From mboxrd@z Thu Jan 1 00:00:00 1970 From: Daniel Phillips Date: Fri, 26 May 2006 10:23:02 -0700 Subject: [Ocfs2-devel] Fencing in OCFS2 In-Reply-To: <4476232F.2070700@google.com> References: <4476232F.2070700@google.com> Message-ID: <44773976.1060607@google.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: ocfs2-devel@oss.oracle.com Daniel Phillips wrote: > so with: > > A = 2 > B = 2 > H = 2 seconds > L = .5 seconds > W = 10 seconds > > we have: > > 8 + 1 + 10 = 19 seconds Oops, sorry, I should not have set W (maximum latency between watchdog trigger and shutdown) as high as 10, since the panic shuts down interrupts much faster than that, which in theory stops any disk or network hardware from transmitting. This should just take a few ms, however there may be write traffic in flight, so we need to set W to a second or two. This gets our "safe" watchdog wait down to 10 seconds or so, which is still twice as bad as the 5 seconds we get with storage side fencing. Regards, Daniel