Re: [ceph-users] erasure coded pool why ever k1?

2015-01-22 Thread Loic Dachary
Hi, On 22/01/2015 16:37, Chad William Seys wrote: Hi Loic, The size of each chunk is object size / K. If you have K=1 and M=2 it will be the same as 3 replicas with none of the advantages ;-) Interesting! I did not see this explained so explicitly. So is the general explanation of k

Re: [ceph-users] erasure coded pool why ever k1?

2015-01-22 Thread Chad William Seys
Hi Loic, The size of each chunk is object size / K. If you have K=1 and M=2 it will be the same as 3 replicas with none of the advantages ;-) Interesting! I did not see this explained so explicitly. So is the general explanation of k and m something like: k, m: fault tolerance of m+1

[ceph-users] erasure coded pool why ever k1?

2015-01-21 Thread Chad William Seys
Hello all, What reasons would one want k1? I read that m determines the number of OSD which can fail before loss. But I don't see explained how to choose k. Any benefits for choosing k1? Thanks! Chad. ___ ceph-users mailing list

Re: [ceph-users] erasure coded pool why ever k1?

2015-01-21 Thread Loic Dachary
On 21/01/2015 22:42, Chad William Seys wrote: Hello all, What reasons would one want k1? I read that m determines the number of OSD which can fail before loss. But I don't see explained how to choose k. Any benefits for choosing k1? The size of each chunk is object size / K. If you

Re: [ceph-users] erasure coded pool why ever k1?

2015-01-21 Thread Don Doerner
Of Loic Dachary Sent: 21 January, 2015 15:18 To: Chad William Seys; ceph-users@lists.ceph.com Subject: Re: [ceph-users] erasure coded pool why ever k1? On 21/01/2015 22:42, Chad William Seys wrote: Hello all, What reasons would one want k1? I read that m determines the number of OSD which