Anton,
Anton Altaparmakov wrote:
Dear Steve,
Thank you very much for the quick reply!
On 11 Mar 2010, at 15:08, Steve Mckinty wrote:
You can't do this with AVS within a single cluster.
Ah!
You can setup two single-node clusters in a Geo Cluster configuration
and configure AVS replication between the two "sites".
Right, that sounds like what we want.
Well, do bear in mind that Geo Edition is a disaster recovery solution
that combines two clusters which are assumed to be significantly far
apart. By design the switchover is not automatic. It is automated, but
manually triggered, per normal DR practice. That may not be what you
need.
Could you by any chance point me in
the right direction of how I do that, please? (A link to an example
documentation would be wonderful!) And just to clarify, in this
configuration I will still be able to fail over from one cluster
to the other?
For the non-ZFS case, try:
http://docs.sfbay.sun.com/app/docs/doc/820-6218
We don't yet support ZFS in this configuration for production use,
it is still undergoing QA testing, but it works Ok in my lab.
Great, thanks! Now I just have to figure out how to do it...
Any guidance would be much appreciated! I have so far managed to
install the Sun Cluster Geographic edition on both machines. For
now I installed the quorum server on one of the machines, too
Since SC Geo links two independent clusters you don't need quorum
between them.
For ZFS use the main thing to remember is that you'll need to delete
the default disk-specific cluster device groups (format 'dsk/dN')
and create a named raw device group with the same name as the zpool
which contains all the devices in the pool. Then follow the guidelines
for setting up HAStoragePlus, in particular setting the ZpoolsSearchDir
property to /dev/did/dsk and using the same devices for the AVS replication.
*Please* bear in mind that this is *not* yet supported, no guarantees
that it will work correctly. By all means use it to prototype/test
but not in production. You will need the latest (3.2 11/09) release
as well.
though in service we would put the quorum server on a third site
(as we do with our heartbeat v2 setup at the moment). But I haven't
gotten anywhere with configuring them as all commands seems to need
to be pointed at shared storage for storing their state and the
whole point of our set up is that there is no shared storage anywhere
in the system.
I'm curious about why shared storage isn't possible, since even a
simple two-port SCSI disk can be used for that. Can you expand a
little?
It's a model that we have had requests for in the past. Hartmut's
suggestion about using iSCSI is also a possible route, by using iSCSI
targets on each host exported to the other host. Looks like shared
storage, but isn't. I don't know what the support status of that is.
Are you planning on using this in production, or just for internal testing?
You could also go to the opensolaris.org site and look in the HA community.
If you search for posts by Marcelo Leal you'll find his AVS agent which
he developed to use with AVS *inside* a single 2-node cluster. It's a user
supplied agent for Open HA cluster, so obviously isn't usable in a configuration
where formal support would be required. It might be useful if you're just
doing internal test/experimentation.
Regards
Steve
Thanks a lot in advance for any further help you can give me!
Best regards,
Anton
Steve
Anton Altaparmakov wrote:
Hi,
I have been trying to setup Solaris Storage AVS with Sun Cluster in the hope of
having a ZFS file system replicated synchronously (via TCP/IP only) between two
machines so that it is mounted on one machine read-write and if that machine
fails it is mounted read-write on the other machine.
I have been reading all sorts of documentation and man pages and experimenting
but everything I have tried immediately asks for configuration of shared
storage which we don't have as the two machines are only connected by TCP/IP.
We have such a system running at the moment using Linux, iSCSI plus software
raid for the replication and XFS as the file system and heartbeat v2 for the
failover and that works well. We then have an NFS server which exports the XFS
file system and the NFS server is migrated together with the service ip address
and the XFS file system between the two nodes in the heartbeat cluster but I
have now spent ages trying to figure out what to do with Sun Cluster and AVS to
achieve the same and I am completely failing to do it. )-: Would someone,
pretty please with sugar on top, point me at the documentation I am failing to
find or alternatively giving me some pointers as to which commands it is I
should be using?
Thank you very much in advance!
Best regards,
Anton
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