Re: suggestions re. cluster configuration

Yup there is virtually no difference between DRBD and DRBD-SSI except
for the fact that only DRBD-SSI supports CFS failover in OpenSSI.  So
you can go to the DRBD user community and see what kind of DRBD
mirroring they have done and do the same with DRBD-SSI here.  You'd
want to use the built-in features of OpenSSI instead of heartbeat to
manage the availability of your applications.

OpenSSI supports up to 128 nodes per cluster, so you even can do more
complex DRBD setups with OpenSSI like run two separate pairs of
DRBD-SSI nodes in a four node cluster or three DRBD-SSI pairs in a six
node OpenSSI cluster and so on.  I myself haven't tested running two
DRBD clusters within a four node OpenSSI cluster, but theoretically
the code is there in DRBD-SSI to support these kinds of
configurations.

Roger


On 7/7/06, Miles Fidelman <[email protected]> wrote:
> One thing I'm wondering about is doubling up the mirrors:  I've got 4
> drives on each server, so what I'd like to do is:
> - mirror pairs of drives on each server
> - mirror each pair, using drbd with a matching pair on the other server
>
> That way, if one server goes down, all the data is still mirrored.
>
> Anybody try a setup like this?
>
> Thanks,
>
> Miles
>
> Roger Tsang wrote:
> > Also you don't need heartbeat in OpenSSI.  If you want active/active
> > cluster without external storage OpenSSI+DRBD is the way to go versus
> > just DRBD+heartbeat.  I wouldn't imagine too many people doing
> > active/active setups using DRBD without OpenSSI.  CFS failover is much
> > more elegant.  Plus if CPU is the bottleneck in your application you
> > can always add more nodes to your OpenSSI+DRBD cluster.
> >
> > Roger
> >
> > On 7/7/06, Christopher Hawkins <[email protected]> wrote:
> >
> >> For a two node HA cluster, I think the simplest way would be heartbeat and
> >> DRBD. That would give you a single service IP address and data mirroring. In
> >> my experience with this config, you can get failover in just a few seconds
> >> if the primary node dies. There are lots of ways to make it more complex...
> >> Xen, etc., but that might just be making it harder than it needs to be.
> >>
> >> Chris
> >>
> >> -----Original Message-----
> >> From: [email protected]
> >> [mailto:[email protected]] On Behalf Of Miles
> >> Fidelman
> >> Sent: Friday, July 07, 2006 1:51 PM
> >> To: [email protected]
> >> Subject: [SSI-users] suggestions re. cluster configuration
> >>
> >> Hi,
> >>
> >> I'm wrestling with possible configurations for a 2-node, high availability
> >> cluster.
> >>
> >> What I seem to be zeroing in on is:
> >> - using Xen to provide several virtual servers on each box
> >> - using md to raid together the disks on each server
> >> - using DRBD to mirror the primary machine to the backup server
> >> - using EVMS to manage partitions and such
> >> - using SSI to provide a single interface to the world for each pair of
> >> virtual servers
> >>
> >> Anybody have any experience with this kind of setup? Any suggestions,
> >> pointers to recipes, etc.?
> >>
> >> Thanks much,
> >>
> >> Miles Fidelman
> >>
> >> Using Tomcat but need to do more? Need to support web services, security?
> >> Get stuff done quickly with pre-integrated technology to make your job
> >> easier Download IBM WebSphere Application Server v.1.0.1 based on Apache
> >> Geronimo
> >> http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642
> >> _______________________________________________
> >> Ssic-linux-users mailing list
> >> [email protected]
> >> https://lists.sourceforge.net/lists/listinfo/ssic-linux-users
> >>
> >>
> >> Using Tomcat but need to do more? Need to support web services, security?
> >> Get stuff done quickly with pre-integrated technology to make your job easier
> >> Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
> >> http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642
> >> _______________________________________________
> >> Ssic-linux-users mailing list
> >> [email protected]
> >> https://lists.sourceforge.net/lists/listinfo/ssic-linux-users
> >>
> >>
> >
> > Using Tomcat but need to do more? Need to support web services, security?
> > Get stuff done quickly with pre-integrated technology to make your job easier
> > Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
> > http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642
> > _______________________________________________
> > Ssic-linux-users mailing list
> > [email protected]
> > https://lists.sourceforge.net/lists/listinfo/ssic-linux-users
> >
>
>
> Using Tomcat but need to do more? Need to support web services, security?
> Get stuff done quickly with pre-integrated technology to make your job easier
> Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
> http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642
> _______________________________________________
> Ssic-linux-users mailing list
> [email protected]
> https://lists.sourceforge.net/lists/listinfo/ssic-linux-users
>

Using Tomcat but need to do more? Need to support web services, security?
Get stuff done quickly with pre-integrated technology to make your job easier
Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642