Failover methods and system in a networked storage environment
Failover methods and systems for a storage environment are provided. During a takeover operation to take over storage of a first storage system node by a second storage system node, the second storage system node copies information from a first storage location to a second storage location. The first storage location points to an active file system of the first storage system node, and the second storage location is assigned to the second storage system node for the takeover operation. The second storage system node quarantines storage space likely to be used by the first storage system node for a write operation, while the second storage system node attempts to take over the storage of the first storage system node. The second storage system node utilizes information stored at the second storage location during the takeover operation to give back control of the storage to the first storage system node.
1. A method executed by one or more processors, comprising:
reserving storage space in a second storage system node, wherein the storage space is for use by a first storage system node for any write operations that occur while the second storage system node attempts to take over storage of the first storage system node, wherein the first storage system node and the second storage system node are configured to operate as failover partner nodes;
in response to detecting the first storage system node is healthy, copying, by the second storage system node, information from a second storage location assigned to the second storage system node to a first storage location assigned to the first storage system node; and
releasing, by the second storage system node, ownership of the storage space to the first storage system.
2. The method of claim 1 , further comprising:
in response to detecting the first storage system node is unresponsive, copying by the second storage system node configuration information regarding the storage of the first system node from the first storage location to the second storage location.
3. The method of claim 1 , further comprising:
prior to the second storage system node attempting to take over storage of the first storage system node, assigning the first storage location to the first storage system node to point to an active file system of the first storage system node.
4. The method of claim 3 , further comprising:
accessing the active file system of the first storage system node using information copied from the first storage location to the second storage location.
5. The method of claim 1 , further comprising:
upon detecting a failure in the second storage system node while taking over the storage of the first storage system node, using a third storage system node for taking over storage of the second storage system node to complete taking over storage of the first storage system node.
6. The method of claim 1 , further comprising:
allocating a third storage location for the second storage system node to track write requests for storage managed by the second storage system node.
7. The method of claim 1 , further comprising:
allocating, by the second storage system node, storage space for storing data for a write request that would have been written by the first storage system node.
8. A non-transitory, machine readable storage medium having stored thereon instructions comprising machine executable code, which when executed by a machine, causes the machine to:
reserve storage space in a second storage system node, wherein the storage space is for use by a first storage system node for any write operations that occur while the second storage system node attempts to take over storage of the first storage system node, wherein the first storage system node and the second storage system node are configured to operate as failover partner nodes;
in response to detecting the first storage system node is healthy, copy, by the second storage system node, information from a second storage location assigned to the second storage system node to a first storage location assigned to the first storage system node; and
release, by the second storage system node, ownership of the storage space to the first storage system.
9. The non-transitory, machine readable storage medium of claim 8 , wherein the machine executable code further causes the machine to:
in response to detecting the first storage system node is unresponsive, copy by the second storage system node configuration information regarding the storage of the first system node from the first storage location to the second storage location.
10. The non-transitory, machine readable storage medium of claim 8 , wherein the machine executable code further causes the machine to:
prior to the second storage system node attempting to take over storage of the first storage system node, assign the first storage location to the first storage system node to point to an active file system of the first storage system node.
11. The non-transitory, machine readable storage medium of claim 10 , wherein the machine executable code further causes the machine to:
access the active file system of the first storage system node using information copied from the first storage location to the second storage location.
12. The non-transitory, machine readable storage medium of claim 8 , wherein the machine executable code further causes the machine to:
upon detecting a failure in the second storage system node while taking over the storage of the first storage system node, use a third storage system node for taking over storage of the second storage system node to complete taking over storage of the first storage system node.
13. The non-transitory, machine readable storage medium of claim 8 , wherein the machine executable code further causes the machine to:
allocate a third storage location for the second storage system node to track write requests for storage managed by the second storage system node.
14. A system, comprising:
a first storage system node;
a second storage system node, wherein the first storage system node and the second storage system node are configured to operate as failover partner nodes;
a memory containing machine readable medium comprising machine executable code having stored thereon instructions; and
a processor coupled to the memory to execute the machine executable code to cause the second storage system node to:
reserve storage space in the second storage system node, wherein the storage space is for use by the first storage system node for any write operations that occur while the second storage system node attempts to take over storage of the first storage system node;
in response to detecting the first storage system node is healthy, copy, by the second storage system node, information from a second storage location assigned to the second storage system node to a first storage location assigned to the first storage system node; and
release, by the second storage system node, ownership of the storage space to the first storage system.
15. The system of claim 14 , wherein the machine executable code further causes to:
in response to detecting the first storage system node is unresponsive, copy by the second storage system node configuration information regarding the storage of the first system node from the first storage location to the second storage location.
16. The system of claim 14 , wherein the machine executable code further causes to:
prior to the second storage system node attempting to take over storage of the first storage system node, assign the first storage location to the first storage system node to point to an active file system of the first storage system node.
17. The system of claim 16 , wherein the machine executable code further causes to:
access the active file system of the first storage system node using information copied from the first storage location to the second storage location.
18. The system of claim 14 , wherein the machine executable code further causes to:
upon detecting a failure in the second storage system node while taking over the storage of the first storage system node, use a third storage system node for taking over storage of the second storage system node to complete taking over storage of the first storage system node.
19. The system of claim 14 , wherein the machine executable code further causes to:
allocate a third storage location for the second storage system node to track write requests for storage managed by the second storage system node.
20. The system of claim 14 , wherein the machine executable code further causes to:
allocate, by the second storage system node, storage space for storing data for a write request that would have been written by the first storage system node.