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Getting "A possible network anomaly was found" message


Question

I have 5 servers in a pool, named pool 1, pool 2, etc. Each server has 6 gig-e interfaces.

 

3 interfaces are in a bond (interfaces 0,2,3) that is is for connectivity to the SAN
2 interfaces are in a bond (interfaces 1,5) that is for internet connectivity
1 interface is for management

 

I'm getting the following message:

A possible network anomaly was found. The following hosts possibly have storage PIFs that are not dedicated:
pool-2: bond1 (uuid: da9f4e77-d22c-a20d-11f6-ae46f954dc60)
pool-1: bond0 (uuid: 1388ec2d-18bf-a6fa-ce17-63fc605f7b1f)
pool-3: bond1 (uuid: 6547619b-9772-12a9-08c5-29b163d289f0)

 

All servers are identical, were installed at the same time, and were added to the pool at the same time. I don't get this message for the other 2 servers. Any ideas??

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7 answers to this question

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On 8/1/2018 at 2:57 PM, Tobias Kreidl said:

I'd run ifconfig to make sure you see those PIFs and also check in XenCenter if the individual NIC assignments show up. Depending on th etype of SAN conenction, if iSCSi, you might need to do a an iscsiadm "rediscovery" process on that host.

 

-=Tobias

Thanks Tobias-

 

What I wound up doing was to remove all offending servers from the pool, reset all the physical interfaces and port channel interfaces on the switch, added the bonds to the standalone servers and confirmed all was good. Then I removed the bonds and added them to the pool and haven't heard a peep since.

 

 

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On 8/4/2018 at 10:13 AM, Tobias Kreidl said:

Bruce,

Sounds like you are in good shape now -- good to hear!

 

-=Tobias

Hello Tobias-

 

I experienced this again and did quite a bit of testing. I found the cause but don't know why; Oliver thinks it is a bug and once I upgrade to 7.5, I will try to reproduce it and send along to the Xen bug tracker if the issue persists. I posted about it on the XCP forums; I noticed you there and thought you might want to see.

 

https://xcp-ng.org/forum/topic/253/getting-a-possible-network-anomaly-was-found-message/10

 

Thanks for all you do for the Xen community.

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Just in general -- which may or may not be related to the issue here -- make sure your servers are all properly synchronized to NTP. You can check the offsets on each host with

"ntpstat -s" and make sure if you tie into an AD server for authentication that it uses the same NTP servers to synchronize to.

 

I hope going to XS/XCP-ng 7.5 will take care of fixing your issue!

 

-=Tobias

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Are these offsets within the proper bounds?

 

[20:44 xenserver1 log]# ntpstat -s
synchronised to NTP server (10.10.1.2) at stratum 2
   time correct to within 38 ms
   polling server every 1024 s

 

[20:45 xenserver2 ~]# ntpstat -s
synchronised to NTP server (10.10.1.2) at stratum 2
   time correct to within 43 ms
   polling server every 512 s

 

[20:44 xenserver3 ~]# ntpstat -s
synchronised to NTP server (10.10.1.2) at stratum 2
   time correct to within 43 ms
   polling server every 512 s
 

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