Create volume fails with EMC VNX driver

[Sridhar Venkat]

EMC VNX driver is used to create volume and it fails. We have a storage pool of free space 200GB and when a volume of size 200GB was created, it failed with this error message :
2014-09-01 08:14:32.174 3898 ERROR cinder.exception [req-0eff464d-12dc-447d-ae04-e302287e2275 0 2aa5b39aba934359a1c9114adcdec5e9 - - -] EMCVnxCLICmdError : ['lun', '-create', '-capacity', 200, '-sq', 'gb', '-sp', 'a', '-poolName', 'PowerVC_0', '-name', u'volume-7a1c76ea-e7aa-4bd8-a0dd-5f735a712953', '-type', 'NonThin'] (Return Code: 9) (Output: ['There is insufficient free space in the pool to complete the operation. Please add storage to the Pool and retry. (0x712d8709)\\n'])

We determine free space in pool by parsing -userCap value of command :
storagepool -list -availableCap -userCap -state

This command reports userCap of 200GB.

[Jeegn Chen (jeegn-chen)]

Hi Srihdar,

You mentioned "This command reports userCap of 200GB".
Do you mean "availableCap" here or not?
I ask this because userCap is total but not necessarily free.

Thanks,
Jeegn

[Sridhar Venkat (svenkat)]

Hi Chen,
You are right, we use -avilableCap to determine free space. Sorry about this confusion.

[Sridhar Venkat (svenkat)]

Any updates on this problem?

[Jeegn Chen (jeegn-chen)]

Return reserved_percentage to make scheduler take the overhead used by meta data into consideration

Fixed as part of https://review.openstack.org/#/c/141629/