ubuntu lv swap扩展

swap在lv  /dev/ubuntu-vg/swap_1上

1.关闭交换分区swapoff,要保证剩余内存>=swap的used,自我感觉swap会释放到内存中.否则会报错swapoff failed: Cannot allocate memory

[root@testdb ~]# swapoff /dev/ubuntu-vg/swap_1   

[root@testdb ~]# free -m

             total       used       free     shared    buffers     cached

Mem:         16081      14682       1398          0         83      13680

-/+ buffers/cache:        919      15162

Swap:            0          0          0

 

 

2.扩展 /dev/ubuntu-vg/swap_1，增加5G

 [root@testdb ~]# lvextend -L +5G /dev/ubuntu-vg/swap_1

  Logical volume swap_1successfully resized

 

 

3.将/dev/ubuntu-vg/swap_1 设置为swap分区

 [root@testdb ~]# mkswap /dev/ubuntu-vg/swap_1

mkswap: /dev/VolGroup/lv_swap: warning: don't erase bootbits sectors

        on whole disk. Use -f to force.

Setting up swapspace version 1, size = 17072124 KiB

no label, UUID=f5fa0e85-da9e-440c-8f1c-e3ab978c9d6b

 

4.启动swap分区

[root@testdb ~]# swapon /dev/ubuntu-vg/swap_1

[root@testdb ~]# free -m

total used free shared buffers cached
Mem: 5.8G 2.3G 3.5G 15M 40M 287M
-/+ buffers/cache: 2.0G 3.9G
Swap: 6.0G 0B 6.0G