On Jan 10, 2012, at 2:59 PM, Rafał Radecki <radecki.rafal at gmail.com> wrote: > Hi all. > > I am currently working for a hosting provider in a 100+ linux hosts' > environment. We have www, mail HA solutions, as storage we mainly use > NFS at the moment. We are also using DRBD, Heartbeat, Corosync. > > I am now gathering info to make a cluster with: > - two virtualization nodes (active master and passive slave); > - two storage nodes (for vm files) used by mentioned virtualization > nodes (also active/passive). > > For virtualization I am thinking to use OpenVZ or KVM. For storage NFS > or iSCSI. Could you please share your experiences with these > technologies? Which one would you use and why? Are there any good > alternatives in CentOS? For Linux virtualization on a scale greater then a couple of hosts I'd buy VMware and get a good SAN box with redundancy, say EMC, 3Par, NetApp or one of the middle tier like Equallogic, Lefthand or Compellent. Otherwise a Xen cluster with an NFS store for the VM files (ease of management) and iSCSI for their data partitions (performance) using DRBD for fault tolerance. -Ross