Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
On 17/11/15 12:56 AM, Waldemar Brodkorb wrote: > Hi, > Digimer wrote, > >> I understand the rationale and disagree with it, strongly. The build >> order should be; >> >> 1. Initial node config >> 2. Stonith >> 3. everything else >> >> Stonith is not a feature, it is a requirement of any sane setup, full stop. >>> Quoting the fine documentation: >>> >>> "stonith-enable=false tells the cluster to simply pretend that failed >>> nodes are safely powered off". >> >> You can drive your car without seatbelts, too. You can pull the fuse on >> your airbag system. You car still moves. >> >> I have yet to see a use-case where disabling stonith is a valid setup. > > We are using DRBD on our management system (monitoring, backup, > update of the other cluster systems) for non-important data. > Icinga status file, intermediate backup files, ... > To avoid split-brain we use pingd, which helps for simple network > problems. If the data is lost, we can simple rebuild the DRBD, as > our important data is either in a master-master ldap or > master-master mysql database. It is not always possible to setup > STONITH if you don't get access to the underlying ESXi hosts or > hardware. So I think we have a valid use-case for DRBD+Pacemaker > without STONITH+Fencing. > > best regards > Waldemar The pingd approach won't save you from a split-brain and thus data loss. If you say that you don't mind losing data, then I question the entire approach. The only time not using fencing is not insane is when you have 100% manual failure and you trust your admins to not screw up recovery (when they're under pressure/being yelled at/haven't touched HA in months). So no, I don't think this is a valid use-case... Accepting data loss is not an acceptable case in HA, period. Maybe you think so in your case. -- Digimer Papers and Projects: https://alteeve.ca/w/ What if the cure for cancer is trapped in the mind of a person without access to education?