On Tue, May 27, 2014 at 9:04 PM, Sharmila Govind <sharmilagovind at gmail.com> wrote: > Hi, > > I am setting up a ceph cluster for some experimentation. The cluster is > setup successfully. But, When I try running rbd map on the host, the kernel > crashes(system hangs) and I need to do a hard reset for it to recover. Below > is my setup. > > All my nodes have Linux kernel 3.5 with Ubuntu 12.04. Iam installing the > emperor version of Ceph. It would help if you could capture the crash, but most probably it's a known bug in 3.5, which leads to a crash instead of returning an error to 'rbd map' when the kernel misses required feature bits, i.e. too old. I would recommend running at least 3.9. Thanks, Ilya