1.The minimum unit of volume size is gigabytes(G) and the default operation unit of lvextend command is megabytes(M).
2.On a openstack env using cinder lvm driver, extend volume from 1G to 2G.
Fail infomartion as following:
1)volume status:error_extending
root@ubuntu-02:/var/log/cinder# cinder list
+--------------------------------------+-----------------+-------------------+------+-------------+----------+--------------------------------------+
| ID | Status | Display Name | Size | Volume Type | Bootable | Attached to |
+--------------------------------------+-----------------+-------------------+------+-------------+----------+--------------------------------------+
| 98cc90d5-391d-46b0-8c47-e73b38544cd2 | in-use | test | 1 | None | false | 46451812-c59d-4fe4-8283-c270162389c7 |
| cd47bca4-1604-4f0e-8b62-38cc503616ba | error_extending | test_volume_owner | 1 | None | false | |
+--------------------------------------+-----------------+-------------------+------+-------------+----------+--------------------------------------+
2)according to cinder-volume log,it seemed that error happened in dismatch volume size.
2013-10-16 23:57:59.468 18303 TRACE cinder.brick.local_dev.lvm Command: sudo cinder-rootwrap /etc/cinder/rootwrap.conf lvextend -L 2 cinder-volumes/volume-cd47bca4-1604-4f0e-8b62-38cc503616ba
2013-10-16 23:57:59.468 18303 TRACE cinder.brick.local_dev.lvm Exit code: 3
2013-10-16 23:57:59.468 18303 TRACE cinder.brick.local_dev.lvm Stdout: ' Rounding up size to full physical extent 4.00 MiB\n'
2013-10-16 23:57:59.468 18303 TRACE cinder.brick.local_dev.lvm Stderr: " New size given (1 extents) not larger than existing size (256 extents)\n Run `lvextend --help' for more information.\n"
2013-10-16 23:57:59.468 18303 TRACE cinder.brick.local_dev.lvm
Already how to fix this bug!