LVM の作成、削除

https://access.redhat.com/site/documentation/ja-JP/Red_Hat_Enterprise_Linux/6/html-single/Logical_Volume_Manager_Administration/index.html

http://www.atmarkit.co.jp/flinux/rensai/linuxtips/a070newlv.html

http://www.atmarkit.co.jp/flinux/rensai/linuxtips/a066resizelv.html

https://access.redhat.com/site/documentation/ja-JP/Red_Hat_Enterprise_Linux/6/html-single/Storage_Administration_Guide/index.html#ch-lvm

swapoff -v /dev/mapper/vg_lvs-lv_swap

lvreduce /dev/mapper/vg_lvs-lv_swap -L -512M

mkswap /dev/mapper/vg_lvs-lv_swap

swapon -v /dev/mapper/vg_lvs-lv_swap

---------------------

[root@LVS ~]# cat /proc/swaps

Filename                                Type            Size    Used    Priority

/dev/dm-1                               partition       1277944 0       -1

[root@LVS ~]# swapoff -v /dev/mapper/vg_lvs-lv_swap

/dev/mapper/vg_lvs-lv_swap に swapoff

[root@LVS ~]# lvreduce /dev/mapper/vg_lvs-lv_swap -L -512M

  WARNING: Reducing active logical volume to 736.00 MiB

  THIS MAY DESTROY YOUR DATA (filesystem etc.)

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

  Reducing logical volume lv_swap to 736.00 MiB

  Logical volume lv_swap successfully resized

[root@LVS ~]# mkswap /dev/mapper/vg_lvs-lv_swap

mkswap: /dev/mapper/vg_lvs-lv_swap: warning: don't erase bootbits sectors

        on whole disk. Use -f to force.

スワップ空間バージョン1を設定します、サイズ = 753660 KiB

ラベルはありません, UUID=e7addac9-b515-409a-9ab7-dd3c63f4321e

[root@LVS ~]# swapon -v /dev/mapper/vg_lvs-lv_swap

/dev/mapper/vg_lvs-lv_swap に swapon

swapon: /dev/mapper/vg_lvs-lv_swap: found swap signature: version 1, page-size 4, 同じ byte order

swapon: /dev/mapper/vg_lvs-lv_swap: pagesize=4096, swapsize=771751936, devsize=771751936

[root@LVS ~]#

[root@LVS ~]# cat /proc/swaps

Filename                                Type            Size    Used    Priority

/dev/dm-1                               partition       753656  0       -1

[root@LVS ~]#

---------------------

swapoff -v /dev/mapper/vg_lvs-lv_swap

lvchange -an /dev/mapper/vg_lvs-lv_swap

lvreduce /dev/mapper/vg_lvs-lv_swap -L -100M

lvchange -ay /dev/mapper/vg_lvs-lv_swap

mkswap /dev/mapper/vg_lvs-lv_swap

swapon -v /dev/mapper/vg_lvs-lv_swap

---------------------

[root@LVS ~]# cat /proc/swaps

Filename                                Type            Size    Used    Priority

/dev/dm-1                               partition       753656  0       -1

[root@LVS ~]# swapoff -v /dev/mapper/vg_lvs-lv_swap

/dev/mapper/vg_lvs-lv_swap に swapoff

[root@LVS ~]# lvchange -an /dev/mapper/vg_lvs-lv_swap

[root@LVS ~]# lvreduce /dev/mapper/vg_lvs-lv_swap -L -100M

  Reducing logical volume lv_swap to 636.00 MiB

  Logical volume lv_swap successfully resized

[root@LVS ~]# lvchange -ay /dev/mapper/vg_lvs-lv_swap

[root@LVS ~]# mkswap /dev/mapper/vg_lvs-lv_swap

mkswap: /dev/mapper/vg_lvs-lv_swap: warning: don't erase bootbits sectors

        on whole disk. Use -f to force.

スワップ空間バージョン1を設定します、サイズ = 651260 KiB

ラベルはありません, UUID=0ce21176-82ae-4ef9-b050-2c16fc8e1bd7

[root@LVS ~]# swapon -v /dev/mapper/vg_lvs-lv_swap

/dev/mapper/vg_lvs-lv_swap に swapon

swapon: /dev/mapper/vg_lvs-lv_swap: found swap signature: version 1, page-size 4, 同じ byte order

swapon: /dev/mapper/vg_lvs-lv_swap: pagesize=4096, swapsize=666894336, devsize=666894336

[root@LVS ~]#

[root@LVS ~]# cat /proc/swaps

Filename                                Type            Size    Used    Priority

/dev/dm-1                               partition       651256  0       -1

[root@LVS ~]#

---------------------

---------------------

[root@LVS ~]# lvdisplay

  --- Logical volume ---

  LV Path                /dev/VolGroup00/LogVol01

  LV Name                LogVol01

  VG Name                VolGroup00

  LV UUID                fErMm5-N9zC-0Sjw-4tze-5AJL-XJdt-q932pL

  LV Write Access        read/write

  LV Creation host, time LVS, 2014-03-06 01:48:31 +0900

  LV Status              available

  # open                 0

  LV Size                7.00 GiB

  Current LE             224

  Segments               1

  Allocation             inherit

  Read ahead sectors     auto

  - currently set to     256

  Block device           253:2

mkswap /dev/VolGroup00/LogVol01

echo "/dev/VolGroup00/LogVol01 swap swap defaults 0 0" >> /etc/fstab

swapon -v /dev/VolGroup00/LogVol01

---------------------

swapoff -v /dev/VolGroup00/LogVol01

lvreduce /dev/VolGroup00/LogVol01 -L -512M

mkswap /dev/VolGroup00/LogVol01

swapon -v /dev/VolGroup00/LogVol01

[root@LVS ~]# cat /proc/swaps

Filename                                Type            Size    Used    Priority

/dev/dm-1                               partition       7340024 0       -1

[root@LVS ~]# swapoff -v /dev/VolGroup00/LogVol01

/dev/VolGroup00/LogVol01 に swapoff

[root@LVS ~]# lvreduce /dev/VolGroup00/LogVol01 -L -512M

  WARNING: Reducing active logical volume to 6.50 GiB

  THIS MAY DESTROY YOUR DATA (filesystem etc.)

Do you really want to reduce LogVol01? [y/n]: n

  Logical volume LogVol01 NOT reduced

[root@LVS ~]# lvchange -an /dev/VolGroup00/LogVol01

[root@LVS ~]# lvreduce /dev/VolGroup00/LogVol01 -L -512M

  Reducing logical volume LogVol01 to 6.50 GiB

  Logical volume LogVol01 successfully resized

[root@LVS ~]#

[root@LVS ~]# lvchange -ay /dev/VolGroup00/LogVol01

[root@LVS ~]#

[root@LVS ~]# mkswap /dev/VolGroup00/LogVol01

mkswap: /dev/VolGroup00/LogVol01: warning: don't erase bootbits sectors

        on whole disk. Use -f to force.

スワップ空間バージョン1を設定します、サイズ = 6815740 KiB

ラベルはありません, UUID=4bcca981-3142-4a88-a421-875278828caa

[root@LVS ~]#

[root@LVS ~]# swapon -v /dev/VolGroup00/LogVol01

/dev/VolGroup00/LogVol01 に swapon

swapon: /dev/mapper/VolGroup00-LogVol01: found swap signature: version 1, page-size 4, 同じ byte order

swapon: /dev/mapper/VolGroup00-LogVol01: pagesize=4096, swapsize=6979321856, devsize=6979321856

[root@LVS ~]#

[root@LVS ~]# cat /proc/swaps

Filename                                Type            Size    Used    Priority

/dev/dm-1                               partition       6815736 0       -1

[root@LVS ~]#