Hi, I want to combine all the above mentioned technologies. The Linbit pages warn not to use the drbd: VBD with HVM DomUs. This page however: http://publications.jbfavre.org/virtualisation/cluster-xen-corosync-pacemaker-drbd-ocfs2.en (thank you Jean), simply puts two DRBD devices in dual primary mode and starts Xen DomUs while pointing to the DRBD devices with phy: in the DomU config files. Live migration and HVM seem possible. Is it as simple as Jean describes it? What is the advantage then of the drbd: VBD? Just seeing to it that the dual primary is available? Thx! B. _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Hi, Using the DRBD VBD backend over simply using PHY has one main advantage. If you are using drbd: you don''t need to have the system contstantly in dual-primary mode, which can cause data corruption and increases the chances of a split brain event occuring in a network segregation senario. If you are fine using allow-dual-primary and become-primary-on: both then it no longer makes any difference. Joseph. On 11 May 2011 01:05, Bart Coninckx <bart.coninckx@telenet.be> wrote:> Hi, > > I want to combine all the above mentioned technologies. > > The Linbit pages warn not to use the drbd: VBD with HVM DomUs. > > This page however: > > http://publications.jbfavre.org/virtualisation/cluster-xen-corosync-pacemaker-drbd-ocfs2.en > > (thank you Jean), simply puts two DRBD devices in dual primary mode and > starts Xen DomUs while pointing to the DRBD devices with phy: in the DomU > config files. > Live migration and HVM seem possible. > > Is it as simple as Jean describes it? What is the advantage then of the > drbd: VBD? Just seeing to it that the dual primary is available? > > > Thx! > > > B. > > _______________________________________________ > Xen-users mailing list > Xen-users@lists.xensource.com > http://lists.xensource.com/xen-users >-- Kind regards, Joseph. Founder | Director Orion Virtualisation Solutions | www.orionvm.com.au | Phone: 1300 56 99 52 | Mobile: 0428 754 846 _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Hi Jospeh, that''s indeed what I figured. The Pacemaker cluster software should take care of avoiding split brains. I will need to convince certain people of investing into a STONITH device. B. On 05/11/11 06:09, Joseph Glanville wrote:> Hi, > > Using the DRBD VBD backend over simply using PHY has one main advantage. > > If you are using drbd: you don''t need to have the system contstantly > in dual-primary mode, which can cause data corruption and increases > the chances of a split brain event occuring in a network segregation > senario. > If you are fine using allow-dual-primary and become-primary-on: both > then it no longer makes any difference. > > Joseph. > > On 11 May 2011 01:05, Bart Coninckx<bart.coninckx@telenet.be> wrote: >> Hi, >> >> I want to combine all the above mentioned technologies. >> >> The Linbit pages warn not to use the drbd: VBD with HVM DomUs. >> >> This page however: >> >> http://publications.jbfavre.org/virtualisation/cluster-xen-corosync-pacemaker-drbd-ocfs2.en >> >> (thank you Jean), simply puts two DRBD devices in dual primary mode and >> starts Xen DomUs while pointing to the DRBD devices with phy: in the DomU >> config files. >> Live migration and HVM seem possible. >> >> Is it as simple as Jean describes it? What is the advantage then of the >> drbd: VBD? Just seeing to it that the dual primary is available? >> >> >> Thx! >> >> >> B. >> >> _______________________________________________ >> Xen-users mailing list >> Xen-users@lists.xensource.com >> http://lists.xensource.com/xen-users >> > > >_______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Hi. Yes Corosync and Pacemaker are perfect for the task. USB STONITH devices are cheap and effective. Goodluck with your configuration. :) Joseph. On 13 May 2011 04:40, Bart Coninckx <bart.coninckx@telenet.be> wrote:> Hi Jospeh, > > that''s indeed what I figured. The Pacemaker cluster software should take > care of avoiding split brains. I will need to convince certain people of > investing into a STONITH device. > > > B. > > > On 05/11/11 06:09, Joseph Glanville wrote: >> >> Hi, >> >> Using the DRBD VBD backend over simply using PHY has one main advantage. >> >> If you are using drbd: you don''t need to have the system contstantly >> in dual-primary mode, which can cause data corruption and increases >> the chances of a split brain event occuring in a network segregation >> senario. >> If you are fine using allow-dual-primary and become-primary-on: both >> then it no longer makes any difference. >> >> Joseph. >> >> On 11 May 2011 01:05, Bart Coninckx<bart.coninckx@telenet.be> wrote: >>> >>> Hi, >>> >>> I want to combine all the above mentioned technologies. >>> >>> The Linbit pages warn not to use the drbd: VBD with HVM DomUs. >>> >>> This page however: >>> >>> >>> http://publications.jbfavre.org/virtualisation/cluster-xen-corosync-pacemaker-drbd-ocfs2.en >>> >>> (thank you Jean), simply puts two DRBD devices in dual primary mode and >>> starts Xen DomUs while pointing to the DRBD devices with phy: in the DomU >>> config files. >>> Live migration and HVM seem possible. >>> >>> Is it as simple as Jean describes it? What is the advantage then of the >>> drbd: VBD? Just seeing to it that the dual primary is available? >>> >>> >>> Thx! >>> >>> >>> B. >>> >>> _______________________________________________ >>> Xen-users mailing list >>> Xen-users@lists.xensource.com >>> http://lists.xensource.com/xen-users >>> >> >> >> >-- Kind regards, Joseph. Founder | Director Orion Virtualisation Solutions | www.orionvm.com.au | Phone: 1300 56 99 52 | Mobile: 0428 754 846 _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users