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Hi Ahsley, The rule you indicated, with “step choose indep 0 type osd” should select 13 different OSDs but not necessary on 13 different servers. So you should be able to test that on say 4 servers if you have ~4 OSDs per server. To split the selected OSDs across 4 hosts, I think you would do something like: “step take fourtb step choose indep 4 type host step choose indep 4 type osd step emit” Cheers, Maxime From: ceph-users <ceph-users-bounces@xxxxxxxxxxxxxx> on behalf of Ashley Merrick <ashley@xxxxxxxxxxxxxx> Hello, I am currently doing some erasure code tests in a dev environment. I have set the following by “default” rule sas { ruleset 2 type erasure min_size 3 max_size 13 step set_chooseleaf_tries 5 step set_choose_tries 100 step take fourtb step choose indep 0 type osd step emit } As I am splitting the file into 13 chunks it is placing these across 13 different OSD’s. In the DEV environment I do not have 13 hosts to do full host replication, however I am sure I can change the crush map rule to try and split evenly across the 4 HOST I have. I’m think I will need to tell it to pick 4 HOST’s, and then the second line to pick OSD’s, however as 13 does not divide by 4 exactly what would be the best way to lay out this crushmap rule?
Thanks, Ashley |
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