Re: [ceph-users] Changing pg_num on cache pool

I don't recall finding a definitive answer - though it was some time ago. IIRC, it did work but made the pool fragile; I remember having to rebuild the pools for my test rig soon after. Don't quite recall the root cause, though - could have been newbie operator error on my part. May have also

Re: [ceph-users] CoreOS Cluster of 7 machines and Ceph

Sorry for the late reply - been traveling. I'm doing exactly that right now, using the ceph-docker container. It's just in my test rack for now, but hardware arrived this week to seed the production version. I'm using separate containers for each daemon, including a container for each OSD. I've

Re: [ceph-users] Small cluster PG question

wondering about the pros and cons performance wise of having a > pool size of 3 vs 2. It seems there would be a benefit for reads (1.5 times > the bandwidth) but a penalty for writes because the primary has to forward > to 2 nodes instead of 1. Does that make sense? > > -Roland >

Re: [ceph-users] Small cluster PG question

Reads will be limited to 1/3 of the total bandwidth. A set of PGs has a "primary" - that's the first one (and only one, if it's up & in) consulted on a read. The other PGs will still exist, but they'll only take writes (and only after the primary PG forwards along data). If you have multiple

Re: [ceph-users] Status of ceph-docker

I'm preparing to use it in production, and have been contributing fixes for bugs I find. It's getting fairly solid, but it does need to be moved to Jewel before we really scale it out. -- Mike Shuey On Wed, May 4, 2016 at 8:50 AM, Daniel Gryniewicz wrote: > On 05/03/2016

[ceph-users] Changing pg_num on cache pool

I mistakenly created a cache pool with way too few PGs. It's attached as a write-back cache to an erasure-coded pool, has data in it, etc.; cluster's using Infernalis. Normally, I can increase pg_num live, but when I try in this case I get: # ceph osd pool set cephfs_data_cache pg_num 256