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DHCP failover pair keeps going into recover-wait state on NIOS 8.4.1

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Hey all,

 

Just an observation, we have deployed a new grid running NIOS 8.4.1. Every time we add new scopes to the DHCP failover association one of the peers goes into recover-wait state, and stays in this state for around MCLT (1 hour) before eventually returning to normal.

 

We're not entirely sure what's happening, the servers aren't heaviliy utilised yet, I think there's only a couple thousand leases so shouldn't take this long to sync leases each time.

 

We will send support bundles into support, but it's happened a couple times now and I'm just a little curious that this is not normal. Has anyone else seen anything like this on NIOS 8.4.x?

 

Cheers,

 

Paul

 

Paul Roberts
PCN (UK) Ltd

All opinions expressed are my own and not representative of PCN Inc./PCN (UK) Ltd. E&OE
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Re: DHCP failover pair keeps going into recover-wait state on NIOS 8.4.1

[ Edited ]
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It should do that only during a Force Recovery to recover from conflicts or while resuming operations after a Partner Down state on its peer.

I agree it is not ideal and is ambiguous. Are you able to replicate it in lab and do you find any NIC down (eth1/eth2/LAN1/VIP is down syslog/debug log messages) or communication issues between the failover peers?

Kindly open a case with Infoblox support.

 

 

Best Regards,

Bibin Thomas 


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Re: DHCP failover pair keeps going into recover-wait state on NIOS 8.4.1

Expert
Posts: 246
981     0

Thanks, I did pull the support bundles and took a look through the logs but couldn't find anything suspicious. We added more scopes last Friday and didn't have any problems so maybe it was just one-off. We are adding the final batch of scopes this weekend so will see how we get on then and if we have more problems we'll pull another set of support bundles and log a ticket.

Paul Roberts
PCN (UK) Ltd

All opinions expressed are my own and not representative of PCN Inc./PCN (UK) Ltd. E&OE
Highlighted

Re: DHCP failover pair keeps going into recover-wait state on NIOS 8.4.1

[ Edited ]
Moderator
Moderator
Posts: 145
981     0

Hello again Paul,

I got to learn from Engineering that this is a major change that went into 8.4.x.

There is a chance for the FOA to goto recover-wait for ~MCLT time [especially while moving ranges back and forth from single-member-->FOA] and the change was done to overcome an issue much larger in impact [Pool rebalancing failure for 1/multiple/all dhcp ranges].

We will request to have this documented well in the Administrator Guide but unfortunately the only suggestion I have for customers making such changes are to plan such changes in a maintenance window of [Time required for the change+MCLT].

 

 

Best Regards,
Bibin Thomas

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