I guess my questions are more centered around k+m and PG calculations.
As we were starting to build and test our EC pools with our infrastructure we were trying to figure out what our calculations needed to be starting with 3 OSD hosts with 12 x 10 TB OSDs a piece. The nodes have the ability to expand to 24 drives a piece and we hope to eventually get to around a 1PB cluster after we add some more hosts. Initially we hoped to be able to do a k=10 m=2 on the pool but I am not sure that is going to be feasible. We’d like to set up the failure domain so that we would be able to lose an entire host without losing the cluster. At this point I’m not sure that’s possible without bringing in more hosts.
Thanks for the help!
Tim Gipson
On 11/12/17, 5:14 PM, "Christian Wuerdig" <christian.wuerdig@xxxxxxxxx> wrote:
I might be wrong, but from memory I think you can use
http://ceph.com/pgcalc/ and use k+m for the size
On Sun, Nov 12, 2017 at 5:41 AM, Ashley Merrick <ashley@xxxxxxxxxxxxxx> wrote:
> Hello,
>
> Are you having any issues with getting the pool working or just around the
> PG num you should use?
>
> ,Ashley
>
> Get Outlook for Android
>
> ________________________________
> From: ceph-users <ceph-users-bounces@xxxxxxxxxxxxxx> on behalf of Tim Gipson
> <tgipson@xxxxxxx>
> Sent: Saturday, November 11, 2017 5:38:02 AM
> To: ceph-users@xxxxxxxxxxxxxx
> Subject: Erasure Coding Pools and PG calculation -
> documentation
>
> Hey all,
>
> I’m having some trouble setting up a Pool for Erasure Coding. I haven’t
> found much documentation around the PG calculation for an Erasure Coding
> pool. It seems from what I’ve tried so far that the math needed to set one
> up is different than the math you use to calculate PGs for a regular
> replicated pool.
>
> Does anyone have any experience setting up a pool this way and can you give
> me some help or direction, or point me toward some documentation that goes
> over the math behind this sort of pool setup?
>
> Any help would be greatly appreciated!
>
> Thanks,
>
>
> Tim Gipson
> Systems Engineer
>
>
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