Date: Tue, 24 Apr 2018 13:04:02 +0200 From: Karli =?ISO-8859-1?Q?Sj=F6berg?= <karli@inparadise.se> To: Mikhail Zakharov <zmey20000@yahoo.com> Cc: "freebsd-fs@freebsd.org" <freebsd-fs@freebsd.org> Subject: Re: ctl_isc_lun_sync: Received conflicting HA LUN Message-ID: <1524567842.9560.66.camel@inparadise.se> In-Reply-To: <1524567621.9560.65.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> <615DFFBB-239A-4350-B961-FD10D0C9A8DD@yahoo.com> <1524567621.9560.65.camel@inparadise.se>
next in thread | previous in thread | raw e-mail | index | archive | help
--=-PWWqx37QHYO2cefLF1q8 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2018-04-24 at 13:00 +0200, Karli Sj=C3=B6berg via freebsd-fs wrote: > On Tue, 2018-04-24 at 12:32 +0300, Mikhail Zakharov wrote: > > Hi Karli, > >=20 > > Thank you, I=E2=80=99m just exploring the storage abilities of my prefe= rred > > OS - FreeBSD.=20 > >=20 > > 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 =E2=80=9Cquorum=E2=80=9D on the same space wher= e data > > volume > > is located.=20 >=20 > Yes, of course. But there=C2=B4s 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? >=20 > 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? >=20 > /K >=20 > > 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=E2=80=99s stamps,= it > > performs failover procedure. It=E2=80=99s quite a questionable, rude wa= y, I > > can agree, and that=E2=80=99s why I always write a warning to use the B= eaST > > for testing only purposes.=20 > >=20 > > Best regards, > > Mike > >=20 > > > 24 =D0=B0=D0=BF=D1=80. 2018 =D0=B3., =D0=B2 9:09, Karli Sj=C3=B6berg = <karli@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 --=-PWWqx37QHYO2cefLF1q8 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: This is a digitally signed message part Content-Transfer-Encoding: 7bit -----BEGIN PGP SIGNATURE----- iQEcBAABCAAGBQJa3w8iAAoJEBpo164N2cuRlWUIAIBoZTRb3CxKi9My7V+3+2Ca Wac9y1RvOpKAyUo77s+bvUhkfxMeHyFXUkRsvlVbW9rZqWSPYO4GfLAi4EBYMxYL O1PVt7Ks+0ASGbaL2ztGtoaqOuXCRkUl81YYdtO8loEGC1ipKs41FZjSdhV80z9K o1PvQ2T8/Jgq+inpzc1fNfvadgMO69VjiVCJo/lDk/FJhTQUwyADOUsXOiSdcP2z dxp8PtJPmm/h73MvctOgwT1JmkcpG6UDecPqF2ZINH2usxAdIrzuAVTnsQb+KxLg r3WP9/uay4KonceUiesErTLBfA3slTCjJN3dR82ujKw2mQXs9Y5czZOy15W23VM= =vuBA -----END PGP SIGNATURE----- --=-PWWqx37QHYO2cefLF1q8--
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?1524567842.9560.66.camel>