Linux LVM在线扩容

环境：

虚拟化环境，SUSE Linux Enterprise Server 11sp3，直接把虚拟磁盘从100G改成150G。

现有的LVM是100G，/home 的LV需要再加50G。

步骤：

fdisk 先把多加的50G分成一个区，再把该区划成pv，把该pv加到vg里面，再扩LV，最后扩文件系统。

 Last login: Sat Mar 28 16:29:42 2015 from 10.31.29.10

xickDB:~ # df -h 

Filesystem               Size  Used Avail Use% Mounted on

/dev/mapper/system-root  9.9G  5.2G  4.2G  56% /

udev                     1.9G  100K  1.9G   1% /dev

tmpfs                    9.0G   72K  9.0G   1% /dev/shm

/dev/sda1                152M   81M   63M  57% /boot

/dev/mapper/system-home   25G   13G   11G  55% /home

xickDB:~ # fdisk -l 

Disk /dev/sda: 161.1 GB, 161061273600 bytes

255 heads, 63 sectors/track, 19581 cylinders, total 314572800 sectors

... ...

Disk /dev/mapper/system-swap doesn't contain a valid partition table

xickDB:~ # vgdisplay 

  --- Volume group ---

  VG Name               system

  System ID             

  Format                lvm2

  ... ...

  VG Size               99.84 GiB

  PE Size               4.00 MiB

  Total PE              25560

  Alloc PE / Size       11008 / 43.00 GiB

  Free  PE / Size       14552 / 56.84 GiB

  VG UUID               jarXED-0N3v-sey6-P4Rl-tLhp-gJtL-HJ11DB

   

xickDB:~ # fdisk /dev/sda

Command (m for help): n

Command action

   e   extended

   p   primary partition (1-4)

p

Partition number (1-4, default 3): 

Using default value 3

First sector (209715200-314572799, default 209715200): 

Using default value 209715200

Last sector, +sectors or +size{K,M,G} (209715200-314572799, default 314572799): 

Using default value 314572799

Command (m for help): p

Disk /dev/sda: 161.1 GB, 161061273600 bytes

255 heads, 63 sectors/track, 19581 cylinders, total 314572800 sectors

Units = sectors of 1 * 512 = 512 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk identifier: 0x0009d2de

   Device Boot      Start         End      Blocks   Id  System

/dev/sda1   *        2048      321535      159744   83  Linux

/dev/sda2          321536   209715199   104696832   8e  Linux LVM

/dev/sda3       209715200   314572799    52428800   83  Linux

Command (m for help): w

The partition table has been altered!

xickDB:~ # reboot 

Broadcast message from root (pts/1) (Sat Mar 28 16:37:26 2015):

The system is going down for reboot NOW!

Last login: Sat Mar 28 16:29:59 2015 from 10.31.29.10

xickDB:~ # 

xickDB:~ # fdisk -l 

Disk /dev/sda: 161.1 GB, 161061273600 bytes

255 heads, 63 sectors/track, 19581 cylinders, total 314572800 sectors

Units = sectors of 1 * 512 = 512 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk identifier: 0x0009d2de

   Device Boot      Start         End      Blocks   Id  System

/dev/sda1   *        2048      321535      159744   83  Linux

/dev/sda2          321536   209715199   104696832   8e  Linux LVM

/dev/sda3       209715200   314572799    52428800   83  Linux

... ...

xickDB:~ # pvs

  PV         VG     Fmt  Attr PSize  PFree 

  /dev/sda2  system lvm2 a--  99.84g 56.84g

xickDB:~ # pvcreate /dev/sda3

  Physical volume "/dev/sda3" successfully created

xickDB:~ # pvs

  PV         VG     Fmt  Attr PSize  PFree 

  /dev/sda2  system lvm2 a--  99.84g 56.84g

  /dev/sda3         lvm2 a--  50.00g 50.00g

xickDB:~ # vgextend system /dev/sda3

  Volume group "system" successfully extended

xickDB:~ # vgdisplay 

  --- Volume group ---

  VG Name               system

  System ID             

  Format                lvm2

  Metadata Areas        2

  Metadata Sequence No  5

  VG Access             read/write

  VG Status             resizable

  MAX LV                0

  Cur LV                3

  Open LV               3

  Max PV                0

  Cur PV                2

  Act PV                2

  VG Size               149.84 GiB

  PE Size               4.00 MiB

  Total PE              38359

  Alloc PE / Size       11008 / 43.00 GiB

  Free  PE / Size       27351 / 106.84 GiB

  VG UUID               jarXED-0N3v-sey6-P4Rl-tLhp-gJtL-HJ11DB

   

xickDB:~ # lvs

  LV   VG     Attr      LSize  Pool Origin Data%  Move Log Copy%  Convert

  home system -wi-ao--- 25.00g                                           

  root system -wi-ao--- 10.00g                                           

  swap system -wi-ao---  8.00g                                           

xickDB:~ # lvextend --help 

  lvextend: Add space to a logical volume

lvextend

        [-A|--autobackup y|n]

        [--alloc AllocationPolicy]

        [-d|--debug]

        [-f|--force]

        [-h|--help]

        [-i|--stripes Stripes [-I|--stripesize StripeSize]]

        {-l|--extents [+]LogicalExtentsNumber[%{VG|LV|PVS|FREE|ORIGIN}] |

         -L|--size [+]LogicalVolumeSize[bBsSkKmMgGtTpPeE]}

        [-m|--mirrors Mirrors]

        [--nosync]

        [--use-policies]

        [-n|--nofsck]

        [--noudevsync]

        [-r|--resizefs]

        [-t|--test]

        [--type VolumeType]

        [-v|--verbose]

        [--version]

        LogicalVolume[Path] [ PhysicalVolumePath... ]

xickDB:~ # lvextend --size +50G /dev/mapper/system-home 

  Extending logical volume home to 75.00 GiB

  Logical volume home successfully resized

xickDB:~ # lvs

  LV   VG     Attr      LSize  Pool Origin Data%  Move Log Copy%  Convert

  home system -wi-ao--- 75.00g                                           

  root system -wi-ao--- 10.00g                                           

  swap system -wi-ao---  8.00g                                           

   

xickDB:~ # resize2fs /dev/mapper/system-home 

resize2fs 1.41.9 (22-Aug-2009)

Filesystem at /dev/mapper/system-home is mounted on /home; on-line resizing required

old desc_blocks = 2, new_desc_blocks = 5

Performing an on-line resize of /dev/mapper/system-home to 19660800 (4k) blocks.

The filesystem on /dev/mapper/system-home is now 19660800 blocks long.

xickDB:~ # df -h 

Filesystem               Size  Used Avail Use% Mounted on

/dev/mapper/system-root  9.9G  5.2G  4.2G  56% /

udev                     1.9G  104K  1.9G   1% /dev

tmpfs                    9.0G   72K  9.0G   1% /dev/shm

/dev/sda1                152M   81M   63M  57% /boot

/dev/mapper/system-home   74G   13G   58G  19% /home