ceph rbd在线resize的示例分析

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ceph rbd在线resize

扩容前

[root@mon0 ceph]# rbd create myrbd/rbd1 -s 1024 --image-format=2[root@mon0 ceph]# rbd ls myrbdrbd1[root@mon0 ceph]# rbd info myrbd/rbd1rbd image 'rbd1':        size 1024 MB in 256 objects        order 22 (4096 kB objects)        block_name_prefix: rbd_data.12ce6b8b4567        format: 2        features: layering

扩容

[root@mon0 ceph]# rbd resize myrbd/rbd1 -s 2048Resizing image: 100% complete...done.

在rbd1未格式化和挂载之前，直接resize就可以了。如果rbd1已经格式化并挂载了，需要一些额外的操作：

[root@mon0 ceph]# rbd map myrbd/rbd1[root@mon0 ceph]# rbd showmappedid pool  image    snap device    0  test  test.img -    /dev/rbd0 1  myrbd rbd1     -    /dev/rbd1 [root@mon0 ceph]# mkfs.xfs /dev/rbd1log stripe unit (4194304 bytes) is too large (maximum is 256KiB)log stripe unit adjusted to 32KiBmeta-data=/dev/rbd1              isize=256    agcount=9, agsize=64512 blks         =                       sectsz=512   attr=2, projid32bit=0data     =                       bsize=4096   blocks=524288, imaxpct=25         =                       sunit=1024   swidth=1024 blksnaming   =version 2              bsize=4096   ascii-ci=0log      =internal log           bsize=4096   blocks=2560, version=2         =                       sectsz=512   sunit=8 blks, lazy-count=1realtime =none                   extsz=4096   blocks=0, rtextents=0[root@mon0 ceph]# mount /dev/rbd1 /mnt[root@mon0 ceph]# df -hFilesystem      Size  Used Avail Use% Mounted on/dev/sda1       529G   20G  482G   4% /tmpfs            16G  408K   16G   1% /dev/shm/dev/sdb        559G   33G  527G   6% /openstack/dev/sdc        1.9T   75M  1.9T   1% /cephmp1/dev/sdd        1.9T   61M  1.9T   1% /cephmp2/dev/rbd1       2.0G   33M  2.0G   2% /mnt[root@mon0 ceph]# rbd resize myrbd/rbd1 -s 4096Resizing image: 100% complete...done.[root@mon0 ceph]# df -hFilesystem      Size  Used Avail Use% Mounted on/dev/sda1       529G   20G  482G   4% /tmpfs            16G  408K   16G   1% /dev/shm/dev/sdb        559G   33G  527G   6% /openstack/dev/sdc        1.9T   75M  1.9T   1% /cephmp1/dev/sdd        1.9T   61M  1.9T   1% /cephmp2/dev/rbd1       2.0G   33M  2.0G   2% /mnt[root@mon0 ceph]# xfs_growfs /mntmeta-data=/dev/rbd1              isize=256    agcount=9, agsize=64512 blks         =                       sectsz=512   attr=2, projid32bit=0data     =                       bsize=4096   blocks=524288, imaxpct=25         =                       sunit=1024   swidth=1024 blksnaming   =version 2              bsize=4096   ascii-ci=0log      =internal               bsize=4096   blocks=2560, version=2         =                       sectsz=512   sunit=8 blks, lazy-count=1realtime =none                   extsz=4096   blocks=0, rtextents=0data blocks changed from 524288 to 1048576[root@mon0 ceph]# df -hFilesystem      Size  Used Avail Use% Mounted on/dev/sda1       529G   20G  482G   4% /tmpfs            16G  408K   16G   1% /dev/shm/dev/sdb        559G   33G  527G   6% /openstack/dev/sdc        1.9T   75M  1.9T   1% /cephmp1/dev/sdd        1.9T   61M  1.9T   1% /cephmp2/dev/rbd1       4.0G   33M  4.0G   1% /mnt

还有一种情况是，rbd1已经被挂载到一个vm上：

virsh domblklist myvmrbd resize myrbd/rbd1#这里需要通过virsh blockresize进行操作virsh blockresize --domain myvm --path vdb --size 100Grbd info myrbd/rbd1

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