Ubuntu根分区扩容

Ubuntu在安装完系统后，发现根分区的可用空间和实际硬盘大小不一致。

我硬盘是119G，根分区只有57G

root@i3-5010u:~# fdisk -l /dev/sdb
Disk /dev/sdb: 119.24 GiB, 128035676160 bytes, 250069680 sectors
Disk model: TOSHIBA THNSNJ12
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: 35B03760-1D46-4508-BEC5-E499FC7778FA

Device       Start       End   Sectors   Size Type
/dev/sdb1     2048   2203647   2201600     1G EFI System
/dev/sdb2  2203648   6397951   4194304     2G Linux filesystem
/dev/sdb3  6397952 250066943 243668992 116.2G Linux filesystem
root@i3-5010u:~# df -h
Filesystem                         Size  Used Avail Use% Mounted on
tmpfs                              783M  5.1M  778M   1% /run
efivarfs                           128K  101K   23K  82% /sys/firmware/efi/efivars
/dev/mapper/ubuntu--vg-ubuntu--lv   57G   48G  6.6G  88% /
tmpfs                              3.9G     0  3.9G   0% /dev/shm
tmpfs                              5.0M     0  5.0M   0% /run/lock
/dev/sdb2                          2.0G  270M  1.6G  15% /boot
/dev/sdb1                          1.1G  6.2M  1.1G   1% /boot/efi
/dev/sda                           458G  4.0G  431G   1% /data
tmpfs                              783M   12K  783M   1% /run/user/0

查看lvm的信息，显示PV和VG里有58G没有被使用。

不知道Ubuntu为啥要保留这部分空间。

root@i3-5010u:~# pvs
  PV         VG        Fmt  Attr PSize    PFree
  /dev/sdb3  ubuntu-vg lvm2 a--  <116.19g 58.09g
root@i3-5010u:~# vgs
  VG        #PV #LV #SN Attr   VSize    VFree
  ubuntu-vg   1   1   0 wz--n- <116.19g 58.09g
root@i3-5010u:~# lvs
  LV        VG        Attr       LSize  Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  ubuntu-lv ubuntu-vg -wi-ao---- 58.09g

接下来把lv扩容

注意：操作有风险，建议备份数据

root@i3-5010u:~# lvextend -l +100%FREE /dev/ubuntu-vg/ubuntu-lv
  Size of logical volume ubuntu-vg/ubuntu-lv changed from 58.09 GiB (14872 extents) to <116.19 GiB (29744 extents).
  Logical volume ubuntu-vg/ubuntu-lv successfully resized.

扩容系统分区

root@i3-5010u:~# resize2fs /dev/ubuntu-vg/ubuntu-lv
resize2fs 1.47.0 (5-Feb-2023)
Filesystem at /dev/ubuntu-vg/ubuntu-lv is mounted on /; on-line resizing required
old_desc_blocks = 8, new_desc_blocks = 15
The filesystem on /dev/ubuntu-vg/ubuntu-lv is now 30457856 (4k) blocks long.

接下来在查看分区空间情况，这些就正常了。

root@i3-5010u:~# df -h
Filesystem                         Size  Used Avail Use% Mounted on
tmpfs                              783M  5.1M  778M   1% /run
efivarfs                           128K  101K   23K  82% /sys/firmware/efi/efivars
/dev/mapper/ubuntu--vg-ubuntu--lv  115G   48G   62G  44% /
tmpfs                              3.9G     0  3.9G   0% /dev/shm
tmpfs                              5.0M     0  5.0M   0% /run/lock
/dev/sdb2                          2.0G  270M  1.6G  15% /boot
/dev/sdb1                          1.1G  6.2M  1.1G   1% /boot/efi
/dev/sda                           458G  4.0G  431G   1% /data
tmpfs                              783M   12K  783M   1% /run/user/0

CreateBy：2024-07-12T18:34:39+08:00，UpdateBy：2024-07-12T18:47:32+08:00

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