|
# Tested on RHEL 5, 6 & 7
# Check which is the swap volume and its size root@<server>:/#> cat /etc/fstab | grep swap /dev/rvg/swaplv swap swap defaults 0 0 root@<server>:/#> lvdisplay /dev/rvg/swaplv --- Logical volume --- LV Name /dev/rvg/swaplv VG Name rvg LV UUID m0EThc-4Epd-Ecj3-lvPK-BfU0-D98H-1pgyRY LV Write Access read/write LV Status available # open 1 LV Size 13.69 GB Current LE 438 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:5 root@<server>:/#> free -m total used free shared buffers cached Mem: 11239 4556 6682 0 422 3697 -/+ buffers/cache: 436 10802 Swap: 14015 0 14015 <---- root@<server>:/#> cat /proc/swaps Filename Type Size Used Priority /dev/mapper/rvg-swaplv partition 14352376 0 -3 # Disable swapping on LV to be resized (in our case, as we have a single LV allocated to swap, we could # run command with '-a' flag so swapping is disabled on all known swap devices and files - as found in # /proc/swaps or /etc/fstab) # root@<server>:/#> swapoff -a root@<server>:/#> swapoff /dev/rvg/swaplv # Check that swapping has been disabled root@<server>:/#> free total used free shared buffers cached Mem: 11508864 4657932 6850932 0 432268 3786136 -/+ buffers/cache: 439528 11069336 Swap: 0 0 0 <---- # Extend swap Logical Volume (we will add 1 GB) # Verify that there is enough space on VG root@<server>:/#> vgdisplay /dev/rvg --- Volume group --- VG Name rvg System ID Format lvm2 Metadata Areas 1 Metadata Sequence No 21 VG Access read/write VG Status resizable MAX LV 0 Cur LV 6 Open LV 6 Max PV 0 Cur PV 1 Act PV 1 VG Size 136.50 GB PE Size 32.00 MB Total PE 4368 Alloc PE / Size 1718 / 53.69 GB Free PE / Size 2650 / 82.81 GB <---- VG UUID 2TkcmU-Uzys-Znql-aXqx-pr2D-O8dk-oWsOlL # Extend LV root@<server>:/#> lvextend -L +1GB /dev/rvg/swaplv Extending logical volume swaplv to 14.69 GB Logical volume swaplv successfully resized # Set up the new swap area root@<server>:/#> mkswap /dev/rvg/swaplv Setting up swapspace version 1, size = 15770578 kB # Enable swapping on resized LV (in our case, as we have a single LV allocated to swap, we could # run command with '-a' flag so swapping is enabled on all known swap devices and files (as found # in /proc/swaps or /etc/fstab) # root@<server>:/#> swapon -a root@<server>:/#> swapon /dev/rvg/swaplv # Check final size root@<server>:/#> free total used free shared buffers cached Mem: 11508864 4664192 6844672 0 432284 3786136 -/+ buffers/cache: 445772 11063092 Swap: 15400952 0 15400952 <---- |