erasure coded pool k=7,m=5

[Stéphane DUGRAVOT <stephane.dugravot@xxxxxxxxxxxxxxxx>]

Hi all,

Soon, we should have a 3 datacenters (dc) ceph cluster with 4 hosts in each dc. Each host will have 12 OSD.

We can accept the loss of one datacenter and one host on the remaining 2 datacenters.

In order to use erasure coded pool :

1. Is the solution for a strategy k = 7, m = 5 is acceptable ?
2. Is this is the only one that guarantees us our premise ?
3. And more generally, is there a formula (based on the number of dc, host and OSD) that allows us to calculate the profile ?

Thanks.

Stephane.

-- 

Université de Lorraine
Stéphane DUGRAVOT - Direction du numérique - Infrastructure
Jabber : stephane.dugravot@xxxxxxxxxxxxxxxx

Tél.: +33 3 83 68 20 98

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