Hi list,
I just followed the placement group guide to set pg_num for the rbd pool.
"
Less than 5 OSDs set pg_num to 128
Between 5 and 10 OSDs set pg_num to 512
Between 10 and 50 OSDs set pg_num to 4096
If you have more than 50 OSDs, you need to understand the tradeoffs and how to
calculate the pg_num value by yourself
For calculating pg_num value by yourself please take help of pgcalc tool
"
Since I have 40 OSDs, so I set pg_num to 4096 according to the above
recommendation.
However, after configured pg_num and pgp_num both to 4096, I found that my
ceph cluster in **HEALTH_WARN** status, which does surprised me and still
confusing me.
> cluster bf6fa9e4-56db-481e-8585-29f0c8317773
health HEALTH_WARN
too many PGs per OSD (307 > max 300)
I see the cluster also says "4096 active+clean" so it's safe, but I do not like
the HEALTH_WARN in anyway.
As I know(from ceph -s output), the recommended pg_num per OSD is [30, 300], any
other pg_num out of this range with bring cluster to HEALTH_WARN.
So what I would like to say: is the document misleading? Should we fix it?
--
Thanks,
Chengwei
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