Zero padding the LUN using dd command in Linux

Grid Infrstructure: 11.2.0.3
OS : Oracle Enterprise Linux 6.3
When we were installing RAC in solaris, we used to zero pad all LUNs meant for ASM . We used to do like below
dd if=/dev/zero of=/dev/rdsk/c0t600A0B8008A4CA005ACd0s0 bs=1024k count=2000Now we are going to install RAC in Oracle Linux v6 . When I googled Linux related stuff for RAC , I didn't come across documents in which zero padding is done on LUNs meant for ASM Disk groups.
Question1. Is zero padding using dd necessary in Linux platform ?
Question2. If dd command has to be run in the LUN, shouldn't that be done before we create the partition table ?

Question1. Is zero padding using dd necessary in Linux platform ?No, never did that, not even on Solaris.
Question2. If dd command has to be run in the LUN, shouldn't that be done before we create the partition table ?Of course it should.
What would be the point of creating the partition table and after that overwriting it with 0-s :)
Do you use a NAS for ASM disks?
Solaris: http://docs.oracle.com/cd/E11882_01/install.112/e24616/storage.htm#CACDHHJJ
Linux: http://docs.oracle.com/cd/E11882_01/install.112/e22489/storage.htm#CFACJAGB

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