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They wouldn't be two disks...it would be the one disk.
They are not a copy of each other...they are the same physical device/LUN.
You would utilise the raw device (ie rdisk) for ASM.
If you were to format the disk for filesystems you would be using the /dev/disk device.
It is my opinion that it is absolutely essential that if you are going use ASM or RAC, that the DBA ***MUST*** learn system, network and SAN administration duties so that you actually understand how your system is configured.
You were actually only given ONE disk (disk13), You will want to make sure that you partition off the first cylinder and use a partition that contains cylinders 2-last. If you do not understand this terminology, please have your sys admin assist. You would then actually use /dev/rdisk/disk13p1 (or whatever partition number they gave you). Make sure that ALL disks are EXACTLY the same size and NEVER have the SAN "extend/expand" the device. Since the SAN is using RAID5, you can use EXTERNAL REDUNDANCY.
Thank you very much for you reply.
So, here same disk is being shown in two disfferent directories for different purposes.
Can you give me some link for good study material where I can learn "system administration for DBAs"