Hi,
I addition to Kedar's explaination, If HA is required for DAS, it can
be achieved in following two ways
(snippet from Nazrul's blog
<
http://blogs.sun.com/nazrul/entry/under_the_hood_of_glassfish>)
/DAS/ has no role in application runtime functionality. So, when /DAS/
is un-available, the cluster will continue to run. You may use /%asadmin
backup-domain
<
http://docs.sun.com/app/docs/doc/819-4736/6n6s9pj18?a=view>/ command to
create a backup of /DAS/. After that, please backup the zip from
/backup-domain/ command in a highly available storage. When /if /DAS/'s
machine crashes, you may use /%asadmin restore-domain
<
http://docs.sun.com/app/docs/doc/819-4736/6n6s9pj7k?a=view>/ command
with the previously backed-up zip to restore the domain in another
machine. During /DAS/'s startup, it will ping all the /node agents/ to
notify the new co-ordinates of /DAS/. Solaris [Sun] Cluster
<
http://www.sun.com/software/solaris/cluster/index.xml> has support for
Sun Java System Application Server
<
http://www.sun.com/software/products/appsrvr/index.xml>. You may use it
to provide automatic failover. Refer to this documentation
<
http://docs.sun.com/app/docs/doc/817-7000/6mmbndqgp?a=view> for more
details.
Thanks,
Gopal*
*glassfish_at_javadesktop.org wrote:
>What good are clusters using instances on different physical servers if the server that houses the DAS central repository goes down? Is the DAS central repository supposed to be running on multiple servers (or is this even possible)?
>
>Based on my limited understanding, if the DAS server goes down, the entire Glassfish configuration (domain) is down, including a cluster with instances running on different physical servers. What am I missing?
>
>Thanks
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