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Hash: SHA256
Thanks
- ----------------
Robert LeBlanc
PGP Fingerprint 79A2 9CA4 6CC4 45DD A904 C70E E654 3BB2 FA62 B9F1
On Thu, Oct 15, 2015 at 5:38 PM, JC Lopez wrote:
> Hi Robert
>
> usable bytes so before replication. The size of the actual original objects you write.
>
> Cheers
> JC
>
>> On 15 Oct 2015, at 16:33, Robert LeBlanc wrote:
>>
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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
>>>>>>
>>>>>> -----BEGIN PGP SIGNED MESSAGE-----
>>>>>> Hash: SHA256
>>>>>>
>>>>>> 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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>
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