ctl_isc_lun_sync: Received conflicting HA LUN

[Karli Sjöberg]

On Tue, 2018-04-24 at 13:00 +0200, Karli Sjöberg via freebsd-fs wrote:
> On Tue, 2018-04-24 at 12:32 +0300, Mikhail Zakharov wrote:
> > Hi Karli,
> > 
> > Thank you, I’m just exploring the storage abilities of my preferred
> > OS - FreeBSD. 
> > 
> > Three nodes are preferable to choose the quorum for sure, but my
> > idea
> > was not to establish contacts between nodes. Instead of it, BQ uses
> > a
> > small partition for the “quorum” on the same space where data
> > volume
> > is located. 
> 
> Yes, of course. But there´s nothing you from having three nodes

's/nothing you/nothing stopping you/'

> connected to the same partition and being able to make more accurate
> choices on when to take over?
> 
> If one node stops updating stamps, take over. If two nodes stops
> updating, then the problem is likely network-related and _must not_
> take over to avoid split brain. Something like that?
> 
> /K
> 
> > And if a node looses access to the quorum it means, it looses
> > access
> > to the data volume too. Now, BQ runs on both nodes and both BQ
> > instances write stamps to the quorum partition. If for any reason
> > BQ
> > on one node detects, the other node stops updating it’s stamps, it
> > performs failover procedure. It’s quite a questionable, rude way, I
> > can agree, and that’s why I always write a warning to use the BeaST
> > for testing only purposes. 
> > 
> > Best regards,
> > Mike
> > 
> > > 24 апр. 2018 г., в 9:09, Karli Sjöberg <karli at inparadise.se>
> > > написал(а):
> > > 
> > > > On Mon, 2018-04-23 at 13:11 -0400, Mike Tancsa wrote:
> > > > > On 4/23/2018 12:59 PM, Mikhail Zakharov wrote:
> > > > > 
> > > > > Hello Mike,
> > > > > 
> > > > > Thank you for your interest to my paper. I appreciate it very
> > > > > much!
> > > > > Your error may be a consequence of the initial HA
> > > > > misconfiguration.
> > > > > What is in your /boot/loader.conf? Although the described
> > > > > config is
> > > > > quite simple, I can recheck the instruction in my paper in a
> > > > > couple
> > > > > of weeks only, unfortunately I’m on vacation right now.
> > > 
> > > [snip]
> > > 
> > > I read your articles on CTL HA, BQ and BeaST, and just wanted to
> > > say
> > > they are amazing, good job!
> > > 
> > > One thing I´m wondering about though is if you can claim HA with
> > > just
> > > two nodes, usually you need at least three, where the third is a
> > > tie-
> > > breaker. Otherwise with your current setup, both systems may
> > > loose
> > > contact with each other while both still being powered on,
> > > leading
> > > to
> > > potential split brain situations. What are your thoughts about
> > > that?
> > > 
> > > /K
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