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

[Heeter]

Hi all,

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

root@serv:/home/adminpc# ls /opt
lost+found  swapfile15g  swapfile20g
root@serv:/home/adminpc#

In the fstab file, there is only one listed:

/opt/swapfile20g     none            swap    sw              0       0

Can I delete the other one?

Regards

[darkod]

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:

swapon -s

[LHammonds]

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

[Heeter]

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!!!!

[TheFu]

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

[Heeter]

Actually Thank you The FU

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

[TheFu]

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

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

then it isn't a swap partition/LV.

[Heeter]

No. If you didn't run

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.

[TheFu]

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?

  ├─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}

$ 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.

[Heeter]

Hi TheFU

Nope, it doesn't show up:

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#

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#

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