HP Surestore 64 Planning Guide - Page 70
Extended-Distance Ports, High-Availability Considerations, Cost Effectiveness
View all HP Surestore 64 manuals
Add to My Manuals
Save this manual to your list of manuals |
Page 70 highlights
Cost Effectiveness Cost is the secondary factor governing the choice of transceiver type and optical fiber. Shortwave laser transceivers and multimode cable offer a less expensive solution if data transmission distance is not critical. Device or Cable Restrictions The choice of transceiver and cable type may be restricted or dictated by: • Device restrictions Some devices may be restricted to use of only one type of transceiver (shortwave or longwave). Refer to the device's supporting documentation for information. • Existing cable restrictions The enterprise may contain only one type of fiber-optic cable (multimode or singlemode), and the customer may be required to use the existing cables. Extended-Distance Ports HP supports the following director-to-director long distance connections: • Up to ten kilometers using longwave SFP interswitch link (ISL) connections. • Up to 100 kilometers by setting a port's buffer-to-buffer credit (BB_Credit) value to 60 and using DWDM equipment. HP supports DWDM customer-supplied equipment. High-Availability Considerations To provide high availability, multiple connections from a specific server, storage device, or application should be provided. It is recommended that multiple fiber-optic cable connections not be attached to the director through a single FPM card. Spreading connections across multiple FPM cards eliminates an individual port or card as a single point of failure. To improve performance, consider having multiple connections to a device. Refer to the device documentation to determine if this capability exists. 56 Port Connectivity and Fiber-Optic Cabling