[Bug 1516225] Re: Swapon does not respect fstab priorities order

[jean-christophe manciot]

I have to manually change the swap priorities after each boot to get the
right order.

You are right: using the swap paths in /etc/fstab instead of UUIDs gives
the configured priority to the right swap.

Now you know where to look in the code to correct that issue, because
the interesting thing about UUIDs is that the location of the devices
can change between boots, which is my use case.

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https://bugs.launchpad.net/bugs/1516225

Title:
  Swapon does not respect fstab priorities order

Status in util-linux package in Ubuntu:
  Invalid

Bug description:
  uname -a
  Linux msi-ge60-ubuntu 4.2.0-18-generic #22-Ubuntu SMP Fri Nov 6 18:25:50 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

  
  sudo swapon --summary
  Filename				        Type		Size	                Used	Priority
  /dev/sdc2                              	partition	50331644	0	        -1
  /dev/sda6                              	partition	50331644	0	        -2

  However, in /etc/fstab:
  # swap was on /dev/sda6 during installation
  UUID=4870beef-bb2c-40c1-91da-f1444f90c51b none            				swap    sw,nofail,pri=-1  0       0

  # swap on SSD Samsung  /dev/sdc2
  UUID=fa2b8ce4-6ce7-4fb2-ac12-475264bed20f none            				swap    sw,nofail,pri=-2  0       0

  Does the fact that sdc2 is a SSD makes swapon override the fstab priorities? 
  It is suspicious that swapon prints sdc2 first in the summary. despite the following facts:
  - sdc2 priority is -2 in fstab
  - sdc2 is declared after sda2 in fstab
  - sdc2 is after sda2 in alphabetical order

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