ext4 filesystem logical volume resizing# Operation System/Linux2021. 4. 21. 09:16
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lvm으로 합쳤던 디스크를 사이즈 줄이고 새로 마운트해야할일이 있어서 아래와 같이 진행하였습니다.
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# df -Th
Filesystem Type Size Used Avail Use% Mounted on
devtmpfs devtmpfs 7.8G 0 7.8G 0% /dev
tmpfs tmpfs 7.8G 0 7.8G 0% /dev/shm
tmpfs tmpfs 7.8G 8.8M 7.8G 1% /run
tmpfs tmpfs 7.8G 0 7.8G 0% /sys/fs/cgroup
/dev/mapper/centos-root ext4 9.8G 1.9G 7.4G 21% /
/dev/sda1 xfs 1014M 195M 820M 20% /boot
/dev/mapper/centos-apps ext4 425G 70M 403G 1% /apps
tmpfs tmpfs 1.6G 0 1.6G 0% /run/user/0
# vgs
VG #PV #LV #SN Attr VSize VFree
centos 2 3 0 wz--n- 448.99g 0
# pvs
PV VG Fmt Attr PSize PFree
/dev/sda2 centos lvm2 a-- <149.00g 0
/dev/sdb1 centos lvm2 a-- <300.00g 0
# lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
apps centos -wi-ao---- <431.12g
root centos -wi-ao---- 10.00g
swap centos -wi-ao---- <7.88g
# lvreduce -L -300G /dev/centos/apps
WARNING: Reducing active logical volume to <131.12 GiB.
THIS MAY DESTROY YOUR DATA (filesystem etc.)
Do you really want to reduce centos/apps? [y/n]: y
Size of logical volume centos/apps changed from <431.12 GiB (110366 extents) to <131.12 GiB (33566 extents).
Logical volume centos/apps successfully resized.
# lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
apps centos -wi-a----- <131.12g
root centos -wi-ao---- 10.00g
swap centos -wi-ao---- <7.88g
# pvs
PV VG Fmt Attr PSize PFree
/dev/sda2 centos lvm2 a-- <149.00g 4.00m
/dev/sdb1 centos lvm2 a-- <300.00g <300.00g
# mkfs.ext4 /dev/centos/apps
mke2fs 1.42.9 (28-Dec-2013)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
8593408 inodes, 34371584 blocks
1718579 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=2183135232
1049 block groups
32768 blocks per group, 32768 fragments per group
8192 inodes per group
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
4096000, 7962624, 11239424, 20480000, 23887872
Allocating group tables: done
Writing inode tables: done
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done
# mount /apps
# df -Th
Filesystem Type Size Used Avail Use% Mounted on
devtmpfs devtmpfs 7.8G 0 7.8G 0% /dev
tmpfs tmpfs 7.8G 0 7.8G 0% /dev/shm
tmpfs tmpfs 7.8G 8.8M 7.8G 1% /run
tmpfs tmpfs 7.8G 0 7.8G 0% /sys/fs/cgroup
/dev/mapper/centos-root ext4 9.8G 1.9G 7.4G 21% /
/dev/sda1 xfs 1014M 195M 820M 20% /boot
tmpfs tmpfs 1.6G 0 1.6G 0% /run/user/0
/dev/mapper/centos-apps ext4 129G 61M 123G 1% /apps
# mkdir -p /data
# pvs
PV VG Fmt Attr PSize PFree
/dev/sda2 centos lvm2 a-- <149.00g 4.00m
/dev/sdb1 centos lvm2 a-- <300.00g <300.00g
# lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
apps centos -wi-ao---- <131.12g
root centos -wi-ao---- 10.00g
swap centos -wi-ao---- <7.88g
# pvscan
PV /dev/sda2 VG centos lvm2 [<149.00 GiB / 4.00 MiB free]
PV /dev/sdb1 VG centos lvm2 [<300.00 GiB / <300.00 GiB free]
Total: 2 [448.99 GiB] / in use: 2 [448.99 GiB] / in no VG: 0 [0 ]
# lvcreate -n data -l +100%FREE centos
Logical volume "data" created.
# lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
apps centos -wi-ao---- <131.12g
data centos -wi-a----- 300.00g
root centos -wi-ao---- 10.00g
swap centos -wi-ao---- <7.88g
# mkfs.ext
mkfs.ext2 mkfs.ext3 mkfs.ext4
# mkfs.ext4 /dev/centos/data
mke2fs 1.42.9 (28-Dec-2013)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
19660800 inodes, 78643200 blocks
3932160 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=2227175424
2400 block groups
32768 blocks per group, 32768 fragments per group
8192 inodes per group
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
4096000, 7962624, 11239424, 20480000, 23887872, 71663616
Allocating group tables: done
Writing inode tables: done
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done
# mount -t ext4 /dev/centos/data /data
# df -Th
Filesystem Type Size Used Avail Use% Mounted on
devtmpfs devtmpfs 7.8G 0 7.8G 0% /dev
tmpfs tmpfs 7.8G 0 7.8G 0% /dev/shm
tmpfs tmpfs 7.8G 8.9M 7.8G 1% /run
tmpfs tmpfs 7.8G 0 7.8G 0% /sys/fs/cgroup
/dev/mapper/centos-root ext4 9.8G 1.9G 7.4G 21% /
/dev/sda1 xfs 1014M 195M 820M 20% /boot
tmpfs tmpfs 1.6G 0 1.6G 0% /run/user/0
/dev/mapper/centos-apps ext4 129G 61M 123G 1% /apps
/dev/mapper/centos-data ext4 296G 65M 281G 1% /data
# vi /etc/fstab
#
# /etc/fstab
# Created by anaconda on Tue Apr 20 13:35:55 2021
#
# Accessible filesystems, by reference, are maintained under '/dev/disk'
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
/dev/mapper/centos-root / ext4 defaults 1 1
/dev/mapper/centos-apps /apps ext4 defaults 1 2
/dev/mapper/centos-data /data ext4 defaults 1 2
UUID=a231425f-fbd8-4e0d-b231-3e04bcb82390 /boot xfs defaults 0 0
/dev/mapper/centos-swap swap swap defaults 0 0
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