Why its failed on linux server? I tried to mark disk and got Fail!!!

[root@oradbserver3 Server]# /etc/init.d/oracleasm createdisk DISK1 /dev/sda2

Marking disk "DISK1" as an ASM disk:                       [FAILED]
You just need to do:

/etc/init.d/oracleasm start


.... to start off with.

Look at your screenshot - you completely ignored the fact that the oracleasm command gave you the command-line usage back, rather than actually doing anything.