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Weird behavior of uuid
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Luis_POffline
Post subject: Weird behavior of uuid  PostPosted: 23.03.2013, 22:12



Joined: 2010-09-11
Posts: 171
Location: Barcelona, Spain
Status: Offline
I've realized that the uuid code of my two HD aren't the same on different boots. Here are the contents of /dev/disk/by-uuid in 2 moments of today:

This morning:
      Code:

lrwxrwxrwx 1 root root 10 mar 23 10:25 122c0f1c-9f47-475b-b460-2d6188b0c440 -> ../../sda2
lrwxrwxrwx 1 root root 10 mar 23 10:25 17405d87-e0a8-4b36-94cd-27682c750d50 -> ../../sda3
lrwxrwxrwx 1 root root 10 mar 23 10:25 41809959-28b0-449b-9deb-e1495e2b742e -> ../../sdb3
lrwxrwxrwx 1 root root 10 mar 23 10:26 91436a3a-1b66-45f9-8e50-4be8e3b4fd4f -> ../../sdb2
lrwxrwxrwx 1 root root 10 mar 23 10:25 9c20d769-2927-4bcd-bb03-73c5c384b6b2 -> ../../sdb1
lrwxrwxrwx 1 root root 10 mar 23 10:25 a29f44f5-75aa-48f8-90ad-2dc8ee1c4fb7 -> ../../sdb4
lrwxrwxrwx 1 root root 10 mar 23 10:26 d1e46756-9e15-48e1-964e-3cd1b8263f71 -> ../../sda1


This night:
      Code:

lrwxrwxrwx 1 root root 10 mar 23 22:13 122c0f1c-9f47-475b-b460-2d6188b0c440 -> ../../sdb2
lrwxrwxrwx 1 root root 10 mar 23 22:13 17405d87-e0a8-4b36-94cd-27682c750d50 -> ../../sdb3
lrwxrwxrwx 1 root root 10 mar 23 22:13 41809959-28b0-449b-9deb-e1495e2b742e -> ../../sda3
lrwxrwxrwx 1 root root 10 mar 23 22:13 91436a3a-1b66-45f9-8e50-4be8e3b4fd4f -> ../../sda2
lrwxrwxrwx 1 root root 10 mar 23 22:13 9c20d769-2927-4bcd-bb03-73c5c384b6b2 -> ../../sda1
lrwxrwxrwx 1 root root 10 mar 23 22:13 a29f44f5-75aa-48f8-90ad-2dc8ee1c4fb7 -> ../../sda4
lrwxrwxrwx 1 root root 10 mar 23 22:13 d1e46756-9e15-48e1-964e-3cd1b8263f71 -> ../../sdb1


As you can see, the sda... disk has turned into sdb... and vice-versa. It could be only a curiosity if it does not complicate a lot the administration of the system.

Any advice will be very appreciated.

Regards.

Luis_P.
 
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finottiOffline
Post subject: RE: Weird behavior of uuid  PostPosted: 23.03.2013, 23:07



Joined: 2010-09-12
Posts: 493

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I am not an expert, but if I remember well, that is exactly the point of using UUID, as sometimes the order in which HDs a recognized can change.
 
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slhOffline
Post subject: RE: Weird behavior of uuid  PostPosted: 23.03.2013, 23:39



Joined: 2010-08-25
Posts: 962

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Device detection order is (semi-)random. depending on the exact timing they're discovered during the boot/ or plug cycle; device enumeration differs accordingly, the only stable mapping is based on additional udev criterias (like UUIDs).
 
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Luis_POffline
Post subject:   PostPosted: 24.03.2013, 13:07



Joined: 2010-09-11
Posts: 171
Location: Barcelona, Spain
Status: Offline
      Quote:
Device detection order is (semi-)random


It's a pity that not be in man pages (I've been not able to find) or, better, in our manual, which speaks about "Persistent Naming by LABEL". Because that, I've lost some archives.

Thanks for your support.

Luis_P.
 
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Luis_POffline
Post subject:   PostPosted: 25.03.2013, 17:16



Joined: 2010-09-11
Posts: 171
Location: Barcelona, Spain
Status: Offline
More on this topic.

I suppose this randomness exists also for others file systems. I'm talking about the grub2 filesystem (hd0...). If so, booting with grub2 other OS is accident-prone.

The supposition arises from the fact that as a consequence of an aptosid dist-upgrade, I cannot boot my second OS (Salix, a Slackware derivative).

Luis_P.
 
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