Jason
Both instances can access the datafiles simultaneously. The DLM handles the
disk access issues. You can shutdown abort one instance and net8 will
redirect the calls to the surviving instance. For server based applications,
we mounted a 4GB disk to each machine, which runs local. On failure, the
logical IP's flip to the surviving node, and the application disks
automatically remount to the surviving node.
There is no significant delay when a node fails and the others must clean
up.
You must plan your application layouts carefully though.
Also consider load balancing : it is very annoying if you dont want to use
it.
Regards
Mark Teehan
Jason Wong <jaswong_at_mail.com> wrote in message
news:7ucv4m$el47_at_imsp212.netvigator.com...
> I am currently looking for a high availability database solution for one
of
> system. In my mind, I am planning to implement SUN Enterprise 4000 as the
> Servers, Oracle8i Parallel Server as the database engine, Veritas Cluster
> Server as the cluster manager and Clariion 5700 dual process RAID as the
> data storage.
>
> I want to have two instances of Oracle8i, that share the same database,
> running in 2 separate servers actively. So, when one of them shut down,
the
> other can take up the task immediately. I expect the down time to be less
> than 1 minute. However, some vendor told me that even with Oracle Parallel
> Server, two instances of Oracle8i that share the same database cannot be
> running actively at the same time. This is true because at any one time
the
> Cluster Server will allow only one server to mount on the disk volume.
Hence
> only one Oracle8i instance can access the database. When the primary
> Oracle8i is down, the secondary has to take 15 to 20 minute to initiate
the
> database.
>
> Is this true? Has anybody tried a similar setup? Please give me some
advise
> and tips.
>
> Thanks in advance!
>
> JasonWong
>
>
>
Received on Mon Oct 18 1999 - 07:11:11 CDT
