I have an existing in-production LAMP server running Centos 5.1. It uses physical partitions on top of hardware RAID1, having / /home /var and /boot on separate partitions. We have a near-identical system I am thinking of bringing in as a DRBD/Heartbeat companion. One solution may be to use csync2 [http://oss.linbit.com/csync2/] on /etc and /usr/local (the only areas that will differ from the stock CentOS). Then setup DRBD for /home and /var. From reading the docs it seems we have to use "external meta data" on the existing partitions. Other than that, anyone have any caveats or better ideas for this setup? Also - each has 2 NICs. Can Heartbeat do its pinging over the WAN (eth0) with eth1 dedicated to DRBD only? Is that how it is supposed to be, or should we use the serial ports? Sam