Symantec Corporation

Veritas Technologies LLC

Mithlesh Thukral

Mukesh Sohanlal Bafna

Anindya Banerjee

Shirish Vijayvargiya

Sanjay Kumar Jain

Sanjay Kumar

Sushil Sarjerao Patil

Caching metadata that identify hot blocks at a per local cache level are tracked. Tracked caching metadata are maintained so as to be persistent and shared across nodes of the cluster. Local caches are pre-warmed by using maintained caching metadata, responsive to detecting specific node level events. Such events can result in hot blocks being absent from a local cache, such as a failover between nodes or an unexpected failure local to a specific node. Another event example is the access of shared storage content, such as opening a file or mounting a file system by a specific node, in response to which the associated local cache can be pre-warmed using the tracked caching metadata for the specific file, or for each file of the file system. To pre-warm a local cache, hot blocks of stored content identified by corresponding caching metadata are loaded into the local cache.

Local cache pre-warming

A computer-implemented method for eliminating inconsistencies between backing stores and caches may include (1) detecting at least one inconsistency between a backing store and a cache, (2) identifying a synchronization marker that bifurcates write operations queued in the cache into (i) a subset of one or more write operations known to have been successfully performed on the backing store and (ii) an additional subset of one or more additional write operations not yet known to have been successfully performed on the backing store, (3) identifying the additional subset of additional write operations based at least in part on the synchronization marker, (4) performing the additional subset of additional write operations on the backing store, and then (5) updating the synchronization marker based at least in part on performing the additional subset of additional write operations on the backing store. Various other methods, systems, and computer-readable media are also disclosed.

Systems and methods for eliminating inconsistencies between backing stores and caches

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Maharashtra, India

Mithlesh Thukral