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Re: anyone used director failover in production?

To: lvs-users@xxxxxxxxxxxxxxxxxxxxxx
Subject: Re: anyone used director failover in production?
From: Matthew Crocker <matthew@xxxxxxxxxxx>
Date: 23 May 2002 08:42:37 -0400
I have a production LVS server running with 3 real servers handling
SMTP, POP3, IMAP for our QMAIL server.  We process about a million
inbound connections a day.  I've never had the primary LVS server crash
but I have shut it down on purpose (yanked the power cord) to test the
fail over.  Everything worked perfectly.

[root@lvsd-1 /root]# uname -a
Linux lvsd-1.crocker.com 2.4.9 #1 Tue Aug 28 11:42:10 EDT 2001 i686
unknown

[root@lvsd-1 /root]# uptime
  5:27am  up 71 days, 16:47,  1 user,  load average: 1.06, 1.03, 1.00
[root@lvsd-1 /root]# /sbin/ipvsadm -L
IP Virtual Server version 0.9.3 (size=65536)
Prot LocalAddress:Port Scheduler Flags
  -> RemoteAddress:Port             Forward Weight ActiveConn InActConn
TCP  mail.crocker.com:smtp lc
  -> cw-3-e0.crocker.com:smtp       Route   1      79         194
  -> cw-1-e0.crocker.com:smtp       Route   1      78         228
  -> cw-2-e0.crocker.com:smtp       Route   1      81         116
TCP  mail.crocker.com:pop3 lc
  -> cw-1-e0.crocker.com:pop3       Route   1      2          42
  -> cw-3-e0.crocker.com:pop3       Route   1      1          45
  -> cw-2-e0.crocker.com:pop3       Route   1      1          44
TCP  mail.crocker.com:imap2 lc
  -> cw-1-e0.crocker.com:imap2      Route   1      3          2
  -> cw-3-e0.crocker.com:imap2      Route   1      2          3
  -> cw-2-e0.crocker.com:imap2      Route   1      3          1


On Thu, 2002-05-23 at 06:58, Joseph Mack wrote:
> From what I can tell (small number of anecdotes), director
> failover is mainly used for planned maintenance and so that
> management can tell customers that their setup has redundancy.
> I haven't heard any stories of failover working in production.
> 
> Does anyone have director failover in a production setup, when
> directors have failed and changed over automatically and you've
> only found out about it when the failover mechanism notified
> you (rather than the customers notifying you)?
> 
> If so, I'd like to put the info into the HOWTO. Please let
> me know what failed, what system you're using for failover,
> and anything else of interest.
> 
> Thanks Joe
> 
> -- 
> Joseph Mack PhD, Senior Systems Engineer, Lockheed Martin
> contractor to the National Environmental Supercomputer Center, 
> mailto:mack.joseph@xxxxxxx ph# 919-541-0007, RTP, NC, USA
> 
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