ceph rbd扩容
1、查看当前image大小# rbd showmapped
id pool image snap device
0rbdfoo - /dev/rbd0
# rbd info foo
rbd image 'foo':
size 15360 MB in 3840 objects
order 22 (4096 kB objects)
block_name_prefix: rb.0.1026.238e1f29
format: 1
# df -Th
Filesystem Type SizeUsed Avail Use% Mounted on
/dev/mapper/rhel-root xfs 29G3.8G 25G14% /
devtmpfs devtmpfs2.0G 02.0G 0% /dev
tmpfs tmpfs 2.0G 88K2.0G 1% /dev/shm
tmpfs tmpfs 2.0G8.8M2.0G 1% /run
tmpfs tmpfs 2.0G 02.0G 0% /sys/fs/cgroup
/dev/sda1 xfs 497M106M392M22% /boot
/dev/rbd0 ext4 15G1.1G 13G 8% /mnt
可以看出当前大小为15G
2、扩容到20G
# rbd resize --size 20480 foo
Resizing image: 100% complete...done.
# df -Th
Filesystem Type SizeUsed Avail Use% Mounted on
/dev/mapper/rhel-root xfs 29G3.8G 25G14% /
devtmpfs devtmpfs2.0G 02.0G 0% /dev
tmpfs tmpfs 2.0G 88K2.0G 1% /dev/shm
tmpfs tmpfs 2.0G8.8M2.0G 1% /run
tmpfs tmpfs 2.0G 02.0G 0% /sys/fs/cgroup
/dev/sda1 xfs 497M106M392M22% /boot
/dev/rbd0 ext4 15G1.1G 13G 8% /mnt
此时文件系统还未增大
# blockdev --getsize64 /dev/rbd0
21474836480
# resize2fs /dev/rbd0
resize2fs 1.42.9 (28-Dec-2013)
Filesystem at /dev/rbd0 is mounted on /mnt; on-line resizing required
old_desc_blocks = 2, new_desc_blocks = 3
The filesystem on /dev/rbd0 is now 5242880 blocks long.
# df -Th
Filesystem Type SizeUsed Avail Use% Mounted on
/dev/mapper/rhel-root xfs 29G3.8G 25G14% /
devtmpfs devtmpfs2.0G 02.0G 0% /dev
tmpfs tmpfs 2.0G 88K2.0G 1% /dev/shm
tmpfs tmpfs 2.0G8.8M2.0G 1% /run
tmpfs tmpfs 2.0G 02.0G 0% /sys/fs/cgroup
/dev/sda1 xfs 497M106M392M22% /boot
/dev/rbd0 ext4 20G1.1G 18G 6% /mnt
成功
此方法只对格式化为EXT4文件系统的块设备有效。对于XFS，要在 resize之后执行
# xfs_growfs /mnt
***如果rbd用于kvm虚机，扩容后vm容量不会自动扩展////
1、先关闭虚拟机
2、unmap再map
# rbd unmap /dev/rbd0
# rbd showmapped
# rbd map foo
/dev/rbd0
3、启动虚机
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