Hi all,

I deleted a ceph fs data pool (EC 8+2) of size 240TB with about 150M objects and it had no observable impact at all. Client IO and admin operations worked just like before. In fact, I was surprised how fast it went and how fast the capacity became available again. It was probably just a few days, but don't remember the exact times any more.

My version back then was mimic 13.2.8. All OSDs had collocated WAL/DB, everything on spindle. My impression from reports in this list is, that this started becoming a problem with changes made in nautilus.

Best regards,
=================
Frank Schilder
AIT Risø Campus
Bygning 109, rum S14

________________________________________
From: Glen Baars <glen@onsitecomputers.com.au>
Sent: 09 January 2021 08:15:51
To: Scheurer François; ceph-users@ceph.io
Subject: [ceph-users] Re: performance impact by pool deletion?

I deleted a 240TB rgw pool a few weeks ago, caused a huge slowdown. Lucky it wasn't a important cluster otherwise it would've taken it down for a week.

From: Scheurer François <francois.scheurer@everyware.ch>
Sent: Wednesday, 6 January 2021 11:32 PM
To: ceph-users@ceph.io
Subject: [ceph-users] performance impact by pool deletion?


Hi everybody





Does somebody had experience with important performance degradations during

a pool deletion?



We are asking because we are going to delete a 370 TiB with 120 M objects and have never done this in the past.

The pool is using erasure coding 8+2 on nvme ssd's with rocksdb/wal on nvme optane disks.

Openstack VM's are running on the other rbd pools.



Thank you in advance for your feedback!



Cheers

Francois



PS:

this is no option, as it take about 100 year to complete ;-) :
rados -p ch-zh1-az1.rgw.buckets.data ls | while read i; do rados -p ch-zh1-az1.rgw.buckets.data rm "$i"; done






--


EveryWare AG
François Scheurer
Senior Systems Engineer
Zurlindenstrasse 52a
CH-8003 Zürich

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