Wide area network distribution, load balancing and failover for multiple internet protocol addresses

• US 10,178,032 B1
• Filed: 12/27/2015
• Issued: 01/08/2019
• Est. Priority Date: 09/23/2015
• Status: Active Grant

• Current Assignee: Emc IP Holding Company LLC (Dell Technologies Inc.)
• Original Assignee: Emc IP Holding Company LLC (Dell Technologies Inc.)
• Inventors: Freitas, Ornat S
• Primary Examiner(s): Vu, Huy D
• Assistant Examiner(s): Nguyen, Bao G
• Application Number:
  US14/979,484
• Time in Patent Office: 1,108 Days
• Field of Search: None
• CPC Class Codes: H04L 12/2854 Wide area networks, e.g. public data networks
• CPC Class Codes: H04L 45/24 Multipath
• CPC Class Codes: H04L 45/245 Link aggregation, e.g. trunking
• CPC Class Codes: H04L 47/125 by balancing the load, e.g. traffic engineering
• CPC Class Codes: H04L 61/5007 Internet protocol [IP] addresses
• CPC Class Codes: H04L 61/5061 Pools of addresses
• CPC Class Codes: H04L 67/10 in which an application is distributed across nodes in the network software deployment G06F8/60; multiprogramming arrangements G06F9/46
• CPC Class Codes: H04L 67/1001 for accessing one among a plurality of replicated servers
• CPC Class Codes: H04L 67/1095 Replication or mirroring of data, e.g. scheduling or transport for data synchronisation between network nodes
• CPC Class Codes: Y02D 30/50 in wire-line communication networks, e.g. low power modes or reduced link rate

Abstract

Embodiments for a method of providing dynamic load balancing and fail-over in a WAN network. The interface group architecture for WAN is applied to both sides of the source-destination connection to redirect the data movement of read/write operations away from a public network to a private network. The process identifies interface group selection criteria to be invoked on both source and destination servers to select a tenant-specific private network interface for multi-tenant servers. The method provides high availability communication to select the interface for reads/writes as well as load balancing across the interfaces of each interface group, and a failover interface for recovery from interfaces of the interface group.

Claims

1. A method for providing load balancing and failover across a wide area network (WAN) including a data storage system executing a replication process, the method comprising:

defining at least one interface group (ifgroup) that identifies a private network for one or more clients to communicate with a server over the network for read/write operations to distribute backup application client connections across available links of the data storage system while maintaining data path isolation;

assigning an alias Internet Protocol (IP) address to the at least one ifgroup to create a simple alias network configuration on the server that is communicated to the clients via protocol messages;

providing a command line interface (CLI) to allow simple configuration of the backup storage system to apply the ifgroup to a replication path by adding local MTree or destination to the ifgroup that support file replication, to perform tasks including,

redirecting a host name resolved IP address away from a public IP address of a public network between the clients and the server using the alias IP address;

identifying at least one interface group from a plurality of interface groups based on defined selection criteria, wherein all ifgroup configurations are localized to the data storage system;

selecting a private network interface from a list belonging to the identified interface group; and

providing load balancing and failover for interfaces of the interface group using the selected private network interface.

2. The method of claim 1 wherein the WAN is part of a multi-tenant network supporting enterprise level database applications used by the one or more clients to store data in the data storage system.

3. The method of claim 2 wherein the multi-tenant network is selected based on a connecting interface on the storage server belonging to an interface group using an auto-detect function.

4. The method of claim 3 wherein a client public subnet comprising an IP address range is used to select a selected tenant network upon a first connection attempt, and wherein a subsequent connection for failover interface selection is performed in case of failure of the first connection attempt.

5. The method of claim 2 wherein the client connects to a host server first over the public network then over the private network, and further wherein a renegotiation mechanism forces renegotiate of the interface group over the public network in case of a double connection error for a primary and alternate connection.

6. The method of claim 5 wherein additional host failover mechanism is used to recover public interface first connection errors for a high availability solution, and wherein additional public interfaces are specified by appending a term “

failover”

to a name of a remote server prior to domain name service (DNS) lookup to provide an alternate healthy network path.

7. The method of claim 2 wherein the data storage system is viewed as a client replicating data to a disaster recovery or data retention storage server.

8. The method of claim 7 wherein the interface group may use a directory path on a source and destination server for database replication, and may be used in conjunction with the remote server to select a correct tenant network of the multi-tenant network for database storage operations.

9. The method of claim 8 wherein the interface group is utilized on both the source and destination server for failover recovery on the WAN.

10. A method for distributing network connections in a wide area network (WAN) implementing a replication process, the method comprising:

providing a public internet protocol (IP) address range for interface group (ifgroup) selection to distribute backup application client connections across available links of the data storage system while maintaining data path isolation;

assigning an alias IP address to the at least one ifgroup to create a simple alias network configuration on host server that is communicated to client servers via protocol messages;

providing a command line interface (CLI) to allow simple configuration of a backup storage system of the WAN to apply the ifgroup to a replication path by adding local MTree or

destination to the ifgroup that support file replication, to perform tasks including,

directing network connections to a primary selected ifgroup using a first set of addresses for a first gateway using the alias IP address;

defining an alternate ifgroup using a second set of addresses for a second gateway using the alias IP address; and

forcing renegotiate of selection of the ifgroup in case of a network error resulting from failure of the primary and alternate ifgroup, wherein all ifgroup configurations are localized to a data storage system.

11. The method of claim 10 wherein the network comprises a multitenant network comprising a plurality of client servers coupled to the host server.

12. The method of claim 11 further comprising providing data replication for each tenant of the multi-tenant network, and wherein a service provider is required to separate the network for replication for each of the tenants.

13. The method of claim 12 further comprising utilizing a directory path used by a tenant on both a source of data replication and a target of data replication to select the ifgroup.

14. The method of claim 13 further comprising providing two addresses to two gateways from the ifgroup.

15. The method of claim 14 wherein the forced renegotiation sequentially tries all connection combinations from the source to the target side using the two addresses to the two gateways.

16. The method of claim 14 further comprising providing a host failover mechanism to recover public interface connection errors by providing additional public addresses by appending a term “

failover”

to a name of the target sever and assigning an address that utilizes the second gateway.

17. A computer program product, comprising a non-transitory computer-readable medium having a computer-readable program code embodied therein, the computer-readable program code adapted to be executed by one or more processors to implement a method for providing load balancing and failover across a wide area network (WAN) including a data storage system executing a replication process, the method comprising:

defining at least one interface group (ifgroup) that identifies a private network for one or more clients to communicate with a server over the network for read/write operations to distribute backup application client connections across available links of the data storage system while maintaining data path isolation;

assigning an alias Internet Protocol (IP) address to the at least one ifgroup to create a simple alias network configuration on the server that is communicated to the clients via protocol messages;

providing a command line interface (CLI) to allow simple configuration of the backup storage system to apply the ifgroup to a replication path by adding local MTree or destination to the ifgroup that support file replication, to perform tasks including,

redirecting a host name resolved IP address away from a public IP address of a public network between the clients and the server using the alias IP address;

identifying at least one interface group from a plurality of interface groups based on defined selection criteria, wherein all ifgroup configurations are localized to the data storage system;

selecting a private network interface from a list belonging to the identified interface group; and

providing load balancing and failover for interfaces of the interface group using the selected private network interface.