Browse Prior Art Database

Fibre Channel long distance FLOGI BBC Information automatic modification

IP.com Disclosure Number: IPCOM000126508D
Original Publication Date: 2005-Jul-22
Included in the Prior Art Database: 2005-Jul-22
Document File: 2 page(s) / 16K

Publishing Venue

IBM

Abstract

Disclosed is a system that enables SAN distance extension is provided by FC switch or end storage device to ensures the source storage device never reaches its maximum allowed BBC count, and so enables it to maintain full throughput even at very long distances.

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Fibre Channel long distance FLOGI BBC Information automatic modification

1. NEEDS FOR THE SYSTEM

FC switch or end storage device can increase additional buffer credit memory. it is costly.

FC switch or end storage device additional buffer credit memory is fixed and it is difficult to change depend on the SAN distance.
2. CONCEPT OF THE SYSTEM

As the source storage device sends a Fibre Channel frame more than  receiving storage device exceed that at which can received at the destination until certain number,  all transmitted Fibre Channel frames are buffered in the  long distance WAN connection and receiving storage device. The certain number is related the delay of WAN connection. If certain  number is fare enough, it is no need to use storage device additional  buffer credit. 

2. Operation
2.1 Manual operation Following are done by human provisioning

Calculate the delay of value using SAN distance between FC switches or end storage devices.

Calculate the BBC credit equivalent value using the delay.

Calculate the fake BBC value. The fake BBC value = Real BBC buffer + The BBC value equivalent the delay
Use the fake BBC value as BBC credits of ELP or PLOGI/FLOGI frame .

2.2 Automatical operation Following are done by automatic provisioning using Test explore frame.

Send the Test frame to calculate the delay of value using SAN distance...