Moving disk space between mount points

genevish · 09-09-2015, 02:16 PM

I had:

/home = 1Tb
/ = 50G

I ran:

Code:

umount /home
lvreduce -L -900G /dev/centos/home
lvextend -L +900G /dev/centos/root
xfs_growfs /

And now home is unmountable. i suspect because I wiped the superblock? Can I reformat it somehow to fix this? There's nothing on the server yet so I can reinstall if needed, but I'd rather not...

hortageno · 09-09-2015, 03:02 PM

Quote:

Originally Posted by genevish

I had:

/home = 1Tb
/ = 50G

I ran:

Code:

umount /home
lvreduce -L -900G /dev/centos/home
lvextend -L +900G /dev/centos/root
xfs_growfs /

And now home is unmountable. i suspect because I wiped the superblock? Can I reformat it somehow to fix this? There's nothing on the server yet so I can reinstall if needed, but I'd rather not...

Ouch! You needed to resize the filesystem first, which is not possible with xfs. You should have formatted your partitions with ext4 to be able to do that.

jefro · 09-09-2015, 07:13 PM

I have a dumb question. Wonder what would happen if you try to correct it back?

hortageno · 09-10-2015, 06:34 AM

Quote:

Originally Posted by jefro

I have a dumb question. Wonder what would happen if you try to correct it back?

I doubt it is possible, but others may know better. You wrote earlier that there is nothing on the server yet. So just re-format /home and recreate the user directories. Was xfs the default in your distribution or did you choose it on purpose?

genevish · 09-10-2015, 12:26 PM

XFS was the default. How do I reformat home at this point?

Thanks,

-Scott

hortageno · 09-10-2015, 02:45 PM

Quote:

Originally Posted by genevish

XFS was the default. How do I reformat home at this point?

Instead of waiting a few hours for an answer you could have googled it in seconds.

http://lmgtfy.com/?q=format+partition+xfs

The partition needs to be unmounted for this. If you wanna format it with a different filesystem, you would need to change the mount options in /etc/fstab.

genevish · 09-11-2015, 12:09 PM

Quote:

Originally Posted by hortageno

Instead of waiting a few hours for an answer you could have googled it in seconds.

http://lmgtfy.com/?q=format+partition+xfs

The partition needs to be unmounted for this. If you wanna format it with a different filesystem, you would need to change the mount options in /etc/fstab.

Ahh, I love using LMGTFY on dumbasses myself. However, I did google it and got results similar to these. They all detail scenarios where you are formatting an entire device (/dev/sda for example), but i just need to get just the /home mount point on /dev/sda reformatted or recreated. I ended up deleting the entire VM and recreating it from scratch with the correct partitions. Linux had some work to do on user friendliness, and disk formatting is it's biggest weakness, IMHO.

hortageno · 09-11-2015, 12:36 PM

Quote:

Originally Posted by genevish

Ahh, I love using LMGTFY on dumbasses myself. However, I did google it and got results similar to these. They all detail scenarios where you are formatting an entire device (/dev/sda for example), but i just need to get just the /home mount point on /dev/sda reformatted or recreated. I ended up deleting the entire VM and recreating it from scratch with the correct partitions. Linux had some work to do on user friendliness, and disk formatting is it's biggest weakness, IMHO.

None my search results said to format an entire device, they all talk about partitions and volumes. So in your case it would have been

Code:

sudo mkfs.xfs /dev/centos/home