lvm関連の記録

サーバの計画停止前後の作業に関するご参考メモにて、下記のように書いた。

• mountしているファイルシステムを記録する。
  mount > 正常時マウントファイルシステム一覧.txt


• 各ファイルシステムの空き容量なども、同時に記録しておく。
  df > 正常時ファイル使用量一覧.txt

しかし、今時のlvmを使っているシステムでは、上記だけでは分からないこともある。

実際に、このBlogを動かしているLinux機もlvmを使っていて、dfとmountだと物理的なドライブと論理的なパーティションの関係が見えない。

root@hong:/# df
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/mapper/hong-root
115460648 11691632 97903956 11% /
none 498572 240 498332 1% /dev
none 504548 0 504548 0% /dev/shm
none 504548 92 504456 1% /var/run
none 504548 0 504548 0% /var/lock
/dev/sda1 233191 74886 145864 34% /boot
/dev/mapper/home-shibata
103212320 42069396 55900044 43% /home
/dev/mapper/home-backup
77409288 68440672 5036456 94% /home/backup
root@hong:/# mount
/dev/mapper/hong-root on / type ext4 (rw,errors=remount-ro)
proc on /proc type proc (rw,noexec,nosuid,nodev)
none on /sys type sysfs (rw,noexec,nosuid,nodev)
fusectl on /sys/fs/fuse/connections type fusectl (rw)
none on /sys/kernel/debug type debugfs (rw)
none on /sys/kernel/security type securityfs (rw)
none on /dev type devtmpfs (rw,mode=0755)
none on /dev/pts type devpts (rw,noexec,nosuid,gid=5,mode=0620)
none on /dev/shm type tmpfs (rw,nosuid,nodev)
none on /var/run type tmpfs (rw,nosuid,mode=0755)
none on /var/lock type tmpfs (rw,noexec,nosuid,nodev)
/dev/sda1 on /boot type ext2 (rw)
/dev/mapper/home-shibata on /home type ext3 (rw)
/dev/mapper/home-backup on /home/backup type ext3 (rw)
rpc_pipefs on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw)
nfsd on /proc/fs/nfsd type nfsd (rw)

これでは、ディスククラッシュ時にどのHDDをどうすれば良いのか分からない。

自分の記録を兼ねて、lvmの状態記録するコマンドとその結果を書いておく。

root@hong:/# lvm pvs
PV VG Fmt Attr PSize PFree
/dev/sda5 hong lvm2 a- 114.80g 0
/dev/sdb1 home lvm2 a- 186.30g 11.30g
root@hong:/# lvm vgs
VG #PV #LV #SN Attr VSize VFree
home 1 2 0 wz--n- 186.30g 11.30g
hong 1 2 0 wz--n- 114.80g 0
root@hong:/# lvm lvs
LV VG Attr LSize Origin Snap% Move Log Copy% Convert
backup home -wi-ao 75.00g
shibata home -wi-ao 100.00g
root hong -wi-ao 111.87g
swap_1 hong -wi-ao 2.93g
root@hong:/# lvm pvdisplay
--- Physical volume ---
PV Name /dev/sdb1
VG Name home
PV Size 186.31 GiB / not usable 3.69 MiB
Allocatable yes
PE Size 4.00 MiB
Total PE 47694
Free PE 2894
Allocated PE 44800
PV UUID 7lVW1I-bkBd-JqAY-ZmKr-NO87-uuRD-0AVyao
--- Physical volume ---
PV Name /dev/sda5
VG Name hong
PV Size 114.80 GiB / not usable 3.00 MiB
Allocatable yes (but full)
PE Size 4.00 MiB
Total PE 29388
Free PE 0
Allocated PE 29388
PV UUID ZH3dd0-8P2q-1zTz-2DYj-zDgf-hd14-vFVGgX
root@hong:/# lvm lvdisplay
--- Logical volume ---
LV Name /dev/home/backup
VG Name home
LV UUID IGmFsr-KCJJ-dYB8-Vn7O-fFMB-cbmv-NxyNjq
LV Write Access read/write
LV Status available
# open 1
LV Size 75.00 GiB
Current LE 19200
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 251:0
--- Logical volume ---
LV Name /dev/home/shibata
VG Name home
LV UUID tLrUnV-VRQo-uSUj-dB6N-mTKK-Qh9u-kt0OkV
LV Write Access read/write
LV Status available
# open 1
LV Size 100.00 GiB
Current LE 25600
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 251:1
--- Logical volume ---
LV Name /dev/hong/root
VG Name hong
LV UUID Eo3Xgd-8z3D-MlKt-ZpCF-SGxu-OaWM-IuP8kF
LV Write Access read/write
LV Status available
# open 1
LV Size 111.87 GiB
Current LE 28638
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 251:2
--- Logical volume ---
LV Name /dev/hong/swap_1
VG Name hong
LV UUID gFiccD-EZH3-QAZy-SWG1-wd2a-HPoM-E9gtq7
LV Write Access read/write
LV Status available
# open 1
LV Size 2.93 GiB
Current LE 750
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 251:3
root@hong:/# lvm vgdisplay
--- Volume group ---
VG Name home
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 3
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 2
Open LV 2
Max PV 0
Cur PV 1
Act PV 1
VG Size 186.30 GiB
PE Size 4.00 MiB
Total PE 47694
Alloc PE / Size 44800 / 175.00 GiB
Free PE / Size 2894 / 11.30 GiB
VG UUID doTZj5-bjAc-Tu1q-FElV-GkSQ-Y17F-2wO4F8
--- Volume group ---
VG Name hong
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 3
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 2
Open LV 2
Max PV 0
Cur PV 1
Act PV 1
VG Size 114.80 GiB
PE Size 4.00 MiB
Total PE 29388
Alloc PE / Size 29388 / 114.80 GiB
Free PE / Size 0 / 0
VG UUID yOL3WY-JR09-qc9P-1EiV-d8d0-pWqT-Be0ipp