IBM 890 manual FICON Connectivity, FICON Support for Cascaded Directors, FCP Channels

is the case with ESCON), but will also support multiple device defi nitions. For example, ESCON channels that are dedicated as CTC cannot communicate with any other device, whereas native FICON (FC) channels are not dedi- cated to CTC only. Native can support both device and CTC mode defi nition concurrently, allowing for greater con- nectivity fl exibility.

high availability, extended distance connectivity, and (par- ticularly with the implementation of 2 Gbps Inter Switch Links), has the potential for fi ber infrastructure cost sav- ings by reducing the number of channels for interconnect- ing the 2 sites.

FICON cascaded directors have the added value of high integrity connectivity. New integrity features introduced

FICON Connectivity

FICON

Bridge

ESCD 9032 Model 5

FICON

Bridge

ESCON

CU

ESCON

CU

ESCON

CU

ESS

F10, F20, 800

within the FICON Express channel and the FICON cas- caded switch fabric to aid in the detection and reporting of any miscabling actions occurring within the fabric during and helps prevent data from being delivered to the wrong end point.

FICON cascaded directors is offered in conjunction with IBM, CNT, and McDATA Directors.

All FICON Channels = 100MB/s

= LX ONLY

= LX or SX

		140
		or
64			Enterprise
32,		PORT
2032			Tape
			Controller
			3590 A60
		256
		or
		128
64,		PORT
2042
			Enterprise
			Tape
			Controller
			3590 A60
		ESS
	F10, F20, 800

Two site non-cascaded director topology. Each CEC connects to directors in both sites.

With Inter Switch Links (ISLs), less fiber cabling may be needed for cross-site connectivity

Two Site cascaded director

topology. Each CEC connects to local directors only.

FICON Support for Cascaded Directors

Native FICON (FC) channels support cascaded directors. This support is for a single hop confi guration only. This means that a Native FICON (FC) channel or a FICON CTC can connect a server to a device or other server via two (same vendor) FICON Directors in between. This type of cascaded support is important for disaster recovery and business continuity solutions because it can help provide

FCP Channels

zSeries supports FCP channels, switches and FCP/SCSI devices with full fabric connectivity under Linux on zSeries and z/VM Version 4 Release 3 and later. Support for FCP devices means that zSeries servers will be capable of attaching to select FCP/SCSI devices and may access these devices from Linux on zSeries. This expanded

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