HP StorageWorks 2/24 FW 07.00.00/HAFM SW 08.06.00 McDATA Products in a SAN Env - Page 244
Full Volatility, route Fibre Channel
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Physical Planning Considerations 5 Server 1 Server 2 TM Director A Trunk ISL 1 ISL 2 ISL 1 TM ISL 2 Director B Storage 1 Storage 2 Server 3 Figure 5-8 OpenTrunking The figure illustrates two Intrepid 6064 Directors connected by two ISLs. Three servers use the ISLs to communicate with two storage devices. Without trunking, servers 1 through 3 route Fibre Channel traffic from to director B without regard to any data rates. A possible scenario is that servers 1 and 2 route high data rate traffic through ISL 1 to storage device 1 (ISL oversubscription) and server 3 routes low data rate traffic through ISL 2 to storage device 2 (ISL undersubscription). Preferred path configurations are more restrictive than, and take precedence over, OpenTrunking. Even if OpenTrunking is enabled, no attempt is made to reroute traffic away from a preferred path, even if the path is congested or BB_Credit starved. Full Volatility Full volatility is a feature (available on directors and fabric switches with E/OS Version 6.0 and later) that supports military, classified, or other high-security environments that require Fibre Channel data not be retained by the director or fabric switch after power off or failure. 5-38 McDATA Products in a SAN Environment - Planning Manual