> -----Original Message----- > From: centos-bounces at centos.org [mailto:centos-bounces at 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