[Linux-HA] ipfail in V2

Andrew Beekhof beekhof at gmail.com
Thu Oct 20 09:14:42 MDT 2005


On 10/20/05, Alan Robertson <alanr at unix.sh> wrote:
> Andrew Beekhof wrote:
> > On 10/20/05, Lars Marowsky-Bree <lmb at suse.de> wrote:
> >>On 2005-10-20T13:22:30, Simon Rowe <srowe at cambridgebroadband.com> wrote:
> >>
> >>>>(OK, or wait for someone on the linux-ha team to write it.)
> >>>I don't have the time for either. I'll have to dump V2 and see if V1
> >>>provides sufficient working functionality.
> >>I suppose this being Open Source, you could find a developer who'd take
> >>a bribe and implement this feature for you for less than you'd have paid
> >>for a single node license of a commercial clustering product...
> >
> > While in principle I personally would never take bribes, in practice I
> > have no principles :-)
> >
> > With what we have now in CVS, we can get a reasonably close
> > approximation of ipfail.
> > You wont get true damping - so some ping-pong'ing of resources may still occur.
> > It may also be not as efficient as we'd like it to be.
> >
> > lmb: random thought... if the "ipfail RA" checked the values on the
> > other nodes before it updated the CIB, then we could avoid dipping
> > into the PE.  the check would be trivial, just specify a different
>
> Writing the code to do this is not trivial...
>
>
> Let's see ... you need to write a join protocol, and then you need to
> exchange votes with everyone else, and...
>
> Right now, they have NO communication with other nodes at all.

you dont need any of that.  query the CIB:

crm_attribute -G -U some_host -n the_attribute -t nodes

>
>
> --
>      Alan Robertson <alanr at unix.sh>
>
> "Openness is the foundation and preservative of friendship...  Let me
> claim from you at all times your undisguised opinions." - William
> Wilberforce
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>



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