On Fri, Aug 5, 2016 at 7:08 AM, Digimer <[email protected]> wrote: > On 04/08/16 11:44 PM, Andrei Borzenkov wrote: >> 05.08.2016 02:33, Digimer пишет: >>> On 04/08/16 07:21 PM, Dan Swartzendruber wrote: >>>> On 2016-08-04 19:03, Digimer wrote: >>>>> On 04/08/16 06:56 PM, Dan Swartzendruber wrote: >>>>>> I'm setting up an HA NFS server to serve up storage to a couple of >>>>>> vsphere hosts. I have a virtual IP, and it depends on a ZFS resource >>>>>> agent which imports or exports a pool. >> >> ... >> >>> >>> Note; If you lose power to the mainboard (which we've seen, failed >>> mainboard voltage regulator did this once), you lose the IPMI (DRAC) >>> BMC. This scenario will leave your cluster blocked without an external >>> secondary fence method, like switched PDUs. >>> >> >> As in this case there is shared storage (at least, so I understood), >> using persistent SCSI reservations or SBD as secondary channel can be >> considered. > > Yup. That would be fabric fencing though, or are you talking about using > it under watchdog timers?
fabric is the third possibility :) No, I rather mean something like fence_scsi. Although the practical problem of both fabric or scsi fencing is that it only prevents concurrent access to shared storage; it does not guarantee that other resources are also cleaned up, so may end up with duplicated IP or similar. > If fabric, then my worry is always a panic'ed > admin clearing it without properly verifying the state of the lost node. > With watchdog, it's fine, just slow. > As it is last resort better slow than never. _______________________________________________ Users mailing list: [email protected] http://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
