you_hikoの技術メモ

# pvcreate /dev/sda1

  Writing physical volume data to disk "/dev/sda1"
  Physical volume "/dev/sda1" successfully created

# pvdisplay -C

  PV         VG       Fmt  Attr PSize   PFree  
  /dev/sda1           lvm2 a--  465.76g 465.76g
  /dev/sdb2  vg_st120 lvm2 a--  465.27g      0

# pvdisplay

  --- Physical volume ---
  PV Name               /dev/sdb2
  VG Name               vg_st120
  PV Size               465.27 GiB / not usable 3.00 MiB
  Allocatable           yes (but full)
  PE Size               4.00 MiB
  Total PE              119109
  Free PE               0
  Allocated PE          119109
  PV UUID               Wg2OTZ-yeUB-oXZN-KsG5-5CHv-Qs0t-HYJjFL
   
  "/dev/sda1" is a new physical volume of "465.76 GiB"
  --- NEW Physical volume ---
  PV Name               /dev/sda1
  VG Name               
  PV Size               465.76 GiB
  Allocatable           NO
  PE Size               0   
  Total PE              0
  Free PE               0
  Allocated PE          0
  PV UUID               EaxFk2-sb08-XeKa-XDBC-4Njf-JvFn-UFKrY4 

# vgcreate vg_export /dev/sda1

  Volume group "vg_export" successfully created

# vgdisplay -v vg_export

    Using volume group(s) on command line
    Finding volume group "vg_export"
  --- Volume group ---
  VG Name               vg_export
  System ID             
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  1
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                0
  Open LV               0
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               465.76 GiB
  PE Size               4.00 MiB
  Total PE              119234
  Alloc PE / Size       0 / 0   
  Free  PE / Size       119234 / 465.76 GiB
  VG UUID               a5TB1n-fmJd-1Fxr-dzE2-nKsd-T0wM-UuHOnC
   
  --- Physical volumes ---
  PV Name               /dev/sda1     
  PV UUID               EaxFk2-sb08-XeKa-XDBC-4Njf-JvFn-UFKrY4
  PV Status             allocatable
  Total PE / Free PE    119234 / 119234

ボリュームグループ作成後、実際にファイルシステムとしてマウントできる単位である論理ボリューム(LV:Logical Volume)を作成する。

ここでは12GBの「LogVol00」という論理ボリュームを作成する。

# lvcreate -L 12G -n LogVol00 vg_export

  Logical volume "LogVol00" created

# lvdisplay -C

  LV       VG        Attr     LSize   Pool Origin Data%  Move Log Copy%  Convert
  LogVol00 vg_export -wi-a---  12.00g                                           
  LogVol00 vg_st120  -wi-ao--   4.00g                                           
  LogVol01 vg_st120  -wi-ao-- 461.27g 

# lvscan

# e2fsck -f /dev/mapper/VolGroup00-LogVol00

e2fsck 1.39 (29-May-2006)
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information
/dev/mapper/VolGroup00-LogVol00: 11/4210688 files (9.1% non-contiguous), 177206/8407040 blocks

# lvextend -L 64G /dev/mapper/VolGroup00-LogVol00

  Extending logical volume LogVol00 to 64.00 GB
  Logical volume LogVol00 successfully resized

# resize2fs /dev/mapper/VolGroup00-LogVol00 64G

resize2fs 1.39 (29-May-2006)
Resizing the filesystem on /dev/mapper/VolGroup00-LogVol00 to 4194304 (4k) blocks.
The filesystem on /dev/mapper/VolGroup00-LogVol00 is now 4194304 blocks long.

# resize2fs /dev/mapper/VolGroup00-LogVol00 16G

resize2fs 1.39 (29-May-2006)
Resizing the filesystem on /dev/mapper/VolGroup00-LogVol00 to 4194304 (4k) blocks.
The filesystem on /dev/mapper/VolGroup00-LogVol00 is now 4194304 blocks long.

# lvreduce -L 16G /dev/mapper/VolGroup00-LogVol00

  WARNING: Reducing active logical volume to 16.00 GB
  THIS MAY DESTROY YOUR DATA (filesystem etc.)
Do you really want to reduce VolGroup00-LogVol00? [y/n]: y
  Reducing logical volumeVolGroup00-LogVol00 to 16.00 GB
  Logical volume VolGroup00-LogVol00 successfully resized

# lvdisplay /dev/mapper/VolGroup00-LogVol00

# lvcreate -L 32G -n LogVol01 VolGroup00

# lvchange -ay /VolGroup00/LogVol01

# lvchange -an /VolGroup00/LogVol01

# lvcreate -s -L 4G -n vm1-snamp /dev/VolGroup00/LogVol01

  Logical volume "vm1-snamp" created

# lvscan

  ACTIVE   Original '/dev/VolGroup00/LogVol01' [15.62 GiB] inherit
  ACTIVE   Snapshot '/dev/VolGroup00/vm1-snamp' [4.00 GiB] inherit