First, logon one of Oracle VM servers (OVS) to identify which mount point is the repository which is the destination that we want to upload ISOs.
[root@ovs1 ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda2 35G 1.6G 31G 5% /
tmpfs 376M 0 376M 0% /dev/shm
/dev/sda1 477M 85M 363M 19% /boot
none 376M 40K 376M 1% /var/lib/xenstored
/dev/mapper/36589cfc000000ffa1a4d259e49a77dce
17G 263M 17G 2% /poolfsmnt/0004fb000005000013968b48f5e4246e
/dev/mapper/36589cfc000000528045d4f45a9014579
180G 6.7G 174G 4% /OVS/Repositories/0004fb0000030000fc533cb8750589e2
Open the console on the client side and upload the ISO to the destination.
> sftp root@ovs1
Connected to 10.68.17.72.
sftp> cd /OVS/Repositories/0004fb0000030000fc533cb8750589e2/ISOs/
sftp> put OracleLinux-R6-U6-Server-x86_64-dvd.iso
...
sftp> quit
Now, you can check the newly uploaded ISO on OVMM.