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vo 在 VG myvdb 內，大小為 89M ( 100M )。
[root@kvm10 ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/vg_kvm10-root 4.3G 3.1G 1.2G 73% / devtmpfs 4.0M 0 4.0M 0% /dev tmpfs 853M 0 853M 0% /dev/shm tmpfs 342M 4.9M 337M 2% /run tmpfs 1.0M 0 1.0M 0% /run/credentials/systemd-journald.service /dev/vda2 436M 211M 226M 49% /boot /dev/mapper/myvdb-vo 89M 14K 82M 1% /reports tmpfs 1.0M 0 1.0M 0% /run/credentials/getty@tty1.service tmpfs 171M 8.0K 171M 1% /run/user/0
[root@kvm10 ~]# ll /dev/myvdb/vo lrwxrwxrwx. 1 root root 7 Dec 4 14:09 /dev/myvdb/vo -> ../dm-2 [root@kvm10 ~]# ll /dev/mapper/myvdb-vo lrwxrwxrwx. 1 root root 7 Dec 4 14:09 /dev/mapper/myvdb-vo -> ../dm-2
vo 大小改為 50M，其中選項 –resize2fs 是同時 resize ext 檔案系統的大小。
[root@kvm10 ~]# lvresize -L 50M --resizefs /dev/mapper/myvdb-vo Rounding size to boundary between physical extents: 52.00 MiB. File system ext4 found on myvdb/vo mounted at /reports. File system size (100.00 MiB) is larger than the requested size (52.00 MiB). File system reduce is required using resize2fs. File system unmount is needed for reduce. File system fsck will be run before reduce. Continue with ext4 file system reduce steps: unmount, fsck, resize2fs? [y/n]:y Reducing file system ext4 to 52.00 MiB (54525952 bytes) on myvdb/vo... unmount /reports unmount done e2fsck /dev/myvdb/vo /dev/myvdb/vo: 11/25584 files (0.0% non-contiguous), 12081/102400 blocks e2fsck done resize2fs /dev/myvdb/vo 53248k resize2fs 1.47.1 (20-May-2024) Resizing the filesystem on /dev/myvdb/vo to 53248 (1k) blocks. The filesystem on /dev/myvdb/vo is now 53248 (1k) blocks long. resize2fs done remount /dev/myvdb/vo /reports remount done Reduced file system ext4 on myvdb/vo. Size of logical volume myvdb/vo changed from 100.00 MiB (25 extents) to 52.00 MiB (13 extents). Logical volume myvdb/vo successfully resized.
myvdb-vo 大小為 44M ( 50M )。
[root@kvm10 ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/vg_kvm10-root 4.3G 3.1G 1.2G 73% / devtmpfs 4.0M 0 4.0M 0% /dev tmpfs 853M 0 853M 0% /dev/shm tmpfs 342M 4.9M 337M 2% /run tmpfs 1.0M 0 1.0M 0% /run/credentials/systemd-journald.service /dev/vda2 436M 211M 226M 49% /boot tmpfs 1.0M 0 1.0M 0% /run/credentials/getty@tty1.service tmpfs 171M 8.0K 171M 1% /run/user/0 /dev/mapper/myvdb-vo 44M 14K 40M 1% /reports
myvdb-vo 大小改為 250M，不用理會是放大還是縮小，其中 –resizefs 選項是一併執行 resize2fs 的命令。
[root@kvm10 ~]# lvresize -L 250M --resizefs /dev/mapper/myvdb-vo Rounding size to boundary between physical extents: 252.00 MiB. File system ext4 found on myvdb/vo mounted at /reports. Size of logical volume myvdb/vo changed from 52.00 MiB (13 extents) to 252.00 MiB (63 extents). Extending file system ext4 to 252.00 MiB (264241152 bytes) on myvdb/vo... resize2fs /dev/myvdb/vo resize2fs 1.47.1 (20-May-2024) Filesystem at /dev/myvdb/vo is mounted on /reports; on-line resizing required old_desc_blocks = 1, new_desc_blocks = 2 The filesystem on /dev/myvdb/vo is now 258048 (1k) blocks long. resize2fs done Extended file system ext4 on myvdb/vo.
myvdb-vo 大小為 231M ( 250M )。
[root@kvm10 ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/vg_kvm10-root 4.3G 3.1G 1.2G 73% / devtmpfs 4.0M 0 4.0M 0% /dev tmpfs 853M 0 853M 0% /dev/shm tmpfs 342M 4.9M 337M 2% /run tmpfs 1.0M 0 1.0M 0% /run/credentials/systemd-journald.service /dev/vda2 436M 211M 226M 49% /boot tmpfs 1.0M 0 1.0M 0% /run/credentials/getty@tty1.service tmpfs 171M 8.0K 171M 1% /run/user/0 /dev/mapper/myvdb-vo 231M 14K 220M 1% /reports