Re: ceph pg/pgp number calculation

[David Turner <drakonstein@xxxxxxxxx>]

Not all pools need the same amount of PGs. When you get to so many pools you want to start calculating how much data each pool will have. If 1 of your pools will have 80% of your data in it, it should have 80% of your PGs. The metadata pools for rgw likely won't need more than 8 or so PGs each. If your rgw data pool is only going to have a little scratch data, then it won't need very many PGs either.

On Tue, Oct 16, 2018, 3:35 AM Zhenshi Zhou <deaderzzs@xxxxxxxxx> wrote:

Hi,

I have a cluster serving rbd and cephfs storage for a period of 

time. I added rgw in the cluster yesterday and wanted it to server 

object storage. Everything seems good. 

What I'm confused is how to calculate the pg/pgp number. As we

all know, the formula of calculating pgs is:

Total PGs = ((Total_number_of_OSD * 100) / max_replication_count) / pool_count

Before I created rgw, the cluster had 3 pools(rbd, cephfs_data, cephfs_meta).

But now it has 8 pools, which object service may use, including '.rgw.root', 

'default.rgw.control', 'default.rgw.meta', 'default.rgw.log' and 'defualt.rgw.buckets.index'.

Should I calculate pg number again using new pool number as 8, or should I 

continue to use the old pg number?

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