Multi-fabric SAN based data migration

• US 8,914,540 B1
• Filed: 07/01/2008
• Issued: 12/16/2014
• Est. Priority Date: 07/01/2008
• Status: Active Grant

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Chari, Rahul, Barooah, Manas
• Primary Examiner(s): Tran, Jimmy H
• Application Number:
  US12/166,263
• Time in Patent Office: 2,359 Days
• Field of Search: 709/238, 709/242, 709/244, 711/114, 711/162, 711/112, 711/165, 707/827, 710/1, 714/6.23
• US Class Current: 709/238
• CPC Class Codes: G06F 15/17331 Distributed shared memory [DSM], e.g. remote direct memory access [RDMA]
• CPC Class Codes: G06F 3/0607 by facilitating the process of upgrading existing storage systems, e.g. for improving compatibility between host and storage device
• CPC Class Codes: G06F 3/0613 in relation to throughput
• CPC Class Codes: G06F 3/0647 Migration mechanisms
• CPC Class Codes: G06F 3/067 Distributed or networked storage systems, e.g. storage area networks [SAN], network attached storage [NAS]
• CPC Class Codes: H04L 67/1097 for distributed storage of data in networks, e.g. transport arrangements for network file system [NFS], storage area networks [SAN] or network attached storage [NAS]

Abstract

In one embodiment, a network device in a network obtains information identifying first storage and second storage. The network device notifies one or more other network devices in the network that traffic that is received by the other network devices is to be routed to the network device. The network device performs data migration from the first storage to the second storage. When the data migration from the first storage to the second storage is completed, the network device notifies the other network devices in the network that traffic that is received by the other network devices is no longer to be routed to the network device.

Claims

1. A method, comprising:

receiving by a data migration node in a network an indicator that the data migration node is responsible for managing data migration from a first storage to a second storage;

obtaining information by the data migration node, the information identifying the first storage and the second storage;

notifying by the data migration node one or more network devices in the network that traffic that is received by the one or more network devices is to be routed to the data migration node, so that the data migration node selectively serves as one of a proxy initiator and a proxy target during data migration between the first storage and the second storage;

performing data migration by the data migration node from the first storage to the second storage;

when the data migration from the first storage to the second storage is completed, notifying by the data migration node the one or more network devices in the network that traffic that is received by the network devices is no longer to be routed to the data migration node; and

communicating a status of the data migration by the data migration node to one or more other data migration nodes responsible for managing data migration, wherein the data migration node is an internal node of the network.

2. The method as recited in claim 1, further comprising:

receiving a notification indicating that the data migration node has been selected to be responsible for data migration from the first storage to the second storage.

3. The method as recited in claim 1, further comprising:

identifying one or more storage devices in the first storage that are accessible by a host.

4. The method as recited in claim 3, further comprising:

mapping the one or more storage devices in the first storage that are accessible by the host to one or more storage devices in the second storage;

wherein performing data migration from the first storage to the second storage includes copying data from the one or more storage devices in the first storage to the one or more storage devices in the second storage.

5. The method as recited in claim 4, wherein copying the data from the one or more storage devices in the first storage to the one or more storage devices in the second storage is performed using an identifier of the host.

6. The method as recited in claim 3, further comprising:

identifying one or more storage devices in the second storage that are accessible by the host;

mapping the one or more storage devices in the first storage to the one or more storage devices in the second storage;

wherein performing data migration from the first storage to the second storage includes copying data from the one or more storage devices in the first storage to the one or more storage devices in the second storage, wherein copying is performed using an identifier of the host.

7. The method as recited in claim 1, further comprising:

mapping one or more storage devices in the first storage that are accessible to a host to one or more storage devices in the second storage; and

wherein performing data migration from the first storage to the second storage includes copying data by the data migration node from the one or more storage devices in the first storage to the one or more storage devices in the second storage, wherein copying is performed using an identifier of the host.

8. The method as recited in claim 1, wherein communicating the status of the data migration to one or more other data migration nodes responsible for managing data migration comprises:

notifying the one or more other data migration nodes responsible for managing data migration that a specified set of one or more blocks in the first storage are currently being copied.

9. The method as recited in claim 1, wherein communicating the status of the data migration to the one or more other data migration nodes responsible for managing data migration comprises:

notifying the one or more other data migration nodes responsible for managing data migration that migration of a specified set of one or more blocks in the first storage is completed.

10. The method as recited in claim 1, wherein the one or more other data migration nodes responsible for data migration are in one or more other fabrics.

11. The method as recited in claim 1, wherein all traffic in the network is routed to the data migration node during data migration, thereby enabling the data migration node to handle write commands to the first set of storage while copying data from the first set of storage to the second set of storage.

12. The method as recited in claim 1, wherein the data migration node is a switch or router that is internal to the network.

13. The method as recited in claim 1, wherein the one or more other data migration nodes are internal nodes.

14. The method as recited in claim 13, wherein each of the one or more other data migration nodes maintains a status of the data migration between the first storage and the second storage.

15. The method as recited in claim 1, wherein each of the one or more other data migration nodes maintains a status of the data migration between the first storage and the second storage.

16. The method as recited in claim 1, wherein each of the one or more other data migration nodes is configured to perform data migration between storage devices.

17. The method as recited in claim 1, wherein the data migration node is a router or switch.

18. The method as recited in claim 1, wherein the one or more other data migration nodes responsible for managing data migration comprise routers or switches.

19. The method as recited in claim 1, wherein the data migration node does not include the second storage.

20. An apparatus, comprising:

a processor; and

a memory, at least one of the processor or the memory being configured for;

receiving by a data migration node in a network an indicator that the data migration node is responsible for managing data migration from a first storage to a second storage;

obtaining information by the data migration node, the information identifying the first storage and the second storage;

notifying by the data migration node one or more network devices in the network that traffic that is received by the one or more network devices is to be routed to the data migration node, so that the data migration node selectively serves as one of a proxy initiator and a proxy target during data migration between the first storage and the second storage;

performing data migration by the data migration node from the first storage to the second storage;

when the data migration from the first storage to the second storage is completed, notifying by the data migration node the one or more network devices in the network that traffic that is received by the one or more network devices is no longer to be routed to the data migration node; and

communicating a status of the data migration by the data migration node to one or more other data migration nodes responsible for managing data migration, wherein the data migration node is an internal node of the network.

21. The apparatus as recited in claim 20, at least one of the processor or the memory being further adapted for:

receiving a notification indicating that the data migration node has been selected to be responsible for data migration from the first storage to the second storage.

22. The apparatus as recited in claim 20, at least one of the processor or the memory being further adapted for:

identifying one or more storage devices in the first storage that are accessible by a host; and

mapping the one or more storage devices in the first storage to one or more storage devices in the second storage;

wherein performing data migration from the first storage to the second storage includes copying data from the one or more storage devices in the first storage to the one or more storage devices in the second storage, wherein copying the data from the one or more storage devices in the first storage to the one or more storage devices in the second storage is performed using an identifier of the host.

23. A non-transitory computer-readable medium storing thereon computer-readable instructions, comprising:

instructions for receiving by a data migration node in a network an indicator that the data migration node is responsible for managing data migration from a first storage to a second storage;

instructions for obtaining information by the data migration node, the information identifying the first storage and the second storage;

instructions for notifying by the data migration node one or more network devices in the network that traffic that is received by the one or more network devices is to be routed to the data migration node, so that the data migration node selectively serves as one of a proxy initiator and a proxy target during data migration between the first storage and the second storage;

instructions for performing data migration by the data migration node from the first storage to the second storage;

instructions for notifying by the data migration node the one or more network devices in the network that traffic that is received by the one or more network devices is no longer to be routed to the data migration node when the data migration from the first storage to the second storage is completed; and

communicating a status of the data migration by the data migration node to one or more other data migration nodes responsible for managing data migration, wherein the data migration node is an internal node of the network.

24. The non-transitory computer-readable medium as recited in claim 23, further comprising:

instructions for processing a notification that has been received, the notification indicating that the data migration node has been selected to be responsible for data migration from the first storage to the second storage.