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One more question. Is max_{bytes,objects} before or after replication factor?
- ----------------
Robert LeBlanc
PGP Fingerprint 79A2 9CA4 6CC4 45DD A904 C70E E654 3BB2 FA62 B9F1
On Thu, Oct 15, 2015 at 4:42 PM, LOPEZ Jean-Charles wrote:
> Hi Robert,
>
> yes they do.
>
> Pools don’t have a size when you create them hence the couple value/ratio that is to be defined for cache tiering mechanism. Pool only have a number of PGs assigned. So setting the max values and the ratios for dirty and full must be set explicitly to match your configuration.
>
> Note that you can at the same time define max_bytes and max_objects. The first of the 2 values that breaches using your ratio settings will trigger eviction and/or flushing. The ratios you choose apply to both values.
>
> Cheers
> JC
>
>> On 15 Oct 2015, at 15:02, Robert LeBlanc wrote:
>>
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>> hmmm...
>>
>> http://docs.ceph.com/docs/master/rados/operations/cache-tiering/#relative-sizing
>>
>> makes it sound like it should be based on the size of the pool and
>> that you don't have to set anything like max bytes/objects. Can you
>> confirm that cache_target_{dirty,dirty_high,full}_ratio works as a
>> ratio of target_max_bytes set?
>> - ----------------
>> Robert LeBlanc
>> PGP Fingerprint 79A2 9CA4 6CC4 45DD A904 C70E E654 3BB2 FA62 B9F1
>>
>>
>> On Thu, Oct 15, 2015 at 3:32 PM, Nick Fisk wrote:
>>>
>>>
>>>
>>>
>>>> -----Original Message-----
>>>> From: ceph-users [mailto:ceph-users-bounces@xxxxxxxxxxxxxx] On Behalf Of
>>>> Robert LeBlanc
>>>> Sent: 15 October 2015 22:06
>>>> To: ceph-users@xxxxxxxxxxxxxx
>>>> Subject: Cache Tiering Question
>>>>
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>>>> ceph df (ceph version 0.94.3-252-g629b631
>>>> (629b631488f044150422371ac77dfc005f3de1bc)) is showing some odd
>>>> results:
>>>>
>>>> root@nodez:~# ceph df
>>>> GLOBAL:
>>>> SIZE AVAIL RAW USED %RAW USED
>>>> 24518G 21670G 1602G 6.53
>>>> POOLS:
>>>> NAME ID USED %USED MAX AVAIL OBJECTS
>>>> rbd 0 2723G 11.11 6380G 1115793
>>>> ssd-pool 2 0 0 732G 1
>>>>
>>>> The rbd pool is showing 11.11% used, but if you calculate the numbers
>>> there
>>>> it is 2723/6380=42.68%.
>>>
>>> I have a feeling that the percentage is based on the amount used of the
>>> total cluster size. Ie 2723/24518
>>>
>>>>
>>>> Will this cause problems with the relative cache tier settings? Do I need
>>> to set
>>>> the percentage based on what Ceph is reporting here?
>>>
>>> The flushing/eviction thresholds are based on the target_max_bytes number
>>> that you set, they have nothing to do with the underlying pool size. It's up
>>> to you to come up with a sane number for this variable.
>>>
>>>>
>>>> Thanks,
>>>> - ----------------
>>>> Robert LeBlanc
>>>> PGP Fingerprint 79A2 9CA4 6CC4 45DD A904 C70E E654 3BB2 FA62 B9F1 -----
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>>>
>>>
>>>
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