U have to give the path of asm disks manually when installing 11g grid Infrastructure
click Disk discovery path and then write
/dev/oracleasm/disks
automatically asm disks will be showned on list.And dont forget to check owner of disks they should belong to oracle:oinstall..
then edit /etc/sysconfig/oracleasm and add dm,sd parameters otherwise u can have a trouble with disks after restarting server.(if you are using multipath.)
ORACLEASM_SCANORDER="dm"
ORACLEASM_SCANEXCLUDE="sd"
last thing, dont forget to restart oracleasm
/etc/init.d/oracleasm restart.
after these steps are done simply run rootcrs.pl -verbose -deconfig -force on first node , if u have more than two nodes then u have to add -verbose. good luck.
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