Do we have any alternate logic /Command to find out the disk ownership than disk show -a..?.
In our environment,after replacing the failed disk the disk become unowned.I am aware that we can find out using a previous autosupport.However i am been very curious to get the things out without referring the old config...
No. Disk has not "became" unowned - disk is not owned as long as it is not assigned. Ownership is physical disk property, not specific slot property. Whoever replaces the disk is responsible for assigning it to correct controller.
NetApp supports automatic disk assignment (which is default) but it requires that the whole loop (stack) is owned by single controller.
I do not think there is any way to find this information. Even failed disk registry does not list disk slot after it has been removed.
If filer sends ASUP to NetApp, you can try to open support case. ASUPs are kept for a long time, if not forever (someone from NetApp please correct me), so support guys may be able to pull information from half year old ASUP.