Hi Jan,
Thanks for the reply. I see your point about replicas. However my
motivation was a bit different.
Consider some given amount of objects that are stored in the metadata
pool.
If I understood correctly ceph data placement approach, the number of
objects per PG should decrease with the amount of PGs per pool.
So my concern is that in catastrophic event of some PG(s) being lost I
will loose more objects if the amount of PGs per pool is small. At the
same time I don't want to have too few objects per PG to keep things
disk IO, but not CPU bounded.
So I thought maybe somebody did some research in this direction?
On Wed, Dec 9, 2015 at 1:13 PM, Jan Schermer <[email protected]> wrote:
Number of PGs doesn't affect the number of replicas, so don't worry
about it.
Jan
On 09 Dec 2015, at 13:03, Mykola Dvornik <[email protected]>
wrote:
Hi guys,
I am creating a 4-node/16OSD/32TB CephFS from scratch.
According to the ceph documentation the metadata pool should have
small amount of PGs since it contains some negligible amount of data
compared to data pool. This makes me feel it might not be safe.
So I was wondering how to chose the number of PGs per metadata pool
to maintain its performance and reliability?
Regards,
Mykola
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