You should first determine which Patches/Firmwares are necessary to apply.
For that, check the recent Sun Alterst like
http://sunsolve.sun.com/search/document.do?assetkey=1-26-102775-1&searchcla use=
http://sunsolve.sun.com/search/document.do?assetkey=1-26-102617-1&searchcla use=
http://sunsolve.sun.com/search/document.do?assetkey=1-26-102788-1&searchcla use=
there might be others. Consult
http://sunsolve.sun.com/search/search.do?collection=SUNALERT&max=100
for a recent list.
Then you need to follow the documented procedure for Sun Cluster like
http://docs.sun.com/app/docs/doc/819-2971/6n57mi2dh?a=view
And review each Patch README. E.g. Patch 121208-03 on S10 needs to applied
in single-user mode and needs an immediate reboot afterwards.
So make sure to review all information and then create a plan to your specific configuration.
Hope this helps.
Greets
Thorsten
Forgot to mention the main page on the DST topic:
http://www.sun.com/dst
and specificly:
http://www.sun.com/bigadmin/hubs/dst/software/#Solaris_Cluster_Sun_Cluster_
Of course, as mentioned in my previous post, you need to analyse the whole stack of hadrware/software in use in order to determine the action plan.
Greets
Thorsten