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From their website:
DRBD is a block device which is designed to build high availability clusters. This is done by mirroring a whole block device via (a dedicated) network. You could see it as a network raid-1.

DRBD takes over the data, writes it to the local disk and sends it to the other host. On the other host, it takes it to the disk there.

Compare:
1. MySQL Clustering(ndb-cluster stogare)
2. MySQL / GFS-GNBD/ HA
3. MySQL / DRBD /HA
4. MySQL Write Master / Multiple MySQL Read Slaves
5. Standalone MySQL Servers(Functionally seperated)

Hi,

I'm interested in peoples thoughts on the best choice for a database clustering solution.

I have a database that is mostly varchars and numbers that doesn't store any binary data at all. It's used at about 70% read and 30% writes - though we're using memcached at the moment so it's not really hit that hard.

We're currently using mysql with m/cluster, but are interested in a new solution. Possible candidate so far are unicluster (which doesn't seem mature yet.) or DRBD.

Had anyone had a similar experience and can make any suggestions?

Thanks