Re: PG num calculator live on Ceph.com

["Sanders, Bill" <Bill.Sanders@xxxxxxxxxxxx>]

This is interesting.  Kudos to you guys for getting the calculator up, I think this'll help some folks.

I have 1 pool, 40 OSDs, and replica of 3.  I based my PG count on: http://ceph.com/docs/master/rados/operations/placement-groups/

'''
Less than 5 OSDs set pg_num to 128
Between 5 and 10 OSDs set pg_num to 512
Between 10 and 50 OSDs set pg_num to 4096
'''

But the calculator gives a different result of 2048.  Out of curiosity, what sorts of issues might one encounter by having too many placement groups?  I understand there's some resource overhead.  I don't suppose it would manifest itself in a recognizable way?

Bill

---

From: ceph-users [ceph-users-bounces@xxxxxxxxxxxxxx] on behalf of Michael J. Kidd [michael.kidd@xxxxxxxxxxx]
Sent: Wednesday, January 07, 2015 3:51 PM
To: Loic Dachary
Cc: ceph-users@xxxxxxxx
Subject: Re: PG num calculator live on Ceph.com

> Where is the source ?

On the page.. :)  It does link out to jquery and jquery-ui, but all the custom bits are embedded in the HTML.

Glad it's helpful :)

Michael J. Kidd
Sr. Storage Consultant
Inktank Professional Services

 - by Red Hat

On Wed, Jan 7, 2015 at 3:46 PM, Loic Dachary <loic@xxxxxxxxxxx> wrote:

On 07/01/2015 23:08, Michael J. Kidd wrote:
> Hello all,
>   Just a quick heads up that we now have a PG calculator to help determine the proper PG per pool numbers to achieve a target PG per OSD ratio.
>
> http://ceph.com/pgcalc
>
> Please check it out!  Happy to answer any questions, and always welcome any feedback on the tool / verbiage, etc...

Great work ! That will be immensely useful :-)

Where is the source ?

Cheers

>
> As an aside, we're also working to update the documentation to reflect the best practices.  See Ceph.com tracker for this at:
> http://tracker.ceph.com/issues/9867
>
> Thanks!
> Michael J. Kidd
> Sr. Storage Consultant
> Inktank Professional Services
>  - by Red Hat
>
>

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>

--
Loïc Dachary, Artisan Logiciel Libre

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