Methods for filesystem metadata caching to improve failover performance and devices thereof

A non-transitory computer readable medium having stored thereon instructions for mirroring metadata to a partner non-volatile random-access memory (NVRAM) comprising executable code which when executed by a processor, causes the processor to perform steps comprising:

• caching metadata related to an incoming data modifying operation processed by a client computing device to one or more storage devices comprising at least one non-volatile random access memory (NVRAM);
• determining during the caching when there is a service interruption event making a data block present in the storage devices of a hosting storage node inaccessible to the client computing device;
• retrieving the requested metadata block from the at least one NVRAM when the service interruption event is determined;
• and
• warming a cache using the retrieved metadata block from the at least one NVRAM.

A storage controller device comprising:

• a processor;
• a memory coupled to the processor which is configured to be capable of executing programmed instructions comprising and stored in the memory to:
• cache metadata related to an incoming data modifying operation processed by a client computing device to one or more storage devices comprising at least one non-volatile random access memory (NVRAM);
• determine during the caching when there is a service interruption event making a data block present in the storage devices of a hosting storage node inaccessible to the client computing device;
• retrieve the requested metadata block from the at least one NVRAM when the service interruption event is determined;
• and
• warm a cache using the retrieved metadata block from the at least one NVRAM.

The device as set forth in claim 11 wherein the processor coupled to the memory is further configured to be capable of executing at least one additional programmed instruction comprising and stored in the memory to:

• determine when the data block required for the incoming data operation request is present in a storage device of the hosting storage node;
• obtain the data block required to process the received data operation request from a storage device of the hosting storage node when the determining indicates the data block required for the received data operation request is not present in a system memory of the hosting storage node;
• and
• cache the obtained data block in the NVRAM of the hosting storage node.