Hello,
I am trying to set up to measure erasure coding performance and overhead. My
Ceph "cluster-of-one" has 27 disks, hence 27 OSDs, all empty. I have ots of
memory, and I am using "osd crush chooseleaf type = 0" in my config file, so my
OSDs should be able to peer with others on the same host, right?
I look at the EC profiles defined, and see only "default" which has k=2,m=1.
Wanting to set up a more realistic test, I defined a new profile "k8m3",
similar to default, but with k=8,m=3.
Checked with "ceph osd erasure-code-profile get k8m3", all looks good.
I then go to define my pool: "ceph osd pool create ecpool 256 256 erasure k8m3"
apparently succeeds.
* Sidebar: my math on the pgnum stuff was (27 pools * 100)/11 = ~246,
round up to 256.
Now I ask "ceph health", and get:
HEALTH_WARN 256 pgs incomplete; 256 pgs stuck inactive; 256 pgs stuck unclean;
too few pgs per osd (9 < min 20)
Digging in to this a bit ("ceph health detail"), I see the magic OSD number
(2147483647) that says that there weren't enough OSDs to assign to a placement
group, for all placement groups. And at the same time, it is warning me that I
have too few PGs per OSD.
At the moment, I am defining a traditional replicated pool (3X) to see if that
will work... Anyone have any guess as to what I may be doing incorrectly with
my erasure coded pool? Or what I should do next to get a clue?
Regards,
-don-
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