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Thread: 2 swapfiles in /opt, but only one list in fstab?

  1. #1
    Join Date
    Oct 2004
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    407
    Distro
    Ubuntu 20.04 Focal Fossa

    2 swapfiles in /opt, but only one list in fstab?

    Hi all,

    Found 2 different sized swap files in the /opt folder:

    Code:
    root@serv:/home/adminpc# ls /opt
    lost+found  swapfile15g  swapfile20g
    root@serv:/home/adminpc#
    In the fstab file, there is only one listed:

    Code:
    /opt/swapfile20g     none            swap    sw              0       0

    Can I delete the other one?

    Regards

  2. #2
    Join Date
    Nov 2009
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    Catalunya, Spain
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    14,511
    Distro
    Ubuntu 18.04 Bionic Beaver

    Re: 2 swapfiles in /opt, but only one list in fstab?

    Probably yes. It looks like it remained from earlier and wasn't deleted when it stopped being used.

    In any case you can check active swap with the following command too, and that file will probably not be in the list of used ones:
    Code:
    swapon -s
    Darko.
    -----------------------------------------------------------------------
    Ubuntu 18.04 LTS 64bit

  3. #3
    Join Date
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    Ubuntu 20.04 Focal Fossa

    Re: 2 swapfiles in /opt, but only one list in fstab?

    Quote Originally Posted by Heeter View Post
    Can I delete the other one?
    You (or the person setting up your server) was following my tutorial with their own customizations. If you re-read the "Swap File Management" section, it shows how to add and remove swap files safely.

    LHammonds

  4. #4
    Join Date
    Oct 2004
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    407
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    Ubuntu 20.04 Focal Fossa

    Re: 2 swapfiles in /opt, but only one list in fstab?

    Hey, Guys Thank you for your responses

    It is the only one showing up on list

    Lhammonds, I did use your tutorial to set up this server. I will use your tutorial to remove the extra swapfile.

    Thank again Guys!!!!

  5. #5
    Join Date
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    Re: 2 swapfiles in /opt, but only one list in fstab?

    If you are using LVM, don't use swapfiles. Use a swap LV.

  6. #6
    Join Date
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    407
    Distro
    Ubuntu 20.04 Focal Fossa

    Re: 2 swapfiles in /opt, but only one list in fstab?

    Actually Thank you The FU

    the swapfile is sitting in the /dev/LVG/opt folder, would that be considering swapLV?

  7. #7
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    Re: 2 swapfiles in /opt, but only one list in fstab?

    Quote Originally Posted by Heeter View Post
    Actually Thank you The FU

    the swapfile is sitting in the /dev/LVG/opt folder, would that be considering swapLV?
    No. If you didn't run
    Code:
    sudo mkswap /dev/{vgname}/{lvname}
    then it isn't a swap partition/LV.

  8. #8
    Join Date
    Oct 2004
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    407
    Distro
    Ubuntu 20.04 Focal Fossa

    Re: 2 swapfiles in /opt, but only one list in fstab?

    Quote Originally Posted by TheFu View Post
    No. If you didn't run
    Code:
    sudo mkswap /dev/{vgname}/{lvname}
    then it isn't a swap partition/LV.
    Hi theFU! Thank you for responding!!!!.

    If I understand your response correctly, the current swapfile sits in the /dev/LVG/opt folder and in the fstab file, with the command that you wrote, can the swap file stay in that folder? Or does it create a new swapfile in /dev/LVG/swap?

    Just wondering if I should remove the current swapfile and remove the /dev/LVG/opt LVM?

    Thank you again for being there for me.

  9. #9
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    Re: 2 swapfiles in /opt, but only one list in fstab?

    sudo mkswap /dev/{vgname}/{lvname}

    Either you did that or you didn't.
    If you use lsblk, does it show /dev/{vgname}/{lvname} as an LV, type swap?

    Something like this?
    Code:
      ├─hadar--vg-swap_1              4.3G lvm  swap        [SWAP]
    There is no "directory" called /dev/{vgname}/{lvname}. It is a symlink to a /dev/dm-{some number}

    Code:
    $ ll /dev/hadar-vg/
    total 0
    drwxr-xr-x  2 root root  300 Oct  2 18:36 ./
    drwxr-xr-x 21 root root 4960 Oct  3 22:21 ../
    lrwxrwxrwx  1 root root    7 Oct  3 20:48 libvirt-lv -> ../dm-2
    lrwxrwxrwx  1 root root    7 Oct  3 20:48 root -> ../dm-0
    lrwxrwxrwx  1 root root    7 Oct  3 20:48 swap_1 -> ../dm-1
    I cleaned up that listing for clarity. There are many other LVs there, each pointing at a different ../dm-{some number} device.

  10. #10
    Join Date
    Oct 2004
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    Ubuntu 20.04 Focal Fossa

    Re: 2 swapfiles in /opt, but only one list in fstab?

    Hi TheFU

    Nope, it doesn't show up:

    Code:
    root@serv:/home/adminpc# lsblk
    NAME              MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
    sda                 8:0    0  1.8T  0 disk 
    └─sda1              8:1    0  1.8T  0 part /mnt/2TExternal
    sdc                 8:32   0  1.7T  0 disk 
    ├─sdc1              8:33   0  1.9G  0 part /boot
    ├─sdc2              8:34   0    1K  0 part 
    └─sdc5              8:37   0  1.6T  0 part 
      ├─LVG-root      253:0    0    4G  0 lvm  /
      ├─LVG-usr       253:1    0   10G  0 lvm  /usr
      ├─LVG-var       253:2    0    4G  0 lvm  /var
      ├─LVG-tmp       253:3    0  3.5G  0 lvm  /tmp
      ├─LVG-bak       253:4    0  7.5G  0 lvm  /bak
      ├─LVG-srv       253:5    0  3.8G  0 lvm  /srv
      ├─LVG-opt       253:6    0   52G  0 lvm  /opt
      ├─LVG-home      253:7    0  1.8G  0 lvm  /home
      └─LVG-vmstorage 253:9    0  1.6T  0 lvm  /var/vmstorage
    sr0                11:0    1 1024M  0 rom  
    sr1                11:1    1 1024M  0 rom  
    root@serv:/home/adminpc#
    Code:
    root@serv:/home/adminpc# ll /dev/LVG
    total 0
    drwxr-xr-x  2 root root  220 Oct  3 12:56 ./
    drwxr-xr-x 20 root root 4540 Oct  3 12:56 ../
    lrwxrwxrwx  1 root root    7 Oct  2 17:16 bak -> ../dm-4
    lrwxrwxrwx  1 root root    7 Oct  2 17:16 home -> ../dm-7
    lrwxrwxrwx  1 root root    7 Oct  2 17:16 opt -> ../dm-6
    lrwxrwxrwx  1 root root    7 Oct  2 17:16 root -> ../dm-0
    lrwxrwxrwx  1 root root    7 Oct  2 17:16 srv -> ../dm-5
    lrwxrwxrwx  1 root root    7 Oct  2 17:16 tmp -> ../dm-3
    lrwxrwxrwx  1 root root    7 Oct  2 17:16 usr -> ../dm-1
    lrwxrwxrwx  1 root root    7 Oct  2 17:16 var -> ../dm-2
    lrwxrwxrwx  1 root root    7 Oct  2 17:16 vmstorage -> ../dm-9
    root@serv:/home/adminpc#
    Code:
    root@serv:/home/adminpc# free -h
                  total        used        free      shared  buff/cache   available
    Mem:           94Gi         9Gi       452Mi       1.0Mi        83Gi        83Gi
    Swap:          19Gi        24Mi        19Gi
    root@serv:/home/adminpc#


    What can I do to fix this? Have to add this to the growing list of fixes on this setup, LOLOL
    Last edited by Heeter; October 4th, 2021 at 04:43 AM.

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