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I need the space of sda on either / or a specific mount like /data. How can I repartition / change the current layout to match the needed desire?

sda 8:0 0 2.7T 0 disk ├─sda1 8:1 0 1M 0 part ├─sda2 8:2 0 1G 0 part /boot └─sda3 8:3 0 2.7T 0 part ├─centos_hosted--by-root 253:0 0 50G 0 lvm / ├─centos_hosted--by-swap 253:1 0 15.8G 0 lvm [SWAP] └─centos_hosted--by-home 253:2 0 2.7T 0 lvm /home

fstab

/dev/mapper/centos_hosted--by-root /                       xfs     defaults        0 0
UUID=428e7c4c-d50a-45cc-ac2e-ab7f21e39a69 /boot            xfs     defaults        0 0
/dev/mapper/centos_hosted--by-home /home                   xfs     defaults        0 0
/dev/mapper/centos_hosted--by-swap swap                    swap    defaults        0 0

The partition should be ext4. /home is empty so it wouldn't care if it has to be wiped.
Is it possible to archieve it without reinstalling the whole server?

  • Why does it have to be a new partition and specifically ext4-formatted? Can't you just shrink an existing filesystem, lvreduce the LV it's on, then lvextend -r the existing / LV? – n.st Nov 29 '18 at 15:31
  • Oh, scratch the "shrink" part: XFS cannot be shrunk. Still, delete /home and extend / without creating a new partition? – n.st Nov 29 '18 at 15:33
  • @n.st, my understanding is OP want ext4 filesystem. And root is xfs – Romeo Ninov Nov 29 '18 at 21:00
  • @RomeoNinov I understand they want ext4, but I'd like to know why. Not to be rude, but from the question I get the impression that OP doesn't know much about the differences between filesystems, so they might be asking for ext4 without a technical reason. – n.st Nov 29 '18 at 23:13
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THe process is sample (if /home is fine to be destroyed) Exec following commands (as root)

umount /home
lvremove /dev/mapper/centos_hosted--by-home
#if the name of volume group is centos_hosted--by
lvcreate -n centos_hosted--by-data -L 100G centos_hosted--by 
mkfs.ext4 /dev/mapper/centos_hosted--by-data
mkdir -p /data
mount /dev/mapper/centos_hosted--by-data /data

Edit /etc/fstab and replace /home with /data and centos_hosted--by-home with centos_hosted--by-data. Also change xfs in this line with ext4

If you want to see the name of volume group exec command vgs

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