Suggestion for installing 11gr2 crs with existing 10g crs...

Hi, I need suggestions on installing 1120 rac on suse 11 where already 10g rac with asm is running. I need to upgrade the 10g crs and asm while installing 11g crs. Pls share your experience on these
1- what are the challenges to run 10g database on 11gr2 crs? is this suggested?
2- challenges to upgrade asm and crs to 11gr2.
3- can we use 2 asm instance in 11g grid infra to manage 10g and 11g db separately.
4-what could be back strategy for this kind of setup? RMAN?
5-how many extra ip i need to install 11g crs with existing 10g crs . we plan to use 3 ip for scan.
Also if possible please share any doc for this kind upgrade
Thanks,
Abhai

1.) Yes this is o.k. Just see this MoS Note:
Pre 11.2 Database Issues in 11gR2 Grid Infrastructure Environment (Doc ID 948456.1)
2.) Well first only clusterware is upgraded. You will be asked if you want to upgrad ASM, but this is not mandatory at first.
You can use ASMCA later to switch ASM from 10.2 to 11.2 (this does not have to be done during upgrade).
3.) No you can only have 1 ASM running. So it is either 11.2 or 10.2 ASM. (However I suggest 11.2).
However you can/should have multiple diskgroups. One data and fra for the 11.2 databases where you set the rdbms.compatibility to 11.2 to use the new features, and one data an fra diskgroup for the 10.2 databases.
4.) As long as the compatibility setting of a diskgroup isn't changed, you can always switch ASM back to use 10.2 executables. (Just do a srvctl remove asm and add ASM).
Search this forum - there has been another thread about this.
Regarding fallback of clusterware => See installation guide.
5.) Mandatory are just 3 additional IPs for the SCAN.
Upgrade documentation see the installation guide of 11.2 GI.
Upgrade for ASM see Storage Admin Guide.
Upgrade to move OCR and Vote to ASM see Clusterware Admin Guide.
Upgrade to database see Database Upgrade Guide
Additionally look in MoS for the Upgrade Companion.
Sebastian

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