Re: Learning about the Kernal

From	Jerry Peters <jerry@example.invalid>
Newsgroups	comp.os.linux.misc
Subject	Re: Learning about the Kernal
Date	2015-03-22 20:13 +0000
Organization	A noiseless patient Spider
Message-ID	<men7or$d6a$2@dont-email.me> (permalink)
References	(8 earlier) <mekti1$v3$2@dont-email.me> <mel14i$evu$14@reader1.panix.com> <mel1e8$ivr$1@dont-email.me> <melbtp$lov$1@reader1.panix.com> <melcd5$6b9$1@dont-email.me>

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Aragorn <thorongil@telenet.be.invalid> wrote:
> On Sunday 22 March 2015 04:11, ruben safir conveyed the following to 
> comp.os.linux.misc...
> 
>> On Sun, 22 Mar 2015 01:13:45 +0100, Aragorn wrote:
>> 
>> 
>>>> which can change from moment to moment I've learned.
>>> 
>>> Not, neither the PARTUUID nor the filesystem UUID are variable,
>> 
>> they are when you resize them, or make them for that matter...
> 
> The PARTUUID will only differ if you delete the partition and recreate 
> it, not if you resize it.  The filesystem UUID will normally only differ 
> if you reformat the partition.
> 
>> The name is completely random.
> 
> Yes, and that is exactly why it's unique [*], which is the idea.  What 
> constitutes /dev/sda1 on one day may not be the same thing again on 
> another day, depending on how the kernel enumerated the storage devices 
> in the machine at boot-up.  If you however tell the kernel that the root 
> partition is a partition with a given PARTUUID or a filesystem with a 
> given UUID, then it'll use the correct partition/filesystem.
> 
> LABELs share roughly the same function in a more human-readable format, 
> but the problem is that LABELs are not guaranteed to be unique.  LABELs 
> are assigned by the system administrator, and it is always possible for 
> the biological unit between the keyboard and the chair to screw up and 
> use duplicate LABELs.

But they're *readable*. I know what a label of 'home' means
immediately, I don't need to try to guess. So you need to be
*careful*, so what? 

> 
> [*] Unless you clone a partition or filesystem, of course.
> 
>> The naming scheme was designed by individuals who want to drive people
>> away from their computers.
> 
> That's not the point.  In terms of uniqueness and consistency at 
> mounting the right filesystems at the right places, UUID and PARTUUID 
> run rings around the old /dev/<something> designation with a radius of 
> one lightyear across.
> 
As does being a bit careful and using labels, with the added advantage
that you can tell what the partition is for, assuming you're at all
consistent in labelling them.

Thread

Learning about the Kernal ruben safir <ruben@mrbrklyn.com> - 2015-03-14 19:59 -0400
  Re: Learning about the Kernal Xavier Roche <xroche@free.fr.NOSPAM.invalid> - 2015-03-15 11:11 +0100
    Re: Learning about the Kernal ruben <nowhere@nowhere.nor> - 2015-03-15 21:14 +0000
      Re: Learning about the Kernal Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2015-03-16 10:02 +0200
        Re: Learning about the Kernal Ruben Safir <mrbrklyn@panix.com> - 2015-03-17 00:18 +0000
          Re: Learning about the Kernal Bobbie Sellers <bliss-sf4ever@dslextreme.com> - 2015-03-16 20:53 -0700
            Re: Learning about the Kernal ruben safir <dont@email.me> - 2015-03-17 05:14 +0000
            Re: Learning about the Kernal ruben safir <dont@email.me> - 2015-03-17 05:23 +0000
      Re: Learning about the Kernal Dan Espen <despen@verizon.net> - 2015-03-16 21:58 -0400
        Re: Learning about the Kernal ruben safir <dont@email.me> - 2015-03-17 05:21 +0000
          Re: Learning about the Kernal Rich <rich@example.invalid> - 2015-03-17 10:51 +0000
          Re: Learning about the Kernal Dan Espen <despen@verizon.net> - 2015-03-17 09:10 -0400
            Re: Learning about the Kernal ruben safir <ruben@mrbrklyn.com> - 2015-03-17 14:12 -0400
              Re: Learning about the Kernal William Unruh <unruh@invalid.ca> - 2015-03-17 19:03 +0000
                Re: Learning about the Kernal ruben safir <dont@email.me> - 2015-03-17 19:08 +0000
                Re: Learning about the Kernal Dan Espen <despen@verizon.net> - 2015-03-17 15:17 -0400
                Re: Learning about the Kernal ruben safir <dont@email.me> - 2015-03-20 01:06 +0000
                Re: Learning about the Kernal Dan Espen <despen@verizon.net> - 2015-03-19 23:52 -0400
                Re: Learning about the Kernal Rich <rich@example.invalid> - 2015-03-20 10:52 +0000
                Re: Learning about the Kernal Jerry Peters <jerry@example.invalid> - 2015-03-20 20:33 +0000
                Re: Learning about the Kernal ruben safir <ruben@mrbrklyn.com> - 2015-04-20 09:48 -0400
              Re: Learning about the Kernal Dan Espen <despen@verizon.net> - 2015-03-17 15:08 -0400
                Re: Learning about the Kernal ruben safir <dont@email.me> - 2015-03-18 03:36 +0000
                Re: Learning about the Kernal Dan Espen <despen@verizon.net> - 2015-03-18 10:09 -0400
                Re: Learning about the Kernal ruben safir <dont@email.me> - 2015-03-20 01:04 +0000
                Re: Learning about the Kernal Rich <rich@example.invalid> - 2015-03-20 10:58 +0000
                Re: Learning about the Kernal Dan Espen <despen@verizon.net> - 2015-03-20 09:22 -0400
                Re: Learning about the Kernal ruben safir <dont@email.me> - 2015-03-20 18:39 +0000
                Re: Learning about the Kernal Rich <rich@example.invalid> - 2015-03-20 20:04 +0000
                Re: Learning about the Kernal Dan Espen <despen@verizon.net> - 2015-03-20 21:10 -0400
                Re: Learning about the Kernal ruben safir <dont@email.me> - 2015-03-21 05:03 +0000
                Re: Learning about the Kernal ruben safir <dont@email.me> - 2015-03-20 18:42 +0000
                Re: Learning about the Kernal Dan Espen <despen@verizon.net> - 2015-03-20 15:31 -0400
                Re: Learning about the Kernal ruben safir <dont@email.me> - 2015-03-21 05:13 +0000
                Re: Learning about the Kernal The Natural Philosopher <tnp@invalid.invalid> - 2015-03-21 09:13 +0000
                Re: Learning about the Kernal ruben <nowhere@nowhere.nor> - 2015-03-21 14:40 +0000
                Re: Learning about the Kernal Michael Black <et472@ncf.ca> - 2015-03-21 12:20 -0400
                Re: Learning about the Kernal ruben safir <dont@email.me> - 2015-03-21 19:54 +0000
                Re: Learning about the Kernal Baho Utot <baho-utot@columbus.rr.com> - 2015-03-21 17:56 -0400
                Re: Learning about the Kernal ruben safir <dont@email.me> - 2015-03-21 19:56 +0000
                Re: Learning about the Kernal Richard Kettlewell <rjk@greenend.org.uk> - 2015-03-21 16:18 +0000
          Re: Learning about the Kernal Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2015-03-17 16:10 +0200
            Re: Learning about the Kernal ruben safir <ruben@mrbrklyn.com> - 2015-03-17 14:06 -0400
              Re: Learning about the Kernal William Unruh <unruh@invalid.ca> - 2015-03-17 19:00 +0000
                Re: Learning about the Kernal Tim Watts <tw_usenet@dionic.net> - 2015-03-17 19:05 +0000
                Re: Learning about the Kernal Bobbie Sellers <bliss-sf4ever@dslextreme.com> - 2015-03-17 14:17 -0700
                Re: Learning about the Kernal William Unruh <unruh@invalid.ca> - 2015-03-19 06:04 +0000
                Re: Learning about the Kernal ruben safir <dont@email.me> - 2015-03-21 08:45 +0000
                Re: Learning about the Kernal ruben safir <dont@email.me> - 2015-03-21 08:20 +0000
                Re: Learning about the Kernal Rich <rich@example.invalid> - 2015-03-21 16:09 +0000
                Re: Learning about the Kernal ruben safir <dont@email.me> - 2015-03-21 20:10 +0000
              Re: Learning about the Kernal Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2015-03-17 22:39 +0200
          Re: Learning about the Kernal Chick Tower <c.tower@deadspam.com> - 2015-03-18 03:35 +0000
            Re: Learning about the Kernal ruben safir <dont@email.me> - 2015-03-21 08:47 +0000
              Re: Learning about the Kernal Jerry Peters <jerry@example.invalid> - 2015-03-21 20:19 +0000
                Re: Learning about the Kernal ruben safir <dont@email.me> - 2015-03-21 20:30 +0000
                Re: Learning about the Kernal Jerry Peters <jerry@example.invalid> - 2015-03-22 20:05 +0000
                Re: Learning about the Kernal ruben safir <ruben@mrbrklyn.com> - 2015-03-23 01:16 -0400
                Re: Learning about the Kernal Jerry Peters <jerry@example.invalid> - 2015-03-23 20:27 +0000
                Re: Learning about the Kernal ruben safir <dont@email.me> - 2015-03-25 02:57 +0000
                Re: Learning about the Kernal ruben safir <dont@email.me> - 2015-03-25 02:59 +0000
                Re: Learning about the Kernal Jerry Peters <jerry@example.invalid> - 2015-03-25 20:59 +0000
                Re: Learning about the Kernal ruben safir <ruben@mrbrklyn.com> - 2015-04-20 09:44 -0400
                Re: Learning about the Kernal Aragorn <thorongil@telenet.be.invalid> - 2015-03-22 00:07 +0100
                Re: Learning about the Kernal ruben safir <dont@email.me> - 2015-03-22 00:07 +0000
                Re: Learning about the Kernal Aragorn <thorongil@telenet.be.invalid> - 2015-03-22 01:13 +0100
                Re: Learning about the Kernal ruben safir <dont@email.me> - 2015-03-22 03:11 +0000
                Re: Learning about the Kernal Aragorn <thorongil@telenet.be.invalid> - 2015-03-22 04:20 +0100
                Re: Learning about the Kernal ruben safir <dont@email.me> - 2015-03-22 13:19 +0000
                Re: Learning about the Kernal Rich <rich@example.invalid> - 2015-03-22 15:13 +0000
                Re: Learning about the Kernal Aragorn <thorongil@telenet.be.invalid> - 2015-03-22 21:52 +0100
                Re: Learning about the Kernal Jerry Peters <jerry@example.invalid> - 2015-03-22 20:13 +0000
                Re: Learning about the Kernal Aragorn <thorongil@telenet.be.invalid> - 2015-03-22 22:01 +0100
              Re: Learning about the Kernal Chick Tower <c.tower@deadspam.com> - 2015-03-23 04:02 +0000
                Re: Learning about the Kernal Aragorn <thorongil@telenet.be.invalid> - 2015-03-23 05:13 +0100
                Re: Learning about the Kernal ruben <ceo@iran.gov> - 2015-04-12 13:03 +0000
      Re: Learning about the Kernal ruben safir <dont@email.me> - 2015-03-17 05:18 +0000
      Re: Learning about the Kernal ruben safir <ruben@mrbrklyn.com> - 2015-03-17 01:52 -0400

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