测试步骤：
- 创建一个1G大小的卷：
cinder create --name wangyue01 --volume-type netapp_volume_type 1 - 扩容到100G：
cinder extend wangyue01 100 - 查看卷状态变成 error_extending
- 检查cinder-volume.log日志：
2017-07-28 15:13:07.410 87 ERROR cinder.volume.manager return f(*args, **kwargs)
2017-07-28 15:13:07.410 87 ERROR cinder.volume.manager File "/var/lib/kolla/venv/lib/python2.7/site-packages/cinder/volume/drivers/netapp/dataontap/client/client_cmode.py", line 507, in clone_lun
2017-07-28 15:13:07.410 87 ERROR cinder.volume.manager self.connection.invoke_successfully(clone_create, True)
2017-07-28 15:13:07.410 87 ERROR cinder.volume.manager File "/var/lib/kolla/venv/lib/python2.7/site-packages/cinder/volume/drivers/netapp/dataontap/client/api.py", line 227, in invoke_successfully
2017-07-28 15:13:07.410 87 ERROR cinder.volume.manager raise NaApiError(code, msg)
2017-07-28 15:13:07.410 87 ERROR cinder.volume.manager NaApiError: NetApp API failed. Reason - 17161:Clone operation failed to start: Partial 'File restore or LUN clone' operations are not supported on secondary compression enabled volumes.
问题确认：
看起来是netapp的api返回空间不足了！
在netapp命令行界面，可用指令lun show -instance xxxx检查lun的最大扩展限制
NetApp2650::lun> lun show -instance /vol/vol_09052017_154346_88/volume-bad235e0-6e2c-47ce-973e-9ecde458a32f
Vserver Name: bm_test_svm
LUN Path: /vol/vol_09052017_154346_88/volume-bad235e0-6e2c-47ce-973e-9ecde458a32f
Volume Name: vol_09052017_154346_88
Qtree Name: ""
LUN Name: volume-bad235e0-6e2c-47ce-973e-9ecde458a32f
LUN Size: 1GB
OS Type: linux
Space Reservation: enabled
Serial Number: 808ta$Jb4Oc3
Serial Number (Hex): 3830387461244a62344f6333
Comment:
Space Reservations Honored: false
Space Allocation: disabled
State: online
LUN UUID: c0bfbbde-ff3d-4ced-a0b0-130cb09b6c12
Mapped: unmapped
Block Size: 512
Device Legacy ID: -
Device Binary ID: -
Device Text ID: -
Read Only: false
Fenced Due to Restore: false
Used Size: 0
Maximum Resize Size: 64.00GB
Creation Time: 7/28/2017 15:52:41
Class: regular
Node Hosting the LUN: NetApp2650-01
QoS Policy Group: -
Caching Policy Name: -
Clone: false
Clone Autodelete Enabled: false
Inconsistent Import: false
可以看到 Maximum Resize Size: 64.00GB ，最大才64GB，难怪我们扩容到100G会有限制。
测试发现：
| lun size | Maximum Resize Size |
|---|---|
| 1GB-10GB | 64GB |
| 11GB | 128GB |
| 20GB | 256GB |
| 30GB | 320GB |
| 40GB | 448GB |
规律不是很明确。文档里也没用提示。
另外，测试发现，只有创建LUN的时候选择为此 LUN 选择一个现有的卷或 qtree的时候才有最大扩容限制，如果选用为此 LUN 选择一个现有的卷或 qtree来创建，则没有限制。cinder调用netapp api创建lun，用的是为此 LUN 选择一个现有的卷或 qtree。
图片.png
华为存储是没有这种问题的
如果卷状态变成 error_extending，如何恢复可用？
用指令修改状态为available
cinder reset-state 142b3c02-2127-4ab8-b692-d52a0c2bbb70 --state available
只要扩容前的卷状态是available，那么是可以正常恢复的。
