On 18/04/17 04:08 AM, Christine Caulfield wrote: > >> >> This isn't the first time this has come up, so I decided to elaborate on >> this email by writing an article on the topic. >> >> It's a first-draft so there are likely spelling/grammar mistakes. >> However, the body is done. >> >> https://www.alteeve.com/w/The_2-Node_Myth >> > > An excellent article. One small point I noticed though. "Fabric Fencing" > more usually refers to SCSI reservation fencing (hence it does not > isolate the node from the cluster, just shared storage) - often over > Fibre-channel (hence "fabric") though I believe iSCSI supports it too. > > While this doesn't take the node out of the cluster it does prevent > damage to shared storage and allows non-clustered applications to > continue working if it's just the cluster network interconnect that has > failed. > > IMO SCSI fencing should never be used on a 2 node cluster for reasons > you have already described very clearly. > > Chrissie
I was fairly generic on that term because I've seen (and even wrote one!) where snmp was used to drop the ethernet switch ports to a target. It is worth clarifying though. cheers -- Digimer Papers and Projects: https://alteeve.com/w/ "I am, somehow, less interested in the weight and convolutions of Einstein’s brain than in the near certainty that people of equal talent have lived and died in cotton fields and sweatshops." - Stephen Jay Gould _______________________________________________ Users mailing list: Users@clusterlabs.org http://lists.clusterlabs.org/mailman/listinfo/users Project Home: http://www.clusterlabs.org Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf Bugs: http://bugs.clusterlabs.org