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How does a LUN relate to notation CxTxDxSx?

In a Unix environment, how does a LUN relate to the controller naming convention of CxTxDxSx?

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While it can vary depending on Unix implementation, typically the notation CxTxDxSx refers to controller or channel path from the server (the HBA), target address of the device, device sub-address (LUN) and, on some systems, the slice or partition on the disk. So, for example, C0T0D1S4 would represent the HBA identified with an address of 0, a SCSI target (even for Fibre Channel) of 0, LUN 1, and Unix slice or partition number 4. Note that a LUN or storage device that is multi-pathed could have multiple addresses pointing to the same LUN. If a server has two HBAs, one being C0 and the other being C1, and a LUN on a storage device that is accessible via a dual controller RAID array with SCSI targets T0 and T1, then the following addresses point to the same LUN: C0T0D1S4, C0T1D1S4, C1T0D1S4 and C1T1D1S4.

This was first published in September 2004

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