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QEMU 硬盘扩容

泠泫凝发表于 2024-11-08 07:30:10

扩容PVE虚拟机硬盘及系统内操作，可能适用于其他虚拟化平台。

首先在PVE虚拟机-硬件-选中硬盘-硬盘操作-调整大小，然后在新跳出的对话框里面输入你需要扩大的大小。注意是需要扩大多少不是扩大到多少，PVE允许在虚拟机运行时扩大磁盘容量。

我这里以ubuntu 20.04为例；扩大的磁盘为系统盘；/dev/sda2挂载为/（root），分区类型为Ext4。

PVE界面上扩容好后使用fdisk -l查看当前磁盘情况：

GPT PMBR size mismatch (2147483647 != 8589934591) will be corrected by write.
The backup GPT table is not on the end of the device. This problem will be corrected by write.
Disk /dev/sda: 4 TiB, 4398046511104 bytes, 8589934592 sectors
Disk model: QEMU HARDDISK   
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: C21E9F23-xxxx-xxxx-xxxx-EA78EC110E55

Device       Start        End    Sectors  Size Type
/dev/sda1     2048    2203647    2201600  1.1G EFI System
/dev/sda2  2203648 2147481599 2145277952 1023G Linux filesystem

会发现提示分区表磁盘大小不匹配，执行resize2fs也会提示没有可用空间：

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root@xxxx:~# resize2fs /dev/sda2
resize2fs 1.45.5 (07-Jan-2020)
The filesystem is already 268159744 (4k) blocks long.  Nothing to do!

此时执行parted -l，会提示有分区表错误，是否修复，输入fix即可。

root@node3:~# parted -l
Warning: Not all of the space available to /dev/sda appears to be used, you can
fix the GPT to use all of the space (an extra 6442450944 blocks) or continue
with the current setting? 
Fix/Ignore? fix                                                           
Model: QEMU QEMU HARDDISK (scsi)
Disk /dev/sda: 4398GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags: 

Number  Start   End     Size    File system  Name  Flags
 1      1049kB  1128MB  1127MB  fat32              boot, esp
 2      1128MB  1100GB  1098GB