How to resize swap disk redhat 7.3 lvm
Before we resize the swap partition, resize the swap lvm first, make sure you have enough volume group
[root@myhost ~]# pvscan
PV /dev/sda3 VG rhel lvm2 [18.99 GiB / 0 free]
Total: 1 [18.99 GiB] / in use: 1 [18.99 GiB] / in no VG: 0 [0 ]
[root@myhost ~]#
[root@myhost ~]# pvresize /dev/sda3
Physical volume "/dev/sda3" changed
1 physical volume(s) resized / 0 physical volume(s) not resized
[root@myhost ~]#
[root@myhost ~]# pvs
PV VG Fmt Attr PSize PFree
/dev/sda3 rhel lvm2 a-- 48.99g 30.00g
[root@myhost ~]#
[root@myhost ~]# lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
root rhel -wi-ao---- 16.99g
swap rhel -wi-ao---- 2.00g
[root@myhost ~]#
Extend the lvm
[root@myhost ~]# lvextend -L +27G /dev/rhel/root
Size of logical volume rhel/root changed from 16.99 GiB (4350 extents) to 43.99 GiB (11262 extents).
Logical volume rhel/root successfully resized.
[root@myhost ~]#
[root@myhost ~]# lvextend -L +2G /dev/rhel/swap
Size of logical volume rhel/swap changed from 2.00 GiB (512 extents) to 4.00 GiB (1024 extents).
Logical volume rhel/swap successfully resized.
[root@myhost ~]#
[root@myhost ~]# lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
root rhel -wi-ao---- 43.99g
swap rhel -wi-ao---- 4.00g
[root@myhost ~]#
Check the block disk
[root@myhost ~]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 50G 0 disk
├─sda1 8:1 0 4M 0 part
├─sda2 8:2 0 1G 0 part /boot
└─sda3 8:3 0 49G 0 part
├─rhel-root 253:0 0 44G 0 lvm /
└─rhel-swap 253:1 0 4G 0 lvm [SWAP]
sr0 11:0 1 3G 0 rom
[root@myhost ~]#
Check the swap size
[root@myhost ~]# swapon -s
Filename Type Size Used Priority
/dev/dm-1 partition 2097088 0 -1
[root@myhost ~]#
Turn off the swap
[root@myhost ~]# swapoff -v /dev/rhel/swap
swapoff /dev/rhel/swap
[root@myhost ~]#
Make swap
[root@myhost ~]# mkswap /dev/rhel/swap
mkswap: /dev/rhel/swap: warning: wiping old swap signature.
Setting up swapspace version 1, size = 4194240 KiB
no label, UUID=07620b10-fc56-429f-a433-4caa67594d47
[root@myhost ~]#
Check the swap
[root@myhost ~]# swapon -va
swapon /dev/mapper/rhel-swap
swapon: /dev/mapper/rhel-swap: found swap signature: version 1, page-size 64, same byte order
swapon: /dev/mapper/rhel-swap: pagesize=65536, swapsize=4294967296, devsize=4294967296
[root@myhost ~]#
Check the swap size
[root@myhost ~]# swapon -s
Filename Type Size Used Priority
/dev/dm-1 partition 4194240 0 -1
[root@myhost ~]#
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