Thank you for your reply.
As far as I understand it can tolerate failure of 3 OSDs and 1 host, am I right ?
I am finding it confusing to understand the profile structure.
Consider a cluster of 8 OSD servers with 3 disks on each server.
If I use a profile setting of k=5, m=3 and ruleset-failure-domain=host ;
Encoding Rate (r) : r = k / n , where n = k+m = 5/8 = 0.625
Storage Required : 1 / r = 1 / 0.625 = 1.6 times original file
Is this correct? And more importantly, will the profile work without failure?
As far as I understand it can tolerate failure of 3 OSDs and 1 host, am I right ?
I can't find much information from this link :
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Is there a better article that I can refer to ?
Karun Josy
On Tue, Oct 24, 2017 at 1:23 AM, David Turner <drakonstein@xxxxxxxxx> wrote:
This can be changed to a failure domain of OSD in which case it could satisfy the criteria. The problem with a failure domain of OSD, is that all of your data could reside on a single host and you could lose access to your data after restarting a single host.On Mon, Oct 23, 2017 at 3:23 PM LOPEZ Jean-Charles <jelopez@xxxxxxxxxx> wrote:Hi,the default failure domain if not specified on the CLI at the moment you create your EC profile is set to HOST. So you need 14 OSDs spread across 14 different nodes by default. And you only have 8 different nodes.RegardsJC______________________________On 23 Oct 2017, at 21:13, Karun Josy <karunjosy1@xxxxxxxxx> wrote:Thank you for the reply.There are 8 OSD nodes with 23 OSDs in total. (However, they are not distributed equally on all nodes)
So it satisfies that criteria, right?Karun JosyOn Tue, Oct 24, 2017 at 12:30 AM, LOPEZ Jean-Charles <jelopez@xxxxxxxxxx> wrote:Hi,yes you need as many OSDs that k+m is equal to. In your example you need a minimum of 14 OSDs for each PG to become active+clean.RegardsJCOn 23 Oct 2017, at 20:29, Karun Josy <karunjosy1@xxxxxxxxx> wrote:______________________________Hi,While creating a pool with erasure code profile k=10, m=4, I get PG status as"200 creating+incomplete"While creating pool with profile k=5, m=3 it works fine.Cluster has 8 OSDs with total 23 disks.Is there any requirements for setting the first profile ?Karun_________________
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