HP Surestore 64 FW 05.01.00 and SW 07.01.00 HP StorageWorks SAN High Availabil - Page 90
Cascaded fabric, fabric element
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Planning Considerations for Fibre Channel Topologies TM 10/100 RST TM PWR ERR 10/100 RST 31 29 27 25 23 TM 30 28 26 24 21 19 17 15 13 11 9 22 20 18 7 5 3 1 16 14 12 10 8 6 4 2 0 PWR ERR TM Interswitch Link Fabric Connection Figure 36: Cascaded fabric One design variation is to use more than one ISL between fabric elements. This eliminates ISLs as a single point of failure and greatly increases the fabric design reliability. Cascaded fabrics are well suited for applications where data access is local, but not for applications that require any-to-any connectivity. Device locality implies that groups of servers and the storage they access are connected through the same fabric element, and that ISLs are used primarily for fabric management traffic (Class F traffic) or low-bandwidth SAN applications. For additional information, refer to "Device Locality" on page 100. 90 SAN High Availability Planning Guide