Hi all,
I am going to install oracle 12c R2 on OLE -7.5 in two node. I have install all pre required asm packages and created disks for disk group.
But on disk group creation stage following error occurred:

7 GB space is available in disk but it is still demanding 38 MB free space.I am able to create new disks, check status of existing disks using root and grid user.
[grid@node3 grid]$ oracleasm listdisks
DISK1
DISK2
DISK3
DISK4
[grid@node3 grid]$