LVS
lvs-users
Google
 
Web LinuxVirtualServer.org

Re: Issue in Failover of LVS

To: Horms <horms@xxxxxxxxxxxx>
Subject: Re: Issue in Failover of LVS
Cc: "'Linux Virtual Server'" <lvs-users@xxxxxxxxxxxxxxxxxxxxxx>
From: wanger@xxxxxxxxxx
Date: Fri, 03 Mar 2000 10:10:54 -0500
On Thu, 2 Mar 2000 21:38:47 -0800, Horms wrote: 

>Are there just 5 ARPs or 5 to start this and then more gratuitous
>ARPs at regular intervals. If the gratuitous ARPs only occur at
>fail-over then once the ARP caches on hosts expire there is
>a chance that a failed host - whose kernel is still functional -
>could reply to an ARP request.

When we put this together, I talked to Alan Cox about this.  His 
opinion was that send 5 ARPs out at 2 seconds apart.  If there is 
something out there listening and cares, then it will pick it up.

THe way piranha works, as long as the kernel is alive, the backup (or 
failed node) will not maintain any interfaces that are Piranha managed. 
In other words, it removes any of those IPs/interfaces from its routing 
table upon failure recovery.

Mike

-----------------------------------------------------------------------
Mike Wangsmo                                               Red Hat, Inc 

"I've seen this before in Montana!  Its snowing, nobody lick a flag
pole" -- Peggy Hill




<Prev in Thread] Current Thread [Next in Thread>