On Wed, Jun 29, 2022 at 4:42 PM Stefan Kooman <stefan@xxxxxx> wrote:
> On 6/29/22 11:21, Curt wrote:
> > On Wed, Jun 29, 2022 at 1:06 PM Frank Schilder <frans@xxxxxx> wrote:
> >
> >> Hi,
> >>
> >> did you wait for PG creation and peering to finish after setting pg_num
> >> and pgp_num? They should be right on the value you set and not lower.
> >>
> > Yes, only thing going on was backfill. It's still just slowly expanding
> pg
> > and pgp nums. I even ran the set command again. Here's the current
> info
> > ceph osd pool get EC-22-Pool all
> > size: 4
> > min_size: 3
> > pg_num: 226
> > pgp_num: 98
>
> This is coded in the mons and works like that from nautilus onwards:
>
> src/mon/OSDMonitor.cc
>
> ...
> if (osdmap.require_osd_release < ceph_release_t::nautilus) {
> // pre-nautilus osdmap format; increase pg_num directly
> assert(n > (int)p.get_pg_num());
> // force pre-nautilus clients to resend their ops, since they
> // don't understand pg_num_target changes form a new interval
> p.last_force_op_resend_prenautilus = pending_inc.epoch;
> // force pre-luminous clients to resend their ops, since they
> // don't understand that split PGs now form a new interval.
> p.last_force_op_resend_preluminous = pending_inc.epoch;
> p.set_pg_num(n);
> } else {
> // set targets; mgr will adjust pg_num_actual and pgp_num later.
> // make pgp_num track pg_num if it already matches. if it is set
> // differently, leave it different and let the user control it
> // manually.
> if (p.get_pg_num_target() == p.get_pgp_num_target()) {
> p.set_pgp_num_target(n);
> }
> p.set_pg_num_target(n);
> }
> ...
>
> So, when pg_num and pgp_num are the same when pg_num is increased, it
> will slowly change pgp_num. If pgp_num is different (smaller, as it
> cannot be bigger than pg_num) it will not touch pgp_num.
>
> You might speed up this process by increasing "target_max_misplaced_ratio"
>
> Gr. Stefan
>
Hi Stefan,
Good to know. I see the default if .05 for misplaced_ratio. What do you
recommend would be a safe number to increase it to?
Thanks,
Curt
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