On 11/05/2012 06:14 AM, Stefan Priebe - Profihost AG wrote:
Hello list,
Is there a way to change the number of pg_num / pgp_num after adding
more osds?
The pg_num/pgp_num settings are only used by mkcephfs at install time.
I mean i would like to start with 16 OSDs but i think i'll expand over
time to up to 100 OSDs. So i think i need to tune pg_num / pgp_num.
You can specify pg_num when creating a pool:
ceph osd pool create <name> <pgnum>
But you don't want to have too many (thousands per osd). Being able
to change the number of pgs in a pool (pg splitting/merging) is in
the works, but in the mean time you can create more pools after you add
a bunch of osds to keep your pg/osd ratio around 100.
Josh
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