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I have been attempting to move my /var folder to a new partition. I am using Debian 10.7 and have an 8GB processor so am trying to save space. I have tried several things but part of the data always seems to disappear. Here is what I have tried:

  1. Create new partition /dev/sda7
  2. mount /dev/sda7 to /mnt/newvar in /etc/fstab
  3. boot into single user mode
  4. mount / -rw -o remount
  5. cp -arpPv /var/* /mnt/newvar (when I examine the /mnt/newvar folder, it is the same size as the /var folder so I assume the copy worked correctly, all folders appear to be there)
  6. mv /var /var.old
  7. mkdir /var
  8. edit /etc/fstab and mount /dev/sda7 on /var
  9. restart system

When the system comes up, several folders are not viewable in /var, but if I boot to a rescue USB I can see all the folders on /var from there. Can I delete the /mnt/newvar folder? and the /var.old folder? If I do that then I seem to permanently lose the unviewable folders/files. I wanted to move this folder to a new partition in order to make the rest of the system read-only and would like to conserve space. if I can't delete the old folders then using a different partition does not help much with that. Can anyone tell me why some folders are not viewable and how do I keep from losing my data permanently?

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    In single user mode the /mnt/newvar directory won't have been mounted, so all you've done is copy the files from one part of the root filesystem to another
    – roaima
    Jun 23, 2021 at 23:29
  • Any suggestions as to what I should do differently? This whole process confuses me because, as you have stated, all I did was copy from one part of the file system to another. I have followed several posts that state to do what I outlined, but maybe I am missing something. Can I do a move (mv) instead?
    – newBird
    Jun 24, 2021 at 12:17
  • I've done this several times to move /home into its own partition. I've always booted from USB, created new [temporary] mount points for both the old and new locations. Worth running 'df -h' to check what is mounted where. Jun 24, 2021 at 21:06

1 Answer 1

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The /var directory contains a couple of symbolic links:-

  1. /var/lock/ -> /run/lock/

  2. /var/run/ -> /run/

I don't think that cp command is copying the symbolic links.

Perhaps you need to recreate them?

I wouldn't delete the old /var data until you have several days of trouble-free running.

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  • cp -a absolutely copies symbolic links. Jun 24, 2021 at 8:47
  • I also thought that the -P is to copy symbolic links, but I could be misunderstanding the options for the cp command. Would a mv command work for this? And what would happen to the symbolic links using 'mv'?
    – newBird
    Jun 24, 2021 at 12:21
  • mv moves symbolic links just fine. No idea what is your issue - I'm too lazy to understand it. Jun 26, 2021 at 17:21

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