On 26 October 2012 15:37, Todd Lipcon <t...@cloudera.com> wrote: > NFS Locks typically last forever if you disconnect abruptly. So they are > not sufficient -- your standby wouldn't be able to take over without manual > intervention to remove the lock.
+1. This is why you are told to mount your shared edit log NFS servers with the "soft" option -otherwise you can't swap over to the other machines. see: http://www.faqs.org/docs/linux_network/x-087-2-nfs.mountd.html > > If you want to build an unreliable system that might corrupt your data, > you could set up 'shell(/bin/true)' as a second fencing method. But, it's > really a bad idea. There are failure scenarios which could cause split > brain if you do this, and you'd very likely lose data > You could do it on a cluster where you were prepared to lose/corrupt all the data. But in that world: why bother?
