Open Stack

Hey Sam,

When you say it occurs every 10 minutes, what exactly do you mean?  The 
quota refresh?  Or a quota getting out of sync?

I am surprised you have max_age set so low.  I would think that would 
basically trigger a quota refresh on every single reservation for most 
users, right?

Mike





On 3/20/15, 4:18 AM, "Sam Morrison" <sorrison at gmail.com> wrote:

>We’ve had the following for a year or so but doesn’t help much, we still 
>see it occurring every 10 mins or so.
>
>max_age = 10
>until_refresh = 5
>reservation_expire=600
>
>We have a cron job that runs every 10 mins that figures out what projects 
>are out of sync and corrects them.
>We’ve always been scared of setting these to zero but we probably should.
>
>Sam
>
>
>> On 15 Mar 2015, at 2:53 pm, Mike Dorman <mdorman at godaddy.com> wrote:
>> 
>> Yeah the default is just ‘0’ for both, which disables the refresh.
>> 
>> 
>> 
>> The one downside is that it may not be 100% transparent to the user.  
>>If 
>> the quota is already (incorrectly) too high, and exceeding the quota 
>> limit, the reservation that triggers the refresh will still fail.  I.e. 
>> the reservation is attempted based on the quota usage values _before_ 
>>the 
>> refresh.  But then after that the quota should be fixed and it will 
>>work 
>> again on the next reservation.
>> 
>> But my thinking is that most quota issues happen slowly over time.  If 
>>we 
>> are correcting them often and automatically, they hopefully never get 
>>to 
>> the point where they’re bad enough to manifest reservation errors to 
>>the 
>> user.
>> 
>> I don’t have any information re: db load.  I assume it regenerates 
>>based 
>> on what’s in the instances or reservations table.  I imagine the load 
>>for 
>> doing a single refresh is probably comparable to doing a ‘nova list’.
>> 
>> Mike
>> 
>> 
>> 
>> On 3/14/15, 2:27 PM, "Tim Bell" <Tim.Bell at cern.ch> wrote:
>> 
>>> Interesting... what are the defaults ?
>>> 
>>> Assuming no massive DB load, getting synced within a day would seem 
>>> reasonable. Is the default no max age ?
>>> 
>>> Tim
>>> 
>>>> -----Original Message-----
>>>> From: Jesse Keating [mailto:jlk at bluebox.net]
>>>> Sent: 14 March 2015 16:59
>>>> To: openstack-operators at lists.openstack.org
>>>> Subject: Re: [Openstack-operators] max_age and until_refresh for 
>>>>fixing 
>>>> Nova
>>>> quotas
>>>> 
>>>> On 3/14/15 8:11 AM, Mike Dorman wrote:
>>>>> I did short write-up here http://t.co/Q5X1hTgJG1 if you are 
>>>>>interested
>>>>> in the details.
>>>>> 
>>>> 
>>>> Thanks for sharing Matt! That's an excellent write up.
>>>> 
>>>> --
>>>> -jlk
>>>> 
>>>> _______________________________________________
>>>> OpenStack-operators mailing list
>>>> OpenStack-operators at lists.openstack.org
>>>> 
>>>>http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-operators
>>> 
>>> _______________________________________________
>>> OpenStack-operators mailing list
>>> OpenStack-operators at lists.openstack.org
>>> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-operators
>> _______________________________________________
>> OpenStack-operators mailing list
>> OpenStack-operators at lists.openstack.org
>> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-operators
>