I might be able to add NIC's -the machines are geographically quite far from me so will have to get some one to check first but say there is NIC space, will DRBD behave if I change the replicating IP addresses? Can you reccomend a procedure to follow in this case?<br>
<br><br><br><br><div class="gmail_quote">On 17 February 2012 14:28, David Coulson <span dir="ltr"><<a href="mailto:david@davidcoulson.net">david@davidcoulson.net</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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Can you add NICs? There should be no requirement for DRBD
replication to happen over any particular interface, and obviously
having it's own dedicated interfaces without a switch is much nicer
than what you have now.<br>
<br>
DRBD doesn't support multiple networks, as it uses a constant TCP
Connection for updates - You could probably do it with some routing
protocol, but that'd be really ugly.<div><div class="h5"><br>
<br>
<br>
<br>
On 2/17/12 7:21 AM, Lawrence Strydom wrote:
<blockquote type="cite">Hi Dave,<br>
<br>
Thanks for all the help - The default log rotation time for ubuntu
seems to be 7 days so it seems this will remain a mystery.<br>
<br>
A dedicated cross over for replication is not an option because
the web servers connect to the DB over the same link. Is it
possible to add the public interface as a second replication
interface? Do I simply add it in the .res file with the existing
ip address?<br>
<br>
The setup was primary/primary uptodate/uptodate before I copied
the sites across. It then sat for a couple weeks doing nothing
untill this week when dev tested on it and this hapenned.<br>
<br>
L<br>
<br>
<br>
<br>
<div class="gmail_quote">
On 17 February 2012 14:01, David Coulson <span dir="ltr"><<a href="mailto:david@davidcoulson.net" target="_blank">david@davidcoulson.net</a>></span>
wrote:<br>
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<div> <br>
<br>
On 2/17/12 6:56 AM, Lawrence Strydom wrote:
<blockquote type="cite">Couldn't find any PingAck's in the
syslog - what else could have caused the split brain?<br>
</blockquote>
<br>
</div>
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<span>./syslog.2:Feb 15 13:40:35 web02 kernel: [ 16.455206] block drbd0: self D3CCDACF6FD7FDB8:4579E80074D400D3:C117CFF0A5777F0F:0000000000000004 bits:14607528 flags:0
./syslog.2:Feb 15 13:40:35 web02 kernel: [ 16.455211] block drbd0: peer 37C841BC2AA49AC4:4579E80074D400D3:C117CFF0A5777F0F:0000000000000004 bits:1407177 flags:0
./syslog.2:Feb 15 13:40:35 web02 kernel: [ 16.455215] block drbd0: uuid_compare()=100 by rule 90
./syslog.2:Feb 15 13:40:35 web02 kernel: [ 16.455217] block drbd0: Split-Brain detected, dropping connection!
Was this ever really primary/primary, uptodate/uptodate? I can't find anything in the logs indicating that it was ever truly dual primary. Your logs seem to rotate quickly, so if you are really only keeping logs going back three days you'll probably never know root cause.
Personally, I'd bypass the switch and go with a cross-connect direct between the boxes - Or two if you have enough NICs.
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