Re: additional feature for monit-3.0 (for clusters)

[Oliver Jehle]

Most clusters i've seen are simple 2 node clusters without any quorum :-)
but if you need a qorum, you can do it with a simple script... and for example
ping,
or scsi-ping or something like that and then calculate your quorum numbers and
decide,
if the services should be started...




Martin Pala wrote:

> ----- Original Message -----
> From: "Oliver Jehle" <address@hidden>
> To: <address@hidden>
> Sent: Tuesday, October 29, 2002 9:57 AM
> Subject: Re: additional feature for monit-3.0 (for clusters)
>
> > with this change (and my changes) and hearbeat, i think we have to
> > possibility to build clusters with the
> > same functionality like tru-cluster (HP/Compaq) or SUN with the
> Sun-Cluster
> > software... they offer perhaps
> > some enhancement like auto-take-over of disks and filesystems, but it's a
> > small script to import a vg and mount
> > a filesystem...
> >
>
> It will lack some features of mentioned cluster solutions (such as
> trucluster, suncluster, etc.) - one of biggest issues will be
> split-brain-problem. It is often managed by quorum (majority princip) and
> this feature monit+heartbeat based cluster will not have. I thing it will
> not be big problem, while this simple cluster can have its place
> (non-critical apps) - in the case of mentioned special case problems oprator
> can simply repaire such state. When the user will more robust solution,
> he/she can use some other free solutions such as SSI, kimberlite, etc.
>
> Martin
>
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