Could you explain me some more how i could use dual controllers ? Is
this done with special harddisks ? What hardware do i need to do this ?
/Z.
trixter http://www.0xdecafbad.com wrote:
One thing that could be done is to have a disk array for voicemail and
all with dual controllers. Then plug that into each of two servers.
Bind the IP components to a IP that is transportable between machines.
When one fails ifconfig the failover machine to use that IP (could be a
virtual interface).
Veritas HA works similiarly that way. Via a serial cable there are
'global atomic broadcasts' basically a ping. If the ping fails to occur
the machine marked backup assumes the IP for all services of the
primary. Because it has access to the same disks it can mount them and
carry on like nothing happened.
Veritas seperates services from the machine. If you have say a web
server, mail, and SIP you would have each one on a seperate IP so that
if any one single service fails that one and only that one can be moved
to the backup server. With asterisk this may be overkill.
MAC addresses are the only other problem. Veritas accomplishes this by
MAC spoofing. Cisco PIX do as well. You might, depending on specific
ethernet driver, be able to ifconfig eth0 headdr 00:00:de:ca:fb:ad.
Just a thought.
On Wed, 2005-04-27 at 08:33 +0100, Jason Williams wrote:
On 4/26/05, snacktime <[EMAIL PROTECTED]> wrote:
On 4/26/05, Sean Kennedy <[EMAIL PROTECTED]> wrote:
Hi folks,
I'm curious; What does everyone do for failover? I have two servers,
same os/compilation. I designate one the master, the other the slave,
and I rsync the config files once an hour and trigger a restart when
convenient command on the console. These two servers are setup in the
dns in a round robin fashion.
What is everyone else doing?
That's kind of a loaded question... Do you plan on expanding? What
is your budget? What are your uptime requirements? Are you serving
customers or is this just for internal use?
The biggest problem with that solution is voicemail it could get left
on one server and not be on the other for one hour.
Jason
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