Generic Technique to Uniquely Detect Storage Devices
Original Publication Date: 2004-Feb-20
Included in the Prior Art Database: 2004-Feb-20
The ability to uniquely detect a small computer system interface SCSI device whether attached to a parallel SCSI bus or a Fibre Channel fabric. The SCSI/Fibre Channel devices have information stored on their code pages that can be used to uniquely identify a device. The information within these code pages can be vendor unique and do not always follow standards. The problem is worse when looking across devices provided by different vendors where the same field within a code page has different meanings. The problem with uniquely identifying a device has become a real problem when the device is attached through multiple paths. In this case the same device will be presented multiple times to the host system. If path management software is to work properly it must know which device instances detected down different paths are really the same unique physical device.