[ClusterLabs] Fencing with a 3-node (1 for quorum only) cluster
lists at alteeve.ca
Fri Aug 5 00:08:45 EDT 2016
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
Yup. That would be fabric fencing though, or are you talking about using
it under watchdog timers? 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.
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