StorageTek StorageNet SCSI-3 - Manual (Page 13)

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Chapter 1 Product Overview
Introduction
This chapter describes StorageTek’s implementation of SES (SCSI-3 Enclosure Services) on
the StorageNet Fibre Channel Switch 4000.
SES implementation in a SCSI-3-based Host Adapter is up to the adapter manufacturer and
StorageTek cannot determine their implementation. Therefore, the focus of this guide is to
discuss StorageTek’s implementation of SES within the Fabric.
Note: Currently, the SES standard is in DRAFT status and is subject to change. See
“Reference Documents” for a pointer to the SES Standards Committee’s web site.
SES Management
SES is an in-band mechanism for managing devices, such as switches, within a Fabric or other
enclosures. SES commands are used to manage and sense the operational status of the power
supplies, cooling devices, displays, indicators, individual drives, and other non-SCSI elements
installed in a switch (enclosure). The command set uses the SCSI
SEND DIAGNOSTIC and
RECEIVE DIAGNOSTIC RESULTS commands to obtain/set configuration information from
the switch.
SES allows a SCSI entity (or initiator) to communicate with a switch through a standard Fiber
Channel Protocol (FCP) connection into the Fabric. The benefits are:
• SES does not require supporting another protocol
• SES does not require an additional network link (such as Ethernet)
Figure 1-1 shows the Fabric SES view. The switch’s Domain_ID is used as the Logical Unit
Number (LUN) address to identify each switch including the switch used for access through
SES. See the
“SES Functional Model” section in Chapter 2 for more information.
Note: The connection to the Fabric is through the switch labeled LUN5 and which is also
called LUN0. The connection to the well known management address (FFFFFAh) is
always labeled LUN0 no matter which switch is used.