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Thread: Swap memory not available

  1. #1
    Join Date
    Sep 2012
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    Swap memory not available

    Hi, I installed ubuntu 12.04 on a flash drive 8Gb with following partitions :

    • 1 Gb -> NTFS
    • 1 Gb -> Swap memory
    • rest -> ext4 mounted as /

    The problem is when I boot into the flash drive and open system monitor, it says that swap memory is not available. Does swap memory can't be installed on flash drive?

    Thanks in advance!

  2. #2
    Join Date
    Jul 2007
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    Reykjavík, Iceland
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    Ubuntu 10.04 Lucid Lynx

    Re: Swap memory not available

    You should be able to see the swap partition within this file /etc/fstab. The file should contain something like this
    Code:
    # swap was on /dev/sda5 during installation
    UUID=1237f085-1709-424e-a469-f40a9ddf5e1c none            swap    sw              0       0
    To enable the swap from this file write the following into the terminal
    Code:
    swapon -a
    To know the current status of the swap (in use) type this into the terminal
    Code:
    swapon -s
    The output of swapon -s should be something like this
    Code:
    $ swapon -s
    Filename                Type        Size    Used    Priority
    /dev/sda5                               partition    7550508    518968    -1
    *added*
    Ask yourself if you really need a swap partition. The main reasons for using swap is if you do not have a sufficient amount of ram compared to your peak usage, and also if you hibernate the computer (move everything from ram onto swap until you'll turn the computer on again). If you do not really need a swap partition you should consider merging that partition with one of your other partitions.
    Last edited by Bölvağur; January 15th, 2013 at 02:53 PM.

  3. #3
    Join Date
    Nov 2008
    Location
    Magdalena,New Mexico,USA
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    Ubuntu 14.04 Trusty Tahr

    Re: Swap memory not available

    Is it possible to force a swap partition to be enabled at boot??

    When I installed 12.04 from a Live CD it assigned swap to sda5, but
    only assigned 8MB to it for some reason....I need to go to gparted
    to turn on swap on sda6 which gives me an additional 2GB for swap.

    I would like to have sda6 assigned as swap at boot so I don't have
    to go thru the additional steps as I only have 1GB of RAM at the
    present & if I forget to assign sda6, then my sys freezes because
    of heavy usage...

    results of cat /etc/fstab & swapon -s below

    TIA,

    Tommy


    tommy2@tommy-Inspiron-531s:~$ cat /etc/fstab
    # /etc/fstab: static file system information.
    #
    # Use 'blkid' to print the universally unique identifier for a
    # device; this may be used with UUID= as a more robust way to name devices
    # that works even if disks are added and removed. See fstab(5).
    #
    # <file system> <mount point> <type> <options> <dump> <pass>
    proc /proc proc nodev,noexec,nosuid 0 0
    # / was on /dev/sda8 during installation
    UUID=b6d65084-87db-4eff-b51e-17e13bd8f808 / ext4 errors=remount-ro 0 1
    # swap was on /dev/sda5 during installation
    UUID=8ab28302-3d42-49ea-9a00-4d6101a3f1a1 none swap sw 0 0



    tommy2@tommy-Inspiron-531s:~$ swapon -s
    Filename Type Size Used Priority
    /dev/sda5 partition 7996 7960 -1
    /dev/sda6 partition 2196476 436636 -2
    tommy2@tommy-Inspiron-531s:~$
    Last edited by NM5TF; January 15th, 2013 at 06:34 PM. Reason: added results
    Registered Linux User # 529389
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  4. #4
    Join Date
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    Re: Swap memory not available

    If you run

    Code:
    sudo blkid
    you should then be able to see the UUID for the swap

    then edit /etc/fstab as root and make sure the swap referenced there matches.

    If you're not sure then give us the results of

    Code:
    sudo blkid
    cat /etc/fstab
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  5. #5
    Join Date
    Nov 2008
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    Re: Swap memory not available

    Quote Originally Posted by Elfy View Post
    If you run

    Code:
    sudo blkid
    you should then be able to see the UUID for the swap

    then edit /etc/fstab as root and make sure the swap referenced there matches.

    If you're not sure then give us the results of

    Code:
    sudo blkid
    cat /etc/fstab

    can I just edit /etc/fstab to add the UUID for sad6 to make it
    available at boot...is it really that simple???

    the cat /etc/fstab result is AFTER I manually turned on sda6
    with gparted....

    Code:
    tommy2@tommy-Inspiron-531s:~$ sudo blkid
    [sudo] password for tommy2: 
    /dev/sda5: UUID="8ab28302-3d42-49ea-9a00-4d6101a3f1a1" TYPE="swap" 
    /dev/sda6: UUID="87a4586c-7df5-4287-bf2e-af70ffafe7b7" TYPE="swap" 
    /dev/sda7: LABEL="Ubuntu 12.04 LTS" UUID="b6d65084-87db-4eff-b51e-17e13bd8f808" TYPE="ext4" 
    tommy2@tommy-Inspiron-531s:~$ cat /etc/fstab
    # /etc/fstab: static file system information.
    #
    # Use 'blkid' to print the universally unique identifier for a
    # device; this may be used with UUID= as a more robust way to name devices
    # that works even if disks are added and removed. See fstab(5).
    #
    # <file system> <mount point>   <type>  <options>       <dump>  <pass>
    proc            /proc           proc    nodev,noexec,nosuid 0       0
    # / was on /dev/sda8 during installation
    UUID=b6d65084-87db-4eff-b51e-17e13bd8f808 /               ext4    errors=remount-ro 0       1
    # swap was on /dev/sda5 during installation
    UUID=8ab28302-3d42-49ea-9a00-4d6101a3f1a1 none            swap    sw              0       0
    Tommy
    Registered Linux User # 529389
    Ubuntu 12.04.4 LTS, Ubuntu 14.04 LTS, Debian 7.6 Wheezy, Linux Mint 17 Development Release
    my new & improved web page http://users.gilanet.com/~tfrost

  6. #6
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    Re: Swap memory not available

    is it really that simple???
    should be

    you can even use both if you want to, backup and edit the file

    Code:
    sudo cp /etc/fstab /etc/fstab.bak
    Code:
    gksudo gedit /etc/fstab
    Then either change

    Code:
    UUID=8ab28302-3d42-49ea-9a00-4d6101a3f1a1 none swap sw  0       0
    to

    Code:
    UUID=87a4586c-7df5-4287-bf2e-af70ffafe7b7 none swap sw  0       0
    or add the same line AFTER the existing one to use both swaps

    then save the file

    Code:
    sudo swapoff -a && sudo swapon -a
    then
    Code:
    free -m
    to check the swap was recognised ok, should then be there on each reboot
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  7. #7
    Join Date
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    Re: Swap memory not available

    looks like it worked great...

    thanx Elfy...

    I LOVE this Forum!!!

    Tommy
    Registered Linux User # 529389
    Ubuntu 12.04.4 LTS, Ubuntu 14.04 LTS, Debian 7.6 Wheezy, Linux Mint 17 Development Release
    my new & improved web page http://users.gilanet.com/~tfrost

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