[PVE-User] Proxmox servers don't see each other anymore

[Gerald Brandt]

I just did an omping test. It doesn't look good.

#parallel-ssh -i -H "proxmox-0 proxmox-1 proxmox-2" -A -l root -t 0 omping -c 600 -i 1 -q proxmox-2 proxmox-1 proxmox-0
Warning: do not enter your password if anyone else has superuser
privileges or access to your account.
Password:
[1] 10:13:49 [SUCCESS] proxmox-1
proxmox-2 : waiting for response msg
proxmox-0 : waiting for response msg
proxmox-0 : joined (S,G) = (*, 232.43.211.234), pinging
proxmox-2 : joined (S,G) = (*, 232.43.211.234), pinging
proxmox-2 : given amount of query messages was sent
proxmox-0 : given amount of query messages was sent

proxmox-2 :   unicast, xmt/rcv/%loss = 600/600/0%, min/avg/max/std-dev = 0.058/0.193/0.997/0.099
proxmox-2 : multicast, xmt/rcv/%loss = 600/467/22% (seq>=2 22%), min/avg/max/std-dev = 0.063/0.217/0.571/0.101
proxmox-0 :   unicast, xmt/rcv/%loss = 600/600/0%, min/avg/max/std-dev = 0.060/0.238/0.633/0.133
proxmox-0 : multicast, xmt/rcv/%loss = 600/467/22% (seq>=2 22%), min/avg/max/std-dev = 0.066/0.261/0.636/0.131
[2] 10:13:50 [SUCCESS] proxmox-2
proxmox-1 : waiting for response msg
proxmox-0 : waiting for response msg
proxmox-0 : joined (S,G) = (*, 232.43.211.234), pinging
proxmox-1 : waiting for response msg
proxmox-1 : joined (S,G) = (*, 232.43.211.234), pinging
proxmox-0 : given amount of query messages was sent
proxmox-1 : given amount of query messages was sent

proxmox-1 :   unicast, xmt/rcv/%loss = 600/600/0%, min/avg/max/std-dev = 0.054/0.168/0.703/0.090
proxmox-1 : multicast, xmt/rcv/%loss = 600/311/48%, min/avg/max/std-dev = 0.066/0.222/0.803/0.131
proxmox-0 :   unicast, xmt/rcv/%loss = 600/600/0%, min/avg/max/std-dev = 0.050/0.271/0.584/0.132
proxmox-0 : multicast, xmt/rcv/%loss = 600/311/48% (seq>=2 48%), min/avg/max/std-dev = 0.073/0.299/0.590/0.131
[3] 10:13:50 [SUCCESS] proxmox-0
proxmox-2 : waiting for response msg
proxmox-1 : waiting for response msg
proxmox-2 : waiting for response msg
proxmox-1 : waiting for response msg
proxmox-1 : joined (S,G) = (*, 232.43.211.234), pinging
proxmox-2 : joined (S,G) = (*, 232.43.211.234), pinging
proxmox-2 : given amount of query messages was sent
proxmox-1 : given amount of query messages was sent

proxmox-2 :   unicast, xmt/rcv/%loss = 600/600/0%, min/avg/max/std-dev = 0.078/0.339/0.735/0.124
proxmox-2 : multicast, xmt/rcv/%loss = 600/437/27%, min/avg/max/std-dev = 0.126/0.361/0.763/0.128
proxmox-1 :   unicast, xmt/rcv/%loss = 600/600/0%, min/avg/max/std-dev = 0.096/0.324/0.801/0.134
proxmox-1 : multicast, xmt/rcv/%loss = 600/437/27%, min/avg/max/std-dev = 0.103/0.376/0.807/0.158
gbr at C-00000013:~$



On 2017-06-20 06:54 AM, Uwe Sauter wrote:
> Am 20.06.2017 um 13:53 schrieb Gerald Brandt:
>>
>> On 2017-06-20 06:30 AM, Barry Flanagan wrote:
>>> Hi Dmitry
>>> Regarding "enable it on your servers" - is it safe to enable this on all
>>> servers in the cluster, or must it only be on one? We recently suffered an
>>> issue on our network where multicast stopped working (an old switch was
>>> removed and obviously it was performing the querier function) and I had to
>>> change to unicast just to get things running again. I want to move back to
>>> multicast but don't want to rely on it being enabled on the switches as I
>>> do not control them.
>>>
>>> Thanks (and apologies for the slight thread hijack)
>>>
>>> -Barry Flanagan
>>>
>> I can temporarily fix the issue by going unicast? Are there instructions on how to do that? A quick search didn't bring anything
>> up for me.
> https://pve.proxmox.com/wiki/Multicast_notes#Use_unicast_.28UDPU.29_instead_of_multicast.2C_if_all_else_fails
>
>
>
>> Gerald
>>
>>
>>>> 19.06.2017 18:07, Gerald Brandt пишет:
>>>>> I can still ping each server when there is an issue. Don't want to power
>>>> cycle the switches during the workday, but may have to.
>>>>> On 2017-06-19 09:57 AM, Gilberto Nunes wrote:
>>>>>> Probably some network trouble??
>>>>>> Did you check cables, swotch and so on??
>>>>>> When the problem appears, can you ping each server?
>>>>>>> My proxmox server intermittently don't see each other anymore. I keep
>>>>>>> losing quorum.
>>>>>>>
>>>>>>> I have 3 Proxmox servers, and they will randomly not see each other.
>>>> For a
>>>>>>> few seconds proxmox-2 will see proxmox-1, but not proxmox-3. Then it'll
>>>>>>> switch and proxmox-2 will only see proxmox-3, then it will see no one
>>>> but
>>>>>>> itself.
>>>>>>>
>>>>>>> I have the IP and names in /etc/hosts and in DNS.
>>>>>>>
>>>>>>> Any idea where I can start looking?
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