INS-30508 Invalid ASM disks

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[FATAL] [INS-30508] Invalid ASM disks.

   CAUSE: The disks [/dev/xvdc8] were not valid.
   ACTION: Please choose or enter valid ASM disks.

Solution: Solution of  this problem is to provide valid ASM disks. You can provide ASM instance a valid ASM disks in following ways.

Solution1: Configure udev rules for raw devices and use them for ASM disk
#cd /etc/udev/rules.d
#vi 60-raw.rules
and add entry like this in 60-raw.rules. Make one entry for each disk

ACTION=="add", KERNEL=="xvdc9", RUN+="/bin/raw /dev/raw/raw9 %N"
ACTION=="add", KERNEL=="raw*", OWNER=="oracle", GROUP=="oinstall",MODE=="0660"

save and exit
Start Udev Service
# start_udev
Starting udev:                                             [  OK  ]


# udevadm control --reload-rules

# ls -ltr /dev/raw/raw9

crw-rw---- 1 oracle oinstall 162, 9 Dec 10 10:49 /dev/raw/raw9

Solution2: Configure ASMLib and configure ASM disks using asmlib

Follow the Instructions from Step by Step How to Install and Configure Oracle asmlib