Volume create fails with FakeISCSIDriver

[Ollie Leahy]

Volume create fails when the FakeISCSIDriver is used, because the scheduler capacity filter detects that capacity on the fake backend is zero.

If you try to create a volume using the fake backend you'll see this message in the file cinder-scheduler.log

2016-02-08 13:06:36.978 2546 WARNING cinder.scheduler.filters.capacity_filter [req-97dd295a-cd50-420c-b8a6-a99d3614c8d3 3193c796bfa74c27b573d2235e5192b7 a16d917aad8446018985583054979f17 - - -] Insufficient free space for volume creation. Total capacity is 0.00 on host ha-volume-manager@fake-1#FAKE.

The follow patch allows volumes to be created:

$ git diff
diff --git a/cinder/volume/driver.py b/cinder/volume/driver.py
index 378b2a5..178910f 100644
--- a/cinder/volume/driver.py
+++ b/cinder/volume/driver.py
@@ -2634,8 +2634,8 @@ class FakeISCSIDriver(ISCSIDriver):
         fake_pool = {}
         fake_pool.update(dict(
             pool_name=data["volume_backend_name"],
- total_capacity_gb=0,
- free_capacity_gb=0,
+ total_capacity_gb='infinite',
+ free_capacity_gb='infinite',
             provisioned_capacity_gb=0,
             reserved_percentage=100,
             QoS_support=False,

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/277619

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/277619
Committed: https://git.openstack.org/cgit/openstack/cinder/commit/?id=902558215ed3fdd8cdfcedd3244189ec75eea25b
Submitter: Jenkins
Branch: master

commit 902558215ed3fdd8cdfcedd3244189ec75eea25b
Author: scottda <email address hidden>
Date: Mon Feb 8 16:59:34 2016 -0700

    Volume create fails with FakeISCSIDriver

    Volume create fails when the FakeISCSIDriver is used, because the
    scheduler capacity filter detects that capacity on the fake backend
    is zero. Change the total_capacity and free_capacity_gb for the
    FakeISCSIDriver from 0 to infinite.

    Change-Id: Ifedd483a660aefef89a85e6a55b2c0a5ca50c7d5
    Closes-Bug: #1543171

[Doug Hellmann (doug-hellmann)]

This issue was fixed in the openstack/cinder 8.0.0.0b3 development milestone.