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.
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.
On 2/17/12 7:21 AM, Lawrence Strydom wrote:
Hi Dave,
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.
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?
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.
L
On 17 February 2012 14:01, David Coulson <[email protected]
<mailto:[email protected]>> wrote:
On 2/17/12 6:56 AM, Lawrence Strydom wrote:
Couldn't find any PingAck's in the syslog - what else could have
caused the split brain?
./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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