Re: ceph mgr balancer bad distribution

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Hi,

Am 02.03.2018 um 21:21 schrieb Stefan Priebe - Profihost AG:
> Hi,
> 
> Am 02.03.2018 um 14:29 schrieb Dan van der Ster:
>> On Fri, Mar 2, 2018 at 10:12 AM, Stefan Priebe - Profihost AG
>> <s.priebe@xxxxxxxxxxxx> wrote:
>>> Thanks! Your patch works great!
>>
>> Cool! I plan to add one more feature to allow operators to switch off
>> components of the score function. Currently, by only changing the key
>> to 'bytes', we aren't able to fully balance things because at some
>> point the pgs score gets too suboptimal and the overall score reaches
>> a min value.
> 
> OK great but it still works perfectly for my clusters. 2%-3% difference
> for all OSDs.

ok i had another cluster - where this seems to happen. It just says
Failed to find further optimization but the bytes difference is 12%.

>>> The only problem I still see is that the
>>> balancer kicks in even when the old optimize has not finished. It seems it
>>> only evaluated the degraded of value. But while remapping it can happen that
>>> none are degraded but a lot are still misplaced.
>>>
>>> I think the balancer should evaluate the ceph health status as well.
>>
>> I guess this point is debatable. On our clusters we use max_misplaced
>> = 0.01 and set the begin_hour end_hour to daytime hours so that by the
>> late evening, every day, the cluster is back to HEALTH_OK.
> 
> ah OK. Is it true that the begin_time and end_time is GMT and not local
> time? Can we change this as it makes configuration of monitoring systems
> impossible - time changes also with summer and winter time.

Sorry at least in my case this works fine.

> 
> Greets,
> Stefan
> 
>> Cheers, Dan
>>
>>> Stefan
>>>
>>> Excuse my typo sent from my mobile phone.
>>>
>>> Am 01.03.2018 um 13:12 schrieb Dan van der Ster <dan@xxxxxxxxxxxxxx>:
>>>
>>> On Thu, Mar 1, 2018 at 1:08 PM, Stefan Priebe - Profihost AG
>>> <s.priebe@xxxxxxxxxxxx> wrote:
>>>
>>> nice thanks will try that soon.
>>>
>>>
>>> Can you tell me how to change the log lever to info for the balancer module?
>>>
>>>
>>> debug mgr = 4/5
>>>
>>> -- dan
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