The "spare SC" feature is actually about making it possible to configure more than two system controller, so it is not primarily about improving split-brain detection. However, we implemented some improvements in the split-brain detection and recovery as part of this feature for the simple reason that the risk for split-brain is higher when you have more system controller nodes.
The split-brain recovery mechanism is very simple in OpenSAF 5.0, but I believe it will detect and recover from the situation you describe. If it is not enough, you can also try the remote fencing mechanism that was added in OpenSAF 5.1. There are plans to improve this further in future versions of OpenSAF, by using quorum and arbitration mechanisms. regards, Anders Widell On 12/01/2016 09:18 PM, Nivrutti Kale wrote: > > Hi Anders, > > I have gone through the “Spare SC” feature documentation. I am not > able to understand how Spare SC feature will help in this case? > > In my case, there is a connectivity loss between 2 physical servers > which results into 2 opensaf cluster. > > Now when the connectivity is restored, there is no way to restore the > original state. > > Thanks, > > Nivrutti > > *From:*Anders Widell [mailto:anders.wid...@ericsson.com] > *Sent:* Thursday, December 01, 2016 6:02 PM > *To:* Nivrutti Kale <nk...@brocade.com>; > opensaf-users@lists.sourceforge.net > *Subject:* Re: [users] Both controllers Active > > No, the "spare SC" feature was introduced in OpenSAF 5.0 and doesn't > exist in earlier versions of OpenSAF. > > regards, > > Anders Widell > > On 12/01/2016 01:24 PM, Nivrutti Kale wrote: > > Thanks for the response Anders. > > We are using opensaf 4.5. > > Is this feature not available in 4.5? > > Thanks, > > Nivrutti > > *From:* Anders Widell [mailto:anders.wid...@ericsson.com] > *Sent:* Thursday, December 01, 2016 5:48 PM > *To:* Nivrutti Kale <nk...@brocade.com> > <mailto:nk...@brocade.com>; opensaf-users@lists.sourceforge.net > <mailto:opensaf-users@lists.sourceforge.net> > *Subject:* Re: [users] Both controllers Active > > Which version of OpenSAF are you using? A simple split-brain > detection and recovery mechanism was added as part of the "spare > SC" feature in OpenSAF 5.0. > > regards, > > Anders Widell > > On 12/01/2016 09:49 AM, Nivrutti Kale wrote: > > Hi All, > > > > In my opensaf cluster there are 2 controllers and 8 payloads (10 VMs) > on two physical servers. 1 Controller and 4 payload resides on one physical > server each. > > There is a connectivity loss between 2 physical servers which results > into 2 different opensaf cluster with 2 Active controllers. > > > > After some time connectivity is restored between 2 physical servers. > Still there are 2 opensaf clusters with 2 Active Controllers. > > Is there any parameter in opensaf which will auto-recover the state > of the opensaf cluster to normal. i.e 1 Active Controller and 1 Standby > controller with 8 payloads in single opensaf cluster. > > > > Thanks, > > Nivrutti Kale > > Manager, Software Engineering, Mobile Networking R&D > > Brocade > > Mumbai, India > > M. +91 9503023209 > > > [http://intranet.brocade.com/Marketing/PublishingImages/brocade_email_signature.gif] > > > > > > > > > ------------------------------------------------------------------------------ > > > > _______________________________________________ > > Opensaf-users mailing list > > Opensaf-users@lists.sourceforge.net > <mailto:Opensaf-users@lists.sourceforge.net> > > https://lists.sourceforge.net/lists/listinfo/opensaf-users > > <https://urldefense.proofpoint.com/v2/url?u=https-3A__lists.sourceforge.net_lists_listinfo_opensaf-2Dusers&d=DgMC-g&c=IL_XqQWOjubgfqINi2jTzg&r=qssxjGQZARrEa_Yax-32kXOgWL2XHZgOPUvhIFaqP1k&m=89lj_FWtizgPI0LECfAA4FcKq_o-IRr4GaVpM0eMzKY&s=G3LSNLTwt_e1DJLUZaQvg6LrWC0TrCI4u8keSYorpwk&e=> > ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, SlashDot.org! http://sdm.link/slashdot _______________________________________________ Opensaf-users mailing list Opensaf-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/opensaf-users
