Network station adjustable fail-over time intervals for booting to backup servers when transport service is not available

• US 6,738,923 B1
• Filed: 09/07/2000
• Issued: 05/18/2004
• Est. Priority Date: 09/07/2000
• Status: Expired due to Fees

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Brewer, James Arthur, Blam, Norbert M., Tysor, Charles Edward
• Primary Examiner(s): Beausoliel, Robert
• Assistant Examiner(s): PUENTE, EMERSON C
• Application Number:
  US09/656,672
• Time in Patent Office: 1,349 Days
• Field of Search: 714/4, 714/13, 714/18, 714/55, 714/749, 709/234
• US Class Current: 714/4.11
• CPC Class Codes: H04L 69/40 for recovering from a failure of a protocol instance or entity, e.g. service redundancy protocols, protocol state redundancy or protocol service redirection management of faults, events, alarms or notifications in data switching networks H04L41/06

Abstract

A method for adjusting failover intervals in a computer network is provided. In one embodiment of the present invention transport protocol requests are sent to a backup server, receiving response messages from the server, and then the rate of transport protocol requests is adjusted according to the response messages.

Claims

1. A method for adjusting failover intervals in a computer network, comprising:

submitting transport protocol requests to a backup server;

receiving response messages from the backup server; and

adjusting the rate of transport protocol requests according to the response messages, wherein the step adjusting the rate of transport protocol requests includes providing an acceleration factor which is used in conjunction with ICMP responses and a boot attempt counter to determine the failover interval.

2. The method according to claim 1, wherein the step submitting transport protocol requests includes:

submitting a predetermined number of requests; and

using a predetermined time-out interval between each request.

3. The method according to claim 1, wherein the step receiving response messages from the backup server includes receiving ICMP response messages.

4. The method according to claim 1, wherein the method is executed during a failover performed in a fault tolerant computer network.

5. The method according to claim 1, wherein the method is executed during a failover performed by network stations booting from remote servers.

6. The method according to claim 1, wherein the method is executed during a failover performed by network stations peer booting from another network station.

7. A computer program production a computer readable medium for adjusting failover intervals in a computer network, comprising:

instructions for submitting transport protocol requests to a backup server;

instructions for receiving response messages from the backup server; and

instructions for adjusting the rate of transport protocol requests according to the response messages, wherein the step adjusting the rate of transport protocol requests includes instructions for providing an acceleration factor which is used in conjunction with ICMP responses and a boot attempt counter to determine the failover interval.

8. The computer program product according to claim 7, wherein the step submitting transport protocol requests includes:

instructions

instructions for submitting a predetermined number of requests; and

instructions for using a predetermined time-out interval between each request.

9. The computer program product according to claim 7, wherein the step receiving response messages from the backup server includes instructions for receiving ICMP response messages.

10. The computer program product according to claim 7, wherein the instructions are executed during a failover performed in a fault tolerant computer network.

11. The computer program product according to claim 7, by network stations booting from remote servers.

12. The computer program product according to claim 7, wherein the instructions are executed during a failover performed by network stations peer booting from another network station.

13. A system for adjusting failover intervals in a computer network, comprising:

means of submitting transport protocol requests to a backup server;

means of receiving response messages from the backup server; and

means of adjust the rate of transport protocol requests according to the response messages, wherein the step adjusting the rate of transport protocol requests includes providing an acceleration factor which is used in conjunction with ICMP responses and a boot attempt counter to determine the failover interval.