最後更新: 2022-02-16

目錄

• Online resize disk
• logical_block_size & physical_block_size

logical_block_size & physical_block_size

For Linux this would be the value returned by the

BLKSSZGET (logical_block_size) ioctl and describes the smallest units for disk I/O.

BLKPBSZGET (physical_block_size) ioctl and describes the disk's hardware sector size which can be relevant for the alignment of disk data.

XML

<disk type='block' device='disk'>
  ...
  <blockio logical_block_size='512' physical_block_size='4096'/>
</disk>

Online resize disk

1. 查看 Instance 的 disk image path 及 device name

virsh qemu-monitor-command lxc-r8 --hmp "info block"

drive-scsi0-0-0-1 (#block326): /mnt/raid/lxc-r8/data.raw (raw)
    Attached to:      scsi0-0-0-1
    Cache mode:       writeback

2. 查看 image size

qemu-img info /mnt/raid/lxc-r8/data.raw

image: /mnt/raid/lxc-r8/data.raw
file format: raw
virtual size: 20G (21474836480 bytes)
disk size: 2.5G

3. resize

virsh qemu-monitor-command lxc-r8 --hmp "block_resize drive-scsi0-0-0-1 30G"

qemu-img info /mnt/raid/lxc-r8/data.raw

image: /mnt/raid/lxc-r8/data.raw
file format: raw
virtual size: 30G (32212254720 bytes)
disk size: 2.5G