Date: Tue, 24 Apr 2018 12:32:12 +0300 From: Mikhail Zakharov <zmey20000@yahoo.com> To: karli@inparadise.se Cc: "freebsd-fs@freebsd.org" <freebsd-fs@freebsd.org>, Mike Tancsa <mike@sentex.net> Subject: Re: ctl_isc_lun_sync: Received conflicting HA LUN Message-ID: <615DFFBB-239A-4350-B961-FD10D0C9A8DD@yahoo.com> In-Reply-To: <1524550160.1130.6.camel@inparadise.se> References: <4cb4aa83-bd49-0c20-4e41-c11c682b0570@sentex.net> <F908B78A-DD9B-4204-BA1E-24CE38059ACF@yahoo.com> <1e1e7cd5-0797-c168-fbce-a36edc6a432e@sentex.net> <1524550160.1130.6.camel@inparadise.se>
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Hi Karli, Thank you, I=E2=80=99m just exploring the storage abilities of my preferred O= S - FreeBSD.=20 Three nodes are preferable to choose the quorum for sure, but my idea was no= t to establish contacts between nodes. Instead of it, BQ uses a small partit= ion for the =E2=80=9Cquorum=E2=80=9D on the same space where data volume is l= ocated. 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 wr= ite stamps to the quorum partition. If for any reason BQ on one node detects= , the other node stops updating it=E2=80=99s stamps, it performs failover pr= ocedure. It=E2=80=99s quite a questionable, rude way, I can agree, and that=E2= =80=99s why I always write a warning to use the BeaST for testing only purpo= ses.=20 Best regards, Mike > 24 =D0=B0=D0=BF=D1=80. 2018 =D0=B3., =D0=B2 9:09, Karli Sj=C3=B6berg <karl= i@inparadise.se> =D0=BD=D0=B0=D0=BF=D0=B8=D1=81=D0=B0=D0=BB(=D0=B0): >=20 >> On Mon, 2018-04-23 at 13:11 -0400, Mike Tancsa wrote: >>> On 4/23/2018 12:59 PM, Mikhail Zakharov wrote: >>>=20 >>> Hello Mike, >>>=20 >>> 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=E2=80=99m on vacation right now. >=20 > [snip] >=20 > I read your articles on CTL HA, BQ and BeaST, and just wanted to say > they are amazing, good job! >=20 > One thing I=C2=B4m 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? >=20 > /K
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