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Lars Ellenberg a écrit :
<blockquote cite="mid:20090216095024.GA9961@barkeeper1-xen.linbit"
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<pre wrap="">On Fri, Feb 13, 2009 at 10:55:50AM +0100, Julien Reveillet wrote:
</pre>
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<pre wrap="">I want the replication as synchronous as possible but as we're doing with a wan
network...
I know about the mysql replication which is true and is what we need but, we
need to pay a very expensive licence to the developper for this so i wanted to
find another cheaper solution. As i have no more choices, i will probably do
with it.
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<pre wrap=""><!---->
you have to pay for a built-in feature of a GPL'd data base server?
I'm sure I am missing something here.
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This is a commercial product which is based on Mysql 4.0.21.<br>
If we wanted to have a redundant server, we need to pay a heavy licence
to be able to replicate the database as it is considered as using 2
servers so we need 2 licences even if the database is under a GPL
licence...<br>
<blockquote cite="mid:20090216095024.GA9961@barkeeper1-xen.linbit"
type="cite">
<pre wrap="">
</pre>
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<pre wrap=""> - Will protocol C cause many heavy lags on my production server ?
(i guess yes but...)
the replication link is 2 megabit/second,
which is roughly 200 kByte per second.
and the latency is what? 200 msec?
well, DRBD cannot magically improve those numbers.
I don't think that would be feasibly for a cluster file system.
and not at all for a data base on top of a cluster file system.
I do not expect Drbd to be Harry Houdini... ;-) but i thought it can work if
protocol A was useable with both primary nodes.
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<pre wrap=""><!---->
no. it is not. it won't.
and it's not even DRBD per se, that will make it unusable,
but the idea of using a cluster file system via a WAN link.
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I understand that.<br>
<br>
Thanks anyway for yours answers.<br>
<br>
Best Regards,<br>
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