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My PC has two SSDs (120GB and 465GB), the smaller SSD is mounted on / and currently the larger SSD is mounted on /tmp. Output of df -h:

    Filesystem      Size  Used Avail Use% Mounted on
udev             12G     0   12G   0% /dev
tmpfs           2.4G  114M  2.3G   5% /run
/dev/sda1       101G   88G  8.1G  92% /
tmpfs            12G  130M   12G   2% /dev/shm
tmpfs           5.0M  4.0K  5.0M   1% /run/lock
tmpfs            12G     0   12G   0% /sys/fs/cgroup
/dev/sdb5       459G   73M  435G   1% /tmp
tmpfs           2.4G  112K  2.4G   1% /run/user/1001

I have quite limited experience in doing this so I'm just looking for the easiest way of re-allocating space from the larger SSD to / or to /home from /tmp.

(Note: I didn't create this set-up myself, there was a previous user who mounted the drives in this way.)

fdisk -l output:

Disk /dev/sda: 119.2 GiB, 128035676160 bytes, 250069680 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos

Device     Boot     Start       End   Sectors   Size Id Type
/dev/sda1  *         2048 214843391 214841344 102.5G 83 Linux
/dev/sda2       214845438 250068991  35223554  16.8G  5 Extended
/dev/sda5       214845440 250068991  35223552  16.8G 82 Linux swap / Solaris


Disk /dev/sdb: 465.8 GiB, 500107862016 bytes, 976773168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos

Device     Boot Start       End   Sectors   Size Id Type
/dev/sdb1        2046 976771071 976769026 465.8G  5 Extended
/dev/sdb5        2048 976771071 976769024 465.8G 83 Linux
Danny Friar
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  • this is easily done if your setup had used different format options (eg. lvm). in your case I'd just boot a live usb-thumb drive (eg. ubuntu install media) and copy directories such as /home to the second drive (after cp has completed; I'd diff to ensure they copied correctly; then rm only if you're happy; yes you could mv but the added diff compare step makes me happier). then modify your /etc/fstab to reflect your new chosen layout & reboot your normal ubuntu os. – guiverc Nov 16 '17 at 11:35

1 Answers1

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First unmount the sdb5 

sudo umount /tmp

then mount it to your home directory using:

sudo mount /dev/sdb5 /home

refer to mapages of mount for more details.

Abel Tom
  • 641
  • before I did that; I'd copy the data you want from your existing home, to a directory on the larger SSD, and then mount that directory as your new $HOME. the reason for this is the newer mount will overshadow your existing $HOME & any files there will become hidden (ie. you can't access them when the larger SSD is mounted as $HOME). – guiverc Nov 16 '17 at 11:33
  • It doesn't allow me to umount /tmp as the device is busy. I tried killing the processes on /tmp as suggested here https://askubuntu.com/questions/199565/not-enough-space-on-tmp, but killing the processes logs me out. – Danny Friar Nov 16 '17 at 11:39