If you plan a new UCS domain, you can adapt the partitioning to a more serverly way. This would be suitable basically for UCS Masters, BackUps and Slaves. Partitionsizes in this example may change to your needs.
Preparation:
- choose install LVM with separate /home, /var/ and /tmp partition
- finish the installation of UCS (with or without joining the system into the domain, if its not an UCS Master)
- shutdown the system
- mount a Live-Linux-CD (i.e. Debian, GParted Live, Ubuntu or whatever you like) and boot it
- enter the command prompt in the Live-Linux of your choice
In between the following steps, check with lsblk, pvdisplay and/ or df -h frequently, if the results fit your needs.
# create mount directories and mount root, var and lognew
cd /mnt
mkdir root var logneu
mount -o rw /dev/vg_ucs/root /mnt/root
mount -o rw /dev/vg_ucs/var /mnt/var
mount -o rw /dev/vg_ucs/varlog /mnt/lognew
# for the following work with the lvms:
# -t is for dry-run, remove to run the command on the selected partition;
# -v for verbose output; remove if you are a more quiet person ;)
# remove /home and /tmp paritions
lvremove -tv /dev/vg_ucs/home
lvremove -tv /dev/vg_ucs/tmp
# extend /var-partition to 70 GB
lvextend -tv -L70GB -r /dev/vg_ucs/var
# create /varlog-partition and use all free space, that is left (see "Free PE" when checking `pvdisplay` and create ext4-filesystem
lvcreate -tv -l+100%FREE -r varlog vg_ucs
mkfs.ext4 /dev/mapper/vg_ucs-varlog
# copy old /var/log/-content to /mnt/lognew
rsync -oav /mnt/var/log/ /mnt/lognew/
# remove old /var/log/-content, but not the directory itself!
rm -r /mnt/var/log/*
# adjust /etc/fstab of the "real" UCS-system
# remove the lines /home with /tmp
# duplicate line of /var and change the partitionname to -> varlog and the mount-point /var/log
vi /mnt/root/etc/fstab
systemctl poweroff
If everything worked fine, it should look i.e. like this:
df -h
Dateisystem Größe Benutzt Verf. Verw% Eingehängt auf
[...]
/dev/mapper/vg_ucs-root 22G 3,9G 17G 19% /
/dev/mapper/vg_ucs-var 70G 31G 34G 42% /var
/dev/mapper/vg_ucs-varlog 52G 3,6G 46G 8% /var/log
see also: How-To: Extend Disk Space