[Linux-cluster] A few GFS newbie questions: journals, etc
Patrick Caulfield
pcaulfie at redhat.com
Mon Jun 27 06:42:23 UTC 2005
Nate Carlson wrote:
> On Fri, 24 Jun 2005, Lon Hohberger wrote:
>
>> Yes, as long as more than half the VMs were on the surviving node as
>> well...
>>
>> If exactly half of the nodes votes disappear, a quorum no longer
>> exists (except in the 2-node special case). Suppose there were 4 VMs:
>>
>> 2 x 50 votes = 100 votes
>> 4 x 1 vote = 4 votes
>> Total = 104 votes
>> ---------------------------
>> Need for quorum = 53 votes
>
>
> Is it possible to tweak the votes needed for quorum with
> 'expected_votes'? I've been playing with it a bit, and it seems to work.
Yes, you can force expected_votes to be an unreasonable low value. Personally I
set it to 1 on my single-machine Xen test cluster but then I don't care about
data corruption ;-)
> Really, in my case, as long as one of physical hosts is still up, I'd
> still like to have a quorum.
>
--
patrick
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