HP Surestore 64 FW 05.01.00 and SW 07.01.00 HP StorageWorks SAN High Availabil - Page 91
Ring Fabric, Ring fabric, Like cascaded fabrics
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Planning Considerations for Fibre Channel Topologies Ring Fabric A ring fabric consists of a continuous string of directors or switches connected by one or more ISLs. Each fabric element is connected to the next fabric element (like a cascaded fabric, but with the end-point fabric elements connected). Figure 37 illustrates a ring fabric topology. TM TM TM 10/100 RST TM PWR ERR 10/100 RST TM PWR ERR 10/100 RST 31 29 27 25 23 TM 21 19 17 30 28 26 24 22 20 18 16 15 14 13 12 11 9 7 5 3 1 10 8 6 4 2 0 PWR ERR TM TM Interswitch Link Fabric Connection Figure 37: Ring fabric Ring fabrics are generally more expensive than cascaded fabrics, are also easy to deploy, provide a simple solution to add additional fabric devices, and can solve hop-count problems inherent to cascaded fabrics. Ring fabrics also have increased reliability because traffic can route around a single ISL, director, or switch failure (subject to hop count limitations). Like cascaded fabrics, ring fabrics are well suited for applications where data access is local, but not for applications that require any-to-any connectivity. In addition, ring fabrics are useful when connecting SANs over a MAN or WAN. These networks typically use a ring topology. SAN High Availability Planning Guide 91