New subject: Random hosts disconnects

Friday, 18 September 2020

Hi Anton,
I am not sure if changing this value would fix the issue. Defaults are
pretty high. For example vdsHeartbeatInSeconds=30seconds,
vdsTimeout=180seconds, vdsConnectionTimeout=20seconds.

Do you still have relevant logs from the affected hosts:
* /var/logs/vdsm/vdsm.log*
* /var/logs/vdsm/supervdsm.log*
Please look for any jsonrpc errors ie. write/read errors or (connection)
timeouts.  Storage related warnings/errors might also be relevant.

Plus system logs if possible:
*journalctl -f /usr/share/vdsm/vdsmd*
*journalctl  -f /usr/sbin/libvirtd*

In order to get system logs from particular time period please combine it
with the following example using -S  -U options:

*journalctl -S "2020-01-12 07:00:00" -U "2020-01-12 07:15:00"  *
I haven't a clue what to look there for besides any warnings/errors or
anything else that seems .... unusual.

Artur

On Thu, Sep 17, 2020 at 8:09 AM Anton Louw via Users <users(a)ovirt.org&gt;
wrote:

...

 Hi Everybody,

 Did some digging around, and saw a few things regarding “vdsHeartbeatInSeconds”

 I had a look at the properties file located at
/etc/ovirt-engine/engine-config/engine-config.properties, and do not see an entry for
“vdsHeartbeatInSeconds.type=Integer”.

 Seeing as these data centers are geographically split, could the “vdsHeartbeatInSeconds”
potentially be the issue? Is it safe to increase this value after I add
“vdsHeartbeatInSeconds.type=Integer” into my engine-config.properties file?

 Thanks

 *Anton Louw*
 *Cloud Engineer: Storage and Virtualization* at *Vox*
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 *From:* Anton Louw via Users <users(a)ovirt.org&gt;
 *Sent:* 16 September 2020 09:01
 *To:* users(a)ovirt.org
 *Subject:* [ovirt-users] Random hosts disconnects

 Hi All,

 I have a strange issue in my oVirt environment. I currently have a
 standalone manager which is running in VMware. In my oVirt environment, I
 have two Data Centers. The manager is currently sitting on the same subnet
 as DC1. Randomly, hosts in DC2 will say “Not Responding” and then 2 seconds
 later, the hosts will activate again.

 The strange thing is, when the manager was sitting on the same subnet as
 DC2, hosts in DC1 will randomly say “Not Responding”

 I have tried going through the logs, but I cannot see anything out of the
 ordinary regarding why the hosts would drop connection. I have attached the
 engine.log for anybody that would like to do a spot check.

 Thanks

 *Anton Louw*

 *Cloud Engineer: Storage and Virtualization* at *Vox*
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 www.vox.co.za

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-- 
Artur Socha
Senior Software Engineer, RHV
Red Hat

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Re: Random hosts disconnects