Digimer the echo c > /proc/sysrq-trigger; command works fine the node with this command reboot thank to the fence-peer :) in a scenary without "fencing race", how the cluster take a decisition about what node reboot in the cable disconnection test? One question you think drbd works better in a pacemaker or cman environment? Emmanuel Your english is good, i preffer talk in spanish :P sorry for my bad english ever i learn so much thanks to this thread You never say me nothing about my delay fence line <fence_daemon clean_start="0" post_fail_delay="10" post_join_delay="30"/> Digimer And Emmanuel Thanks a lot for your help and patience On Fri, Jan 27, 2012 at 3:31 PM, Digimer <linux@xxxxxxxxxxx> wrote: > On 01/27/2012 03:20 PM, yvette hirth wrote: >> Digimer wrote: >> >>> You can crash the machine with this; >>> >>> echo c > /proc/sysrq-trigger >> >> will >> >> ifconfig ethx down (where "x" = heartbeat ethernet interface numbah) >> >> do the same thing? >> >> yvette > > Nope. The scenario is caused by both nodes being alive, but losing the > ability to talk to one another on the storage channel. Whether it is > because a given cable is unplugged or a bad firewall rule, the result is > the same; Both nodes see a failure at the same time and call their fence > handlers at the same time. The one with the sleep will delay, and thus, > always lose (and be the fence victim). > > The idea behind sending "c" to sysre-trigger is that it hangs the kernel > entirely. The hung node will no trigger it's fence, or do anything else > for that matter. Meanwhile, the node with the sleep will detect the > fault, call the agent, sleep for a few seconds, then proceed to fence > the hung node. This more accurately simulates an actual fault in the > primary node and confirms that the sleep'ed node will in fact fence > successfully. > > -- > Digimer > E-Mail: digimer@xxxxxxxxxxx > Papers and Projects: https://alteeve.com > > -- > Linux-cluster mailing list > Linux-cluster@xxxxxxxxxx > https://www.redhat.com/mailman/listinfo/linux-cluster -- Atte: ------------------------------------ Miguel Angel Guerrero Usuario GNU/Linux Registrado #353531 ------------------------------------ -- Linux-cluster mailing list Linux-cluster@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-cluster
