Open Stack

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
>> 
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