Re: [lvs-users] Persistent connections not persisting after failover

To: " users mailing list." <lvs-users@xxxxxxxxxxxxxxxxxxxxxx>
Subject: Re: [lvs-users] Persistent connections not persisting after failover
Cc: Horms <horms@xxxxxxxxxxxx>
From: Joseph Mack NA3T <jmack@xxxxxxxx>
Date: Tue, 19 Aug 2008 15:19:12 -0700 (PDT)
On Tue, 19 Aug 2008, Nicholas Guarracino wrote:

>> is there persistence on the backup director?
> Yes, ipvs is using persistence on both servers. Or do you 
> mean the sync daemon?

sorry, I was ambiguous. On the backup director, when it's 
receiving updates from the syncd on the master director, do 
you see the persistence flag? Come to think of it, I don't 
know if the persistence on the backup director comes from 
the synchd updates or from running ipvsadm when the 
backup becomes the master :-(

> Initially I was thinking that no persistence would be 
> needed at all for the SH scheduler, but it looks like 
> that's not the case since I'm assuming the list of 
> available realservers could be filled in any order?

This was my reservation when I mentioned the -SH scheduler. 
I don't know what would happen there and I expect noone's 
tried it.

> I did see some of the updates you mentioned. They seemed 
> mostly related to highly loaded systems, and instead of 
> sleeping for a fixed amount of time, waking up whenever 
> there is data to process. I doubt those changes would help 
> here since I only have two clients connected, but a later 
> kernel is definitely worth trying.

I wasn't real hopeful of anything in there being the cure, 
but if you could reproduce the problem with a recent kernel, 
it would save us tracking down a problem that was solved 
long ago, even if then it wasn't showing the symptoms you've 
got now.

Joseph Mack NA3T EME(B,D), FM05lw North Carolina
jmack (at) wm7d (dot) net - azimuthal equidistant map
generator at
Homepage It's GNU/Linux!

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