-----Original Message----- From: centos-bounces@centos.org [mailto:centos-bounces@centos.org]On Behalf Of Johnny Hughes Sent: Friday, March 17, 2006 3:31 AM To: CentOS ML Subject: Re: [CentOS] High-Availability Clustering and drbd?
On Thu, 2006-03-16 at 23:52 -0800, Benjamin Smith wrote:
Ugh. What a week!
Anyway, my situation is that we have a production server in San
Fransisco, and
a "hot" backup in my hometown (Chico, CA) .
What I'd like to do is mirror the production server to the
local one, so that
if the SF server goes down, we have work saved to the last
possible moment.
Say, within 10 minutes.... Is this feasible?
I don't think something like DRBD is going to work very well across a WAN link. The amount of traffic generated by drbd can be pretty large, it is enough that I normally use a gigabit crossover cable between 2 servers (if possible) when using drbd on them.
I would think that rsyncs of the appropriate directories at a period in time might be the best way to handle this.
I am getting ready to do this in then next week or so myself ... if I have any luck, I'll tell you what solution I found. In my case I am also worried about a mysql database that has live info in it ... and an ldap database too.
Good to know the bandwidth requirements of DRBD before trying it over our WAN. We use rsync to keep a directory structure in sync with a backup server on the other side of the contry. In total the directory is about 34GB and consists of images of scanned documents ov verious sizes. We shoot this over a T1 across the US and once the original sync is done, it does a nice job a couple times a day checking and updating differences.
I have also played with Unison (http://www.cis.upenn.edu/~bcpierce/unison/) with some success, but ended up using rsync for another project.
As for MySQL over WAN, how have people done with the built in replication?
Andrew