Greetings, On Mon, Feb 8, 2010 at 8:19 PM, Bob Peterson <rpeterso@xxxxxxxxxx> wrote: > ----- "Muhammad Ammad Shah" <mammadshah@xxxxxxxxxxx> wrote: > | when a node(x) fenced by another node(y), will it corrupts the file > | system or no? and if the database was running and node(x) fenced by > | fenced node(y) will it corrupts the database or whats about the > | transaction ? > > With GFS and GFS2 there should be no metadata corruption, in theory. > When quorum is regained (or if it's not lost) the fenced > node's journal is replayed so the file system metadata should > remain intact. That does not mean that data won't be lost. > If the node was fenced while it had data in its cache, that data > may be lost. In critical situations, you can mark files and/or > directories with a flag that makes the data journaled as well, > so the data should be protected. Of course, that has a performance > penalty. There's a small section about this in the GFS faq. Whatever Rob says is absolutely correct. Having said that, IIRC DBs like Oracle writes to disks every 3 seconds and Linux flushes to disk every five seconds anyways. So, one can say that the the data loss window could be at most 5 seconds. Am I right? Thanks and regards, Rajagopal -- Linux-cluster mailing list Linux-cluster@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-cluster
