Open Stack

Hello,

We are having this issue in production and I have since pushed for a fix
for this.

We solved it by removing the DiskFilter filter, ignore any RT data from
nova and seen in horizon and keep close monitoring on our block storage
usage.

nova.conf:

#scheduler_default_filters = RetryFilter, AvailabilityZoneFilter,
RamFilter, DiskFilter, ComputeFilter, ComputeCapabilitiesFilter,
ImagePropertiesFilter, ServerGroupAntiAffinityFilter,
ServerGroupAffinityFilter
scheduler_default_filters = RetryFilter, AvailabilityZoneFilter,
RamFilter, ComputeFilter, ComputeCapabilitiesFilter,
ImagePropertiesFilter, ServerGroupAntiAffinityFilter,
ServerGroupAffinityFilter

Default options is the one commented out, the other one has DiskFilter
removed.

We haven't had any issues after removing the DiskFilter.


Best regards


On 08/15/2016 10:17 AM, Kostiantyn.Volenbovskyi at swisscom.com wrote:
> Hi, 
>
> Just to add that this bug was recently brought up in openstack-dev [1]
>
> it sounds that you are waiting for fix via [2] or, probably more likely [3] 
> Disabling DiskFilter sounds like OK workaround in case your VMs are never booted from image in your OpenStack Region(s).
> But if I understand the fault - the migrate/resize/live migrate/rebuild/evacuate will not work because
> . assuming that on target Compute Host you don't have local disk - and your flavor has more than 0 GB for root and/or ephemeral disk 
> -it would fail. 
>
> So I would say that setting your root disk space to '0' in the flavor might be a better workaround
>
> BR, 
> Konstantin
> [1] http://lists.openstack.org/pipermail/openstack-dev/2016-August/101566.html 
> [2] https://review.openstack.org/#/c/200870/
> [3] https://review.openstack.org/#/c/355091/
>
>
>> -----Original Message-----
>> From: William Josefsson [mailto:william.josefson at gmail.com]
>> Sent: Sunday, August 14, 2016 5:47 PM
>> To: openstack-operators at lists.openstack.org
>> Subject: [Openstack-operators] DiskFilter Disabled - No valid host was found
>>
>> Hello, I got Error, no valid host was found while trying to provision and I could in
>> nova-scheduler.log see that the DiskFilter failed to find a compute host. My OS is
>> CentOS7/ running Liberty.
>>
>> If I'm not mistaken, it is a bug that DiskFilter checks space available on compute-
>> host / partition even when I'm using iSCSI and RBD backends. The / is no way
>> near full.
>> https://bugs.launchpad.net/nova/+bug/1358566
>>
>> Can anyone confirm whether it is fine to disable DiskFilter if I'm using iSCSI and
>> RBD backend or would anything else brake? thx will
>>
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