On Mon, 2009-07-27 at 10:45 -0300, Gilberto Nunes wrote: > Hi everybody > > I have some doubt here... > I deply two virtual server (KVM) with Ubuntu 9.04 > I had install drbd via apt-get. > Everything is work fine... > I had two nodes, node-A and node-B. > I can turn node-B as primary and return node-A as a primary... > I can mount /dev/drbd0 on node-A and node-B as well... > But, when I write some files on node-B, on mounted /dev/drbd0, when I > turn back node-A as a primary, on I had write on node-B do not appear on > node-A!! :| > > I do not any ideia what is going on!!!
DRBD replicates blocks from one device to another, across a network. It does not know anything about the filesystem, so you MUST use a cluster-aware filesystem (GFS/GFS2 or OCFS2) if you want to mount the DRBD device on both servers at the same time. EXT3 is NOT cluster-aware, and you will LOOSE DATA if you try and mount an EXT3 DRBD filesystem on both servers at the same time. If you are just looking for Active/Passive fail-over, with a replicated EXT3 partition, then you can use DRBD with heartbeat to achieve this. Heartbeat will ensure that only one device has the partition mounted at any one time. The DRBD users guide gives comprehensive details on using DRBD with Heartbeat: http://www.drbd.org/users-guide/ch-heartbeat.html Mark. -- Mark Watts BSc RHCE MBCS Senior Systems Engineer QinetiQ Applied Technologies GPG Key: http://www.linux-corner.info/mwatts.gpg
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