Resume device. What is it?

Antonio Augusto (Mancha) mkhaos7 at
Mon Mar 30 16:52:42 UTC 2009

Hey Nigel,

For what i get your problem MIGHT be, indeed, related to UUID. UUID is
used as a "symbolic" name to a device, so you ca use it instead of
/dev/sda3 (which might change when you repartition your disk).
What might be happening is that the UUID of /dev/sda3 was changed
(maybe by the new install of F10?) and hence none of your OSs can find
it. You can check this by looking at /dev/disk/by-uuid and seeing if
there is a syn-link there pointing to /dev/sda3, if there is check if
its the same name as used in /etc/fstab.

The reason you see 0Mb swap may be because the UUID can't be found,
and hence no swap is activated.

To your other question: yes you can simple comment that line in fstab
and replace it with the one form arch.

Also, then you see "resume device", usually it refers to the partition
used to store the contents of the RAM when you put your computer to
hibernate (suspend do disk). Linux uses the swap space to store the
contents of the RAM, so it can resume when booted.
When you see a message like "waiting for resume device" or "resume
device not found", it simply means that Linux was not suspended to
disk, and is doing a cold boot. Nothing wrong with that.

If you have any more questions please post them.


On Mon, Mar 30, 2009 at 13:26, Nigel Henry <cave.dnb2m97pp at> wrote:
> I booted up F10 this morning, after fixing an selinux related problem
> yesterday, but the bootup stalled. I noticed an entry on the bootup messages,
> "unable to stat resume device". Not wishing to waste time on F10, as I'd had
> enough of that yesterday, I rebooted to Kubuntu Intrepid (on the same
> machine), and Intrepid hung for a few seconds with "waiting for resume
> device", then the bootup continued with no problems.
> I googled "resume device", and there are a whole bunch of hits, with folks
> having various problems with it. It appears to be referencing "swap", but why
> resume device. I would have thought that, that description applied more to
> laptops, and my machine is a PC.
> By the way, there is an entry for swap in /etc/fstab, which uses a UUID,
> rather than /dev/sda3 (which is the swap partition), but Gkrellm shows 0MB
> for swap, which indicates that swap is not on. That's on Intrepid, and fstab
> output is down a bit.
> Ok. reboot again to Archlinux on the same machine, text flashed past with no
> delays on bootup, and Gkrellm shows swap as 2000M- 2000M free, which is
> correct, and /etc/fstab output is below (Arch doesn't use UUID's).
> # /etc/fstab: static file system information
> #
> # <file system>        <dir>         <type>    <options>          <dump>
> <pass>
> none                   /dev/pts      devpts    defaults            0      0
> none                   /dev/shm      tmpfs     defaults            0      0
> /dev/cdrom /mnt/cdrom   iso9660   ro,user,noauto,unhide   0      0
> /dev/dvd /mnt/dvd   udf   ro,user,noauto,unhide   0      0
> /dev/fd0 /mnt/fd0   vfat   user,noauto   0      0
> /dev/sda3 swap swap defaults 0 0
> /dev/sda7 / ext3 defaults 0 1
> /dev/sda8 /home ext3 defaults 0 1
> /dev/sdb1 /mnt/sdb1  vfat  auto,umask=0  0 0
> The output from Kubuntu Intrepid's /etc/fstab is below.
> # /etc/fstab: static file system information.
> #
> # <file system> <mount point>   <type>  <options>       <dump>  <pass>
> proc            /proc           proc    defaults        0       0
> # /dev/sdb8
> UUID=c71a76b0-5356-41e4-ab11-4b1c05cd5a6b /               ext3
> relatime,errors=remount-ro 0       1
> # /dev/sdb9
> UUID=3e395403-02e5-4e92-9c2e-d6f7695eeaba /home           ext3    relatime
> 0       2
> # /dev/sda3
> UUID=a2bc95ec-5fe4-4651-9ca5-7027344141e3 none            swap    sw
> 0       0
> /dev/scd0       /media/cdrom0   udf,iso9660 user,noauto,exec,utf8 0       0
> # Added by me
> /dev/sdb1     /mnt/sdb1     vfat    auto,umask=0  0 0
> /dev/sdb2     /mnt/sdb2     vfat    auto,umask=0  0 0
> On the same machine, other distros show the following.
> Kubuntu Hardy 8.04. Bootup hangs a bit with "waiting for resume device", and
> once booted up, fstab shows the swap partition as a UUID, rather than
> referencing /dev/sda3, and Gkrellm shows 0M for swap.
> Gutsy Gibbon 7.10 on bootup shows "Activating swap", but Gkrellm shows 0M
> swap, and fstab is showing a UUID for the swap partition /dev/sda3.
> Dapper Drake, which was upgraded from Breezy. No problems with swap here.
> Gkrellm shows 2000M-2000M free, and fstab output below.
> # /etc/fstab: static file system information.
> #
> # <file system> <mount point>   <type>  <options>       <dump>  <pass>
> proc            /proc           proc    defaults        0       0
> /dev/sda5       /               ext3    defaults,errors=remount-ro 0       1
> /dev/sda6       /home           ext3    defaults        0       2
> /dev/sda1       /media/sda1     ext3    defaults        0       2
> /dev/sda2       /media/sda2     ext3    defaults        0       2
> /dev/sdb1       /media/sdb1     vfat    defaults        0       0
> /dev/sda3       none            swap    sw              0       0
> /dev/hda        /media/cdrom0   udf,iso9660 user,noauto     0       0
> /dev/fd0        /media/floppy0  auto    rw,user,noauto  0       0
> /dev/sdb1       /mnt/sdb1       vfat    auto,umask=0    0       0
> /dev/sdb2       /mnt/sdb2       vfat    auto,umask=0    0       0
> Again, as in the Archlinux install, no UUID's are involved specifically for
> the swap partition /dev/sda3, and Gkrellm displays the swap as 2000M-2000M
> free.
> I suppose the question has to be put, that Gkrellm cannot see the swap
> partition when UUID's are involved, rather than a direct reference to the
> swap partition /dev/sda3, where Gkrellm shows swap.
> Is there any command I can try, to see if swap is actually on, where Gkrellm
> cannot detect any swap when UUID's for the swap partition are involved?
> Alternatively, could I simply comment out the line in /etc/fstab, where swap
> is referencing a UUID, and replace it with a line referencing /dev/sda3 as
> the swap partition?
> Apologies for the long post.
> Nigel.
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