Existing ASM disk resize steps

ASM DISK RESIZE FAILS FOR OS DEVICES GROWN AFTER ASM INSTANCE START-UP

 DATA_DG disk group having 25GB  , Request is to increase DATA_DG disk group to to 100Gb.DATA_DG have only one disk i.e DATA01 and plan is to increase existing disk only DATA01

Step 1 : Storage level existing storage needs to be increased to 100GB ( 25gb already available , need to add another 75gb).

Step 2 : Os level , shared disk disk partition needs to be updated.

fdisk -l /dev/sdc  ( 25GB showing).

delete partition using d option and create new partition using  new size.

the sequence of answers is "n", "p", "1", "Return", "Return", "p" and "w".

Step 3 : As a root user , execute oracleasm scandisks 

Step 4 : restart ASM services in rolling fashion.

step 5 : Increase disk size to new value.

alter diskgroup DATA_DG resize disk DATA01 size 100000m ;

100GB.