> On Jan 14, 2025, at 10:51 AM, Nicola Mori <mori@xxxxxxxxxx> wrote:
>
> Dear Anthony,
>
> the autoscaler has finished its work, no OOM disaster happened
:D
> , and the current situation is:
>
> # ceph osd pool autoscale-status
> POOL SIZE TARGET SIZE RATE RAW CAPACITY RATIO TARGET RATIO EFFECTIVE RATIO BIAS PG_NUM NEW PG_NUM AUTOSCALE BULK
> .mgr 248.4M 3.0 323.8T 0.0000 1.0 1 on False
> wizard_metadata 1171M 3.0 323.8T 0.0000 4.0 16 16384 on True
> wizard_data 79648G 1.3333333730697632 323.8T 0.3203 1.0 2048 on True
> The min and max OSD occupancy are now much more similar: 30.34% and 33.66%, which seems reasonable if I correctly understand.
Yes, absolutely. You could squeeze that tighter if you try hard enough, but IMHO you’re probably fine where you are.
> The available space of the filesystem however is at 227 TiB which is just 70% of the 324 TiB raw space. It is quite improved but still far from the theoretical maximum of 75% for my 6+2 EC data pool. Neglecting the .mgr and metadata pools, I'd really like to recover the missing 5% which is 16 TB (i.e. about half host), is there something more that can be attempted?
Those calculations are a bit subtle, I fear that I have no additional wisdom on a Monday for that gap.
>
> One more question: on the web UI keep receiving notifications like "PG autoscaler increasing pool 2 PGs from 16 to 16384", once per minute, but no change in PG number is actually happening. From the autoscale-status output posted above I see that for the metadata pool the value for NEW PG_NUM is 16384, but I don't understand what it means.
Use the source, Luke ;)
def update(self, module: MgrModule, progress: float) -> None:
desc = 'increasing' if self.pg_num < self.pg_num_target else 'decreasing'
module.remote('progress', 'update', self.ev_id,
ev_msg="PG autoscaler %s pool %d PGs from %d to %d" %
(desc, self.pool_id, self.pg_num, self.pg_num_target),
ev_progress=progress,
refs=[("pool", self.pool_id)])
I think NEW PG_NUM is the target and PG_NUM is the current value, though I wouldn’t expect the metadata pool to want to be that large. I would expect PG_NUM to be increasing. What does `ceph osd dump | grep pool` show for pg_num and pgp_num?
>
> Thank you,
>
> Nicola
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