Can someone explain to me (like I'm five) what I LUN is and what a logical unit is? I've read explanations in the DCICN OCG (Official Cert Guide) book and resources on line, but it's just not clicking what these really are. It seems like a LUN can be a part of a drive or multiple drives, but not 100% sure. And I really don't have a good grasp of what a logical unit is (in respect to LUNs).
Exactly as Mark said, a LUN is basically a virtual disk. The LUN ID is just the identifier that you can then use to present it to a server.
In a SAN environment, you use RAID for disk parity (protecting against disk failure) and to create a big disk group. Its on top of this RAID disk group that you can create LUNs. You typically take those LUNs and present them via Fibre Channel or iSCSI to a server. That server thinks the LUN is a real locally-attached disk.
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