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I have accidentally dropped partitions from existing storage. (ASM Disks)You have just dropped the partitions so there are chances to recover it by using partition recovery tools like [url http://www.howtoforge.com/data_recovery_with_testdisk]TestDisk. But when I check testdisk, I did not found RHEL support for it. So try to find out how to recover dropped partition in RHEL with a good and proved tool. Because I hope you can recover it, you didn't formatted the space it, just dropped the partition, so it only changes the partition table, data is there for sure.
I agree with others, without a backup, recovery is going to be problematic.
There are recovery services available, that can recover even badly damaged databases, for a fee.
One example of such a service can be found at: http://www.ora600.be/
(Full disclosure, the company mentioned above is owned by my friend, Kurt Van Meerbeeck.)
Finally, I'll just mention that datapump exports are not, and should not be, considered backups!