Thanks Jane! I will go with 2048 PG. Thanks, Gagan On Thu, May 1, 2025 at 12:49 PM Janne Johansson <icepic.dz@gmail.com> wrote:
Den tors 1 maj 2025 kl 09:12 skrev gagan tiwari <gagan.tiwari@mathisys-india.com>:
HI Janne, Thanks for the explanation.
So, using all 10X15 Disks on 7 OSD nodes. Number PG will be :-
( 10X7X100 ) / 6 = 1166.666 nearest power of 2 is 2028.
So, I will need to set 2028 placement groups. With 2028 PG , three will
be 12,168 pieces to be spread out on 70
OSDs, which will give me 173.82 per OSD. Will this be an optimal number ? Or this should be rounded off to 174
You could still start with 1024, it will not hurt a lot to have 80 PGs per OSD and you can split again later (which one does after expanding clusters anyhow) but then again, with ssd/nvme, being closer to 200 PGs per OSD is probably better to utilize the flash drives better. Go with 2048.
-- May the most significant bit of your life be positive.