But this assumes that the servers are co-located, right? How is geo-separated nodes supported?
________________________________ From: Digimer <[email protected]> To: General Linux-HA mailing list <[email protected]> Cc: Andrew Beekhof <[email protected]>; Hermes Flying <[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]> 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? _______________________________________________ Linux-HA mailing list [email protected] http://lists.linux-ha.org/mailman/listinfo/linux-ha See also: http://linux-ha.org/ReportingProblems
