Re: pg count question

[Satish Patel <satish.txt@xxxxxxxxx>]

Thanks,

Can you explain about %Data field in that calculation, is this total data usage for specific pool or total ?

For example 

Pool-1 is small so should I use 20% 

Pool-2 is bigger so I should use 80% 

I'm confused there so can you give me just example how to calculate that field?

Sent from my iPhone

On Aug 9, 2018, at 4:25 PM, Subhachandra Chandra <schandra@xxxxxxxxxxxx> wrote:

I have used the calculator at https://ceph.com/pgcalc/ which looks at relative sizes of pools and makes a suggestion.

Subhachandra

On Thu, Aug 9, 2018 at 1:11 PM, Satish Patel <satish.txt@xxxxxxxxx> wrote:

Thanks Subhachandra,

That is good point but how do i calculate that PG based on size?

On Thu, Aug 9, 2018 at 1:42 PM, Subhachandra Chandra
<schandra@xxxxxxxxxxxx> wrote:
> If pool1 is going to be much smaller than pool2, you may want more PGs in
> pool2 for better distribution of data.
>
>
>
>
> On Wed, Aug 8, 2018 at 12:40 AM, Sébastien VIGNERON
> <sebastien.vigneron@xxxxxxxxx> wrote:
>>
>> The formula seems correct for a 100 pg/OSD target.
>>
>>
>> > Le 8 août 2018 à 04:21, Satish Patel <satish.txt@xxxxxxxxx> a écrit :
>> >
>> > Thanks!
>> >
>> > Do you have any comments on Question: 1 ?
>> >
>> > On Tue, Aug 7, 2018 at 10:59 AM, Sébastien VIGNERON
>> > <sebastien.vigneron@xxxxxxxxx> wrote:
>> >> Question 2:
>> >>
>> >> ceph osd pool set-quota <poolname> max_objects|max_bytes <val>
>> >> set object or byte limit on pool
>> >>
>> >>
>> >>> Le 7 août 2018 à 16:50, Satish Patel <satish.txt@xxxxxxxxx> a écrit :
>> >>>
>> >>> Folks,
>> >>>
>> >>> I am little confused so just need clarification, I have 14 osd in my
>> >>> cluster and i want to create two pool  (pool-1 & pool-2) how do i
>> >>> device pg between two pool with replication 3
>> >>>
>> >>> Question: 1
>> >>>
>> >>> Is this correct formula?
>> >>>
>> >>> 14 * 100 / 3 / 2 =  233  ( power of 2 would be 256)
>> >>>
>> >>> So should i give 256 PG per pool right?
>> >>>
>> >>> pool-1 = 256 pg & pgp
>> >>> poo-2 = 256 pg & pgp
>> >>>
>> >>>
>> >>> Question: 2
>> >>>
>> >>> How do i set limit on pool for example if i want pool-1 can only use
>> >>> 500GB and pool-2 can use rest of the space?
>> >>> _______________________________________________
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>> >>
>>
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>
>

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