Posted on Mon 19 March 2012 in presentations • Tagged with DRBD, KVM, libvirt, Pacemaker • 1 min read
Tim Serong and I explore the capabilities of KVM, iSCSI, DRBD and Pacemaker to create a fully open-source enterprise cloud.
Shot at linux.conf.au 2011 in Brisbane, this is me babbling, and Tim live-cartooning to the delight of the audience.
This article originally appeared on the hastexo …
Posted on Thu 15 March 2012 in hints-and-kinks • Tagged with Corosync • 2 min read
Occasionally, you may see errors similar to this in your system logs:
corosync [TOTEM ] Retransmit List: e4 e5 e7 e8 ea eb ed ee
Here’s what causes them, and what you can do to fix the issue.
Corosync, more specifically its Totem protocol implementation, defines a maximum number of …
Posted on Tue 13 March 2012 in presentations • Tagged with Conference, Pacemaker • 1 min read
Posted on Fri 09 March 2012 in hints-and-kinks • Tagged with Ceph • 2 min read
Ever wanted to know just which of your OSDs a RADOS object is currently stored in? Here’s how.
Suppose you’ve got an RBD device, named test. Then you can use the
rbd info command to display which name prefix is used by the RADOS
objects that make up …
Posted on Tue 06 March 2012 in hints-and-kinks • Tagged with DRBD • 3 min read
Whenever a DRBD setup runs into a situation where the replication
network is disconnected and fencing policy is set to dont-care
(default), there is the potential risk of a split-brain. Even with
resource level fencing or STONITH setup, there are corner cases that
will end up in a split-brain.
When …