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To: Proxmox VE development discussion <pve-devel@lists.proxmox.com>,
 Alexandre DERUMIER <aderumier@odiso.com>
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From: Thomas Lamprecht <t.lamprecht@proxmox.com>
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Subject: Re: [pve-devel] corosync bug: cluster break after 1 node clean
 shutdown
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On 10.09.20 13:34, Alexandre DERUMIER wrote:
>>> as said, if the other nodes where not using HA, the watchdog-mux had =
no
>>> client which could expire.
>=20
> sorry, maybe I have wrong explained it,
> but all my nodes had HA enabled.
>=20
> I have double check lrm_status json files from my morning backup 2h bef=
ore the problem,
> they were all in "active" state. ("state":"active","mode":"active" )
>=20

OK, so all had a connection to the watchdog-mux open. This shifts the sus=
picion
again over to pmxcfs and/or corosync.

> I don't why node7 don't have rebooted, the only difference is that is w=
as the crm master.
> (I think crm also reset the watchdog counter ? maybe behaviour is diffe=
rent than lrm ?)

The watchdog-mux stops updating the real watchdog as soon any client disc=
onnects or times
out. It does not know which client (daemon) that was.

>>> above lines also indicate very high load.=20
>>> Do you have some monitoring which shows the CPU/IO load before/during=
 this event?=20
>=20
> load (1,5,15 ) was: 6  (for 48cores), cpu usage: 23%
> no iowait on disk (vms are on a remote ceph, only proxmox services are =
running on local ssd disk)
>=20
> so nothing strange here :/

Hmm, the long loop times could then be the effect of a pmxcfs read or wri=
te
operation being (temporarily) stuck.