Re: [ceph-users] Erasure coding with more chunks than servers

2018-10-05 Thread Paul Emmerich
Oh, and you'll need to use m>=3 to ensure availability during a node failure. Paul Am Fr., 5. Okt. 2018 um 11:22 Uhr schrieb Caspar Smit : > > Hi Vlad, > > You can check this blog: > http://cephnotes.ksperis.com/blog/2017/01/27/erasure-code-on-small-clusters > > Note! Be aware that these setting

Re: [ceph-users] Erasure coding with more chunks than servers

2018-10-05 Thread Caspar Smit
Hi Vlad, You can check this blog: http://cephnotes.ksperis.com/blog/2017/01/27/erasure-code-on-small-clusters Note! Be aware that these settings do not automatically cover a node failure. Check out this thread why: http://lists.ceph.com/pipermail/ceph-users-ceph.com/2018-February/024423.html K

Re: [ceph-users] Erasure coding with more chunks than servers

2018-10-04 Thread Paul Emmerich
Yes, you can use a crush rule with two steps: take default chooseleaf indep 5 emit take default chooseleaf indep 2 emit You'll have to adjust it when adding a server, so it's not a great solution. I'm not sure if there's a way to do it without hardcoding the number of servers (I don't think there

[ceph-users] Erasure coding with more chunks than servers

2018-10-04 Thread Vladimir Brik
Hello I have a 5-server cluster and I am wondering if it's possible to create pool that uses k=5 m=2 erasure code. In my experiments, I ended up with pools whose pgs are stuck in creating+incomplete state even when I created the erasure code profile with --crush-failure-domain=osd. Assuming that