Browse Prior Art Database

Compatibility Mode for the Establishment of Peer to Peer Remote Copy Paths

IP.com Disclosure Number: IPCOM000035614D
Original Publication Date: 2005-Jan-26
Included in the Prior Art Database: 2005-Jan-26
Document File: 1 page(s) / 20K

Publishing Venue

IBM

Abstract

Compatibility Mode for the Establishment of Peer to Peer Remote Copy Paths

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Compatibility Mode for the Establishment of Peer to Peer Remote Copy Paths

The Peer to Peer Remote Copy (PPRC) function requires physical connectivity between Disk Control unit boxes in order to mirror data volumes for disaster recovery or other purposes. The physical links used for the connectivity are fiber optic links attached to the control units. The 2105 ESS Control units supports two types of fiber. ESCON is a 200 megabit technology and Fibre Channel is gigabit technology. In addition, the method of describing the paths and adapters is different for the two technologies.

The solution described in this article will allow the different types of information needed to identify the paths and adapters without disruption to existing software and API interfaces used to control the copy function.

The solution consists of a set of commands issued from a host to the control unit and two tables. One table contains the World Wide Node Names (WWNNs) of the fibre channel adapters and the adapter identifiers. The other table contains the ESCON controller serial numbers and adapter identifiers. When it is desired to connect using ESCON fiber, the customer enters the source and target box serial numbers and the source and target adapter Ids in the establish command. When it is desired to connect using FICON fiber, the customer enters the source and target WWNNs into the same fields in the establish command as is allocated for the ESCON serial numbers and enters the adapter...