I wrote down what I do and why I do it here: https://alteeve.ca/w/2-Node_Red_Hat_KVM_Cluster_Tutorial#Network
As for what others do, I don't know. I always recommend removing *all* single points of failure in a cluster, so _everything_ I have is redundant. Some think it's overkill and may recommend different configurations. Being open-source, there is no single repository of documents that everyone follows. Some documents will argue one set of "best practices" while others argue that different "best practices" makes sense. You need to choose which is right for your needs and budget. On 12/03/2012 07:12 AM, Hermes Flying wrote: > These kind of deployments, are they part of a Linux-HA best practices > document? > E.g. the kind of backup defense you are using with the PDU is it > something of your flavor or is it common practice? > > > ------------------------------------------------------------------------ > *From:* Digimer <[email protected]> > *To:* Hermes Flying <[email protected]> > *Cc:* General Linux-HA mailing list <[email protected]>; > Andrew Beekhof <[email protected]> > *Sent:* Monday, December 3, 2012 2:07 PM > *Subject:* Re: [Linux-HA] Does stonith always succeed? > > Poorly. Stretch clusters are extremely difficult to build, which is why > I do not recommend building them. With few exceptions, tradition > remote-backup warm-spare servers is better than stretch clusters. > > On 12/03/2012 07:05 AM, Hermes Flying wrote: >> But this assumes that the servers are co-located, right? How is >> geo-separated nodes supported? >> >> >> ------------------------------------------------------------------------ >> *From:* Digimer <[email protected] <mailto:[email protected]>> >> *To:* General Linux-HA mailing list <[email protected] > <mailto:[email protected]>> >> *Cc:* Andrew Beekhof <[email protected] <mailto:[email protected]>>; > Hermes Flying >> <[email protected] <mailto:[email protected]>> >> *Sent:* Monday, December 3, 2012 1:18 PM >> *Subject:* Re: [Linux-HA] Does stonith always succeed? >> >> On 12/03/2012 06:11 AM, Andrew Beekhof wrote: >>> On Mon, Dec 3, 2012 at 9:03 PM, Hermes Flying <[email protected] > <mailto:[email protected]> >> <mailto:[email protected] <mailto:[email protected]>>> wrote: >>>> Hi, >>>> My understanding is that HA using Pacemaker is based on > fencing/STONITH . >>>> So my question is: Is STONITH guaranteed to ALWAYS succeed? >>> >>> No. >>> >>>> Are there cases when it fails? When? E.g. in specific deployments >> (example geo-separation)? >>> >>> Misconfiguration. Hardware failure. Plenty of reasons. >>> >>>> >>>> Thanks >> >> Nothing is computers is ever 100%. Anyone who tells you otherwise is a >> marketing drone. >> >> This is why, in my clusters, I always use two fence methods; I use IPMI >> (or iLO, DRAC, RSA) as the preferred fence device but, if that fails, I >> have switched PDUs as backup fence devices. >> >> A classic way that fencing can fail is, for example, the power feeding a >> server fails (like a fried power supply or blown motherboard) which cuts >> the power to the IPMI BMC. In this scenario, the IPMI BMC is down and >> can't reply to the other node. >> >> -- >> 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? >> >> > > > -- > 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? > > -- 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? _______________________________________________ Linux-HA mailing list [email protected] http://lists.linux-ha.org/mailman/listinfo/linux-ha See also: http://linux-ha.org/ReportingProblems
