ASM2.asm:SQL> ORA-29760: instance_number parameter not specified
where it starts fine with sqlplus on node-2 without any issue.
to further troubleshhot turn on the srvctl trace
now issue the same command
srvctl start asm -n
clearly evident that it is using spfile which was stored from the previous run and the spfile has
some wrong configuration. so made the below changes in the
1) add these is pfile with other memory parameters
cluster_database = TRUE
2) start the asm instance and recreate the spfile
3) shutdown and point the spfile in the pfile
4) try with srvctl now
Now all is gud
my both ASM instances came back fine using srvctl ..