Unfortunately, my e-mail client does not collect threads properly.
Think I got my answer.
Form Janne Johansson:
Since using computer time and date is fraught with
peril, having the whole
cluster just bump that single number every second (and writing it to the PG
on each write) would allow a mostly idle PG that comes back after an hour
of unexpected downtime to easily know if it needs no recovery, a little bit
of delta to get up-to-date or a full copy from the primary in order to
become a part of the replica set for that PG.
So an increase every second is expected.
Thanks and best regards,
=================
Frank Schilder
AIT Risø Campus
Bygning 109, rum S14
________________________________________
From: Frank Schilder <frans(a)dtu.dk>
Sent: 14 May 2020 12:37
To: Nghia Viet Tran; Bryan Henderson; Ceph users mailing list
Subject: [ceph-users] Re: What is a pgmap?
Hi, I also observe an increase in pgmap version every second or so, see snippet below. I
run mimic 13.2.8 without any PG scaling/upmapping. Why does the version increase so
often?
May 14 12:33:50 ceph-03 journal: cluster 2020-05-14 12:33:48.521546 mgr.ceph-02
mgr.27460080 192.168.32.66:0/63 114833 : cluster [DBG] pgmap v114860: 2545 pgs: 2
active+clean+scrubbing+deep, 2543 active+clean; 195 TiB data, 249 TiB used, 1.5 PiB / 1.8
PiB avail; 4.8 MiB/s rd, 11 MiB/s wr, 1.48 kop/s
May 14 12:33:50 ceph-02 journal: 2020-05-14 12:33:50.543 7fdb57c5b700 0
log_channel(cluster) log [DBG] : pgmap v114861: 2545 pgs: 2 active+clean+scrubbing+deep,
2543 active+clean; 195 TiB data, 249 TiB used, 1.5 PiB / 1.8 PiB avail; 5.6 MiB/s rd, 11
MiB/s wr, 1.21 kop/s
May 14 12:33:52 ceph-02 journal: 2020-05-14 12:33:52.565 7fdb57c5b700 0
log_channel(cluster) log [DBG] : pgmap v114862: 2545 pgs: 2 active+clean+scrubbing+deep,
2543 active+clean; 195 TiB data, 249 TiB used, 1.5 PiB / 1.8 PiB avail; 8.9 MiB/s rd, 16
MiB/s wr, 1.59 kop/s
The version increases every second, here from pgmap v114860 to pgmap v114862. Current
cluster status:
[root@gnosis]# ceph status
cluster:
id: ---
health: HEALTH_OK
services:
mon: 3 daemons, quorum ceph-01,ceph-02,ceph-03
mgr: ceph-02(active), standbys: ceph-01, ceph-03
mds: con-fs2-1/1/1 up {0=ceph-08=up:active}, 1 up:standby-replay
osd: 288 osds: 268 up, 268 in
data:
pools: 10 pools, 2545 pgs
objects: 80.80 M objects, 195 TiB
usage: 249 TiB used, 1.5 PiB / 1.8 PiB avail
pgs: 2543 active+clean
2 active+clean+scrubbing+deep
io:
client: 20 MiB/s rd, 21 MiB/s wr, 578 op/s rd, 1.08 kop/s wr
Thanks for any info!
=================
Frank Schilder
AIT Risø Campus
Bygning 109, rum S14
________________________________________
From: Nghia Viet Tran <Nghia.Viet.Tran(a)mgm-tp.com>
Sent: 14 May 2020 03:49:38
To: Bryan Henderson; Ceph users mailing list
Subject: [ceph-users] Re: What is a pgmap?
If your Ceph cluster are running on the latest version of Ceph then the the pg_autoscaler
probably is the reason. After the period of time, Ceph will check the cluster status and
increase/decrease the number of PG in the cluster if needed.
On 5/14/20, 03:37, "Bryan Henderson" <bryanh(a)giraffe-data.com> wrote:
I'm surprised I couldn't find this explained anywhere (I did look), but ...
What is the pgmap and why does it get updated every few seconds on a tiny
cluster that's mostly idle?
I do know what a placement group (PG) is and that when documentation talks
about placement group maps, it is talking about something else -- mapping of
PGs to OSDs by CRUSH and OSD maps.
--
Bryan Henderson San Jose, California
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