The only load balancing that CARP supports, to my knowledge, is ARP
level load balancing. From carp(4):
The ARP load balancing has some limitations. First, ARP balancing only
works on the local network segment. It cannot balance traffic that
crosses a router, because the router itself will always be balanced to
the same virtual host.
Ross Draper wrote:
Hi
Firstly, many thanks to Stefan (who provided me a diff of the CURRENT
update) and Bruce for advising me that the "multiple CARP interface
destroy" bug is fixed in CURRENT.
Jordan, thanks for your reply, but I cant find a reference to CARP
being unsuitable for this purpose in the CARP man page, have I perhaps
misunderstood you? I also did a quick search of the freebsd.org site
and cant find any mention of it being an issue - If you could provide
me with a link I'd be grateful.
Further to this, I have been in the office today performing local
testing as opposed to remote testing and have noticed that when both
machines in the cluster are using xl network cards, failover etc seems
fine. However, when having one node using xl and the other using
em/bge I can see the em or bge card physically go down after it
reverts to backup mode, then come back up and goto master. (this wasnt
displaying in the messages log, but was obvious on the console). I
believe that this down period is sufficient for it to miss the
remaining advertisements and believe it is the master again. For some
reason it doesnt seem to ever remove the mac address or recover after
this point, but I'm not particularly suprised. Not sure how to take
this further, but I'll continue fiddling.
Many thanks
Ross
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