Hi,
On 02/04/2016 03:17 PM, Kyle Harris
wrote:
I have been working on a very basic cluster with 3
nodes and a single OSD per node. I am using Hammer
installed on CentOS 7 (ceph-0.94.5-0.el7.x86_64) since it
is the LTS version. I kept running into an issue of not
getting past the status of undersized+degraded+peered. I
finally discovered the problem was that in the default
CRUSH map, the weight assigned is 0. I changed the weight
and everything came up as it should. I did the same test
using the Infernalis release and everything worked as
expected as the weight has been changed to a default of
321.
- Is this a bug or by design and if the latter, why?
Perhaps I'm missing something?
- Has anyone else ran into this?
- Am I correct in assuming a weight of 0 won't allow
the OSDs to be used or is there some other purpose for
this?
The default weight is the size of the OSD in tera bytes. Did you use
a very small OSD partition for test purposes, e.g. 20 GB? In that
case the weight is rounded and results in an effective weight of
0.0. As a result the OSD will not be used for data storage.
Regards,
Burkhard
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