LVMパーティションを縮小(やらないほうがいい)

参考

• linux - How can I shrink a Logical Volume, and re-allocate the freed space into a new partition on the same drive? - Super User

LVMパーティションを縮小したい

• proxmox3.4をインストールしたDISK(80GB)のLVMが以下図上のようになった。
• 図下のように設定できたのでメモ (少し未割り当てが残った・・・)

設定

pvscan

# pvscan
PV /dev/sdc3 VG pve lvm2 [74.40 GiB / 48.15 GiB free]
Total: 1 [74.40 GiB] / in use: 1 [74.40 GiB] / in no VG: 0 [0 ]

• 74.40 - 48.15 = 26.25

26.25GBを指定したら怒られた

# pvresize --setphysicalvolumesize 26.25G /dev/sdc3
/dev/sdc3: cannot resize to 6719 extents as 6720 are allocated.
0 physical volume(s) resized / 1 physical volume(s) not resized

27GBの指定で成功

# pvresize --setphysicalvolumesize 27G /dev/sdc3
Physical volume "/dev/sdc3" changed
1 physical volume(s) resized / 0 physical volume(s) not resized
# pvs
PV VG Fmt Attr PSize PFree
/dev/sdc3 pve lvm2 a-- 27.00g 764.00m

確認

# gdisk -l /dev/sdc
Number Start (sector) End (sector) Size Code Name
1 34 2047 1007.0 KiB EF02
2 2048 262143 127.0 MiB EF00
3 262144 156301454 74.4 GiB 8E00

gdiskでsdc3のサイズを変更

# gdisk /dev/sdc
Command (? for help): d
Partition number (1-3): 3
Command (? for help): n
Partition number (3-128, default 3):
First sector (262144-156301454, default = 262144) or {+-}size{KMGTP}:
Last sector (262144-156301454, default = 156301454) or {+-}size{KMGTP}: +27G
Current type is 'Linux filesystem'
Hex code or GUID (L to show codes, Enter = 8300): 8E00
Changed type of partition to 'Linux LVM'
Command (? for help): w
Final checks complete. About to write GPT data. THIS WILL OVERWRITE EXISTING
PARTITIONS!!
Do you want to proceed? (Y/N): y

• 念のためOS再起動した。