$1@saria.nerim.net>

Cross-posted to 2 groups.

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On Sun, 22 Jun 2014 15:00:21 +0200, Pascal Hambourg wrote:

> Charles T. Smith a écrit :
>> 
>> The thing is, I *am* using persistent names - that's what I meant with
>> / dev/disk/by-id.  But if you look at those, e.g. with ls -l, you'll
>> see they're just symlinks to the /dev/sd* devices, which I guess are
>> determined by the kernel - then something else maps them to the
>> /dev/disk/ by-id names at a later time in the boot process...
> 
> The something is udev.
> 
>> What I'm observing is apparently that the *underlying* device special
>> file mapped to the usb controller is being re-established - but not the
>> persistent link.
>> 
>> The event I'm talking about is this power-down event or whatever it is.
>> I haven't pinned down exactly what it is.  I just went to lunch for 45
>> minutes or so, and the mapping stayed unchanged.  But sometimes, it
>> happens quickly...  I'm pretty sure it happens immediately if I close
>> the cover to my laptop.
> 
> This usually triggers some form of system suspend, and resume when you
> open the cover again.
> 
> However what you describe here is rather different from what you wrote
> in your initial post ("the disk won't normally boot") and does not seem
> to have anything to do with grub.


Yikes!  You're right!

I had two queries pending - one to comp.os.linux.hardware ("usb external 
drives not reliable for linux?").  I updated the wrong one with new 
information :(

Sorry for the confusion.  And thanks for the point about udev updating 
the by-id links.

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Thread

help with grub command sought "Charles T. Smith" <cts.private.yahoo@gmail.com> - 2014-06-21 11:03 +0000
  Re: help with grub command sought "Charles T. Smith" <cts.private.yahoo@gmail.com> - 2014-06-21 20:11 +0000
    Re: help with grub command sought "Charles T. Smith" <cts.private.yahoo@gmail.com> - 2014-06-22 10:20 +0000
      Re: help with grub command sought Pascal Hambourg <boite-a-spam@plouf.fr.eu.org> - 2014-06-22 13:14 +0200
        Re: help with grub command sought "Charles T. Smith" <cts.private.yahoo@gmail.com> - 2014-06-22 12:19 +0000
          Re: help with grub command sought Pascal Hambourg <boite-a-spam@plouf.fr.eu.org> - 2014-06-22 15:00 +0200
            Re: help with grub command sought "Charles T. Smith" <cts.private.yahoo@gmail.com> - 2014-06-22 13:38 +0000
              Re: help with grub command sought Doug Laidlaw <laidlaws@hotkey.net.au> - 2014-06-23 15:58 +1000
    Re: help with grub command sought Doug Laidlaw <laidlaws@hotkey.net.au> - 2014-06-22 23:27 +1000

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