Remove Disk From LVM

• First, we unmount.

# sudo umount /dev/vg_blah/lv_blah

• set active:

vgchange -ay

• Check the file system.

# sudo e2fsck -f /dev/vg_blah/lv_blah

• shrink ext4:

resize2fs -p /dev/VolGrp000/root 10G

• Resize the file system and the logical volume. Doing this in one step can avoid mistakes which cause dataloss. (Note lvreduce parameter -L interprets G as 2^30 bytes and g as 10^9 bytes.)

# sudo lvreduce --resizefs -L 9G /dev/vg_blah/lv_blah

• pvmove /dev/hdb
• (optional) Remove a physical drive from the volume group if desired (if you now have an unused drive).

# sudo vgreduce vg_blah /dev/sdxy