Emmanuel Noobadmin wrote, On 08/03/2010 11:13 AM: > From what I understand, I cannot do the equivalent of network RAID 1 > with a normal DRBD/HB style cluster. Gluster with replicate appears to > do exactly that. I can have 2 or more storage servers with real time > duplicates of the same data so that if any one fails the cluster does > not run into problem. By using gluster distribute over pairs of > server, it seems that I can also easily add more storage by adding > more pairs of replicate server. To have more than one active server with DRBD (or other disk type shared between active machines) you need to be using a file system which supports shared disk resources. http://www.drbd.org/docs/about/ http://www.drbd.org/users-guide-emb/s-dual-primary-mode.html http://www.drbd.org/users-guide-emb/ch-gfs.html http://www.drbd.org/users-guide-emb/ch-ocfs2.html and perhaps using Gluster (Raid0 on net) with DRBD (Raid 1 on net) as disk space to get HA into Gluster? http://www.drbd.org/users-guide-emb/ch-xen.html Note that it has been a while since I have ran DRBD on a set of systems and I only ran in active-passive with ext3, so I only know about the resources above that someone would want to look at. -- Todd Denniston Crane Division, Naval Surface Warfare Center (NSWC Crane) Harnessing the Power of Technology for the Warfighter