linux swap分区调控（swap分区lvm管理）

发布时间：2014-09-05 13:50:26作者：知识屋

注：linux swap分区采用lvm管理，调控可以采用下面的方法

一.查看 swap lv

[root@testdb ~]# vgdisplay -v

Finding all volume groups

Finding volume group "VolGroup"

--- Volume group ---

VG Name VolGroup

System ID

Format lvm2

Metadata Areas 1

Metadata Sequence No 4

VG Access read/write

VG Status resizable

MAX LV 0

Cur LV 3

Open LV 3

Max PV 0

Cur PV 1

Act PV 1

VG Size 357.38 GiB

PE Size 4.00 MiB

Total PE 91489

Alloc PE / Size 34512 / 134.81 GiB

Free PE / Size 56977 / 222.57 GiB

VG UUID q6q2yf-Isfw-DnkL-JeSN-uTvC-l5m2-M0HEco

--- Logical volume ---

LV Path /dev/VolGroup/lv_root

LV Name lv_root

VG Name VolGroup

LV UUID 0nFC6x-BsP2-7w0r-8bPV-Vw9j-whIz-EWj5Ba

LV Write Access read/write

LV Creation host, time localhost.localdomain, 2013-09-16 08:41:58 +0800

LV Status available

# open 1

LV Size 29.30 GiB

Current LE 7500

Segments 1

Allocation inherit

Read ahead sectors auto

- currently set to 256

Block device 252:0

--- Logical volume ---

LV Path /dev/VolGroup/lv_swap

LV Name lv_swap

VG Name VolGroup

LV UUID OJaxbf-MPay-cjep-L44c-UKDx-ZmGW-v24yUf

LV Write Access read/write

LV Creation host, time localhost.localdomain, 2013-09-16 08:42:00 +0800

LV Status available

# open 2

LV Size 7.86 GiB

Current LE 2012

Segments 1

Allocation inherit

Read ahead sectors auto

- currently set to 256

Block device 252:1

--- Logical volume ---

LV Path /dev/VolGroup/lv_home

LV Name lv_home

VG Name VolGroup

LV UUID HZvOuv-G8NW-2ZyW-3Ffl-H54i-Kmjp-8ndVqo

LV Write Access read/write

LV Creation host, time localhost.localdomain, 2013-09-16 08:42:01 +0800

LV Status available

# open 1

LV Size 97.66 GiB

Current LE 25000

Segments 1

Allocation inherit

Read ahead sectors auto

- currently set to 256

Block device 252:2

--- Physical volumes ---

PV Name /dev/sda2

PV UUID gQvj3L-kOPV-LILA-KPnD-a8W9-lgdE-09vtlQ

PV Status allocatable

Total PE / Free PE 91489 / 56977

swap 分区 lv 为/dev/VolGroup/lv_swap

二.扩大swap分区

关闭交换分区

[root@testdb ~]# swapoff /dev/VolGroup/lv_swap

[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

扩展 /dev/VolGroup/lv_swap，增加8336M

[root@testdb ~]# lvextend -L +8336M /dev/VolGroup/lv_swap

Extending logical volume lv_swap to 16.28 GiB

Logical volume lv_swap successfully resized

将 /dev/VolGroup/lv_swap 设置为swap分区

[root@testdb ~]# mkswap /dev/VolGroup/lv_swap

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

[root@testdb ~]# free -m

total used free shared buffers cached

Mem: 16081 14683 1398 0 83 13680

-/+ buffers/cache: 918 15162

Swap: 0 0 0

启动swap分区

[root@testdb ~]# swapon /dev/VolGroup/lv_swap

[root@testdb ~]# free -m

total used free shared buffers cached

Mem: 16081 14695 1386 0 83 13680

-/+ buffers/cache: 931 15150

Swap: 16671 0 16671

三.减小swap分区

关闭交换分区

[root@testdb ~]# swapoff /dev/VolGroup/lv_swap

[root@testdb ~]# free -m

total used free shared buffers cached

Mem: 16081 15141 940 0 255 13953

-/+ buffers/cache: 932 15149

Swap: 0 0 0

减小 /dev/VolGroup/lv_swap 8000M

[root@testdb ~]# lvreduce -L -8000M /dev/VolGroup/lv_swap

WARNING: Reducing active logical volume to 8.47 GiB

THIS MAY DESTROY YOUR DATA (filesystem etc.)

Do you really want to reduce lv_swap? [y/n]: y

Reducing logical volume lv_swap to 8.47 GiB

Logical volume lv_swap successfully resized

[root@testdb ~]# free -m

total used free shared buffers cached

Mem: 16081 15143 938 0 256 13955

-/+ buffers/cache: 931 15149

Swap: 0 0 0

将 /dev/VolGroup/lv_swap 设置为swap分区

[root@testdb ~]# mkswap /dev/VolGroup/lv_swap

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

on whole disk. Use -f to force.

Setting up swapspace version 1, size = 8880124 KiB

no label, UUID=1951f318-e2eb-45d5-b1ed-25a2bf87adea

[root@testdb ~]# free -m

total used free shared buffers cached

Mem: 16081 15142 938 0 256 13955

-/+ buffers/cache: 931 15150

Swap: 0 0 0

开启swap分区

[root@testdb ~]# swapon /dev/VolGroup/lv_swap

[root@testdb ~]# free -m

total used free shared buffers cached

Mem: 16081 15149 932 0 256 13955

-/+ buffers/cache: 937 15143

Swap: 8671 0 8671

[root@testdb ~]#

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linux swap分区调控（swap分区lvm管理）

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