Emc IP Holding Company LLC

Vrushali A Kulkarni

Yamini Allu

Srisailendra Yallapragada

Balaji Subramanian

Sirisha Kaipa

Rahul Ugale

Satish Visvanathan

According to some embodiment, a backup storage system receives a request from a client to read a data segment associated with a file object stored in a storage system. In response to the request, the system performs a lookup operation in a first index stored in a memory to identify a first index entry based on a fingerprint of the requested data segment to obtain a first write-evict unit (WEU) identifier (ID) identifying a first WEU storing the requested data segment. The system accesses a solid state device (SSD) operating as a cache memory device to retrieve the data segment from the first WEU. The system extracts and decompresses a compressed data segment retrieved from the first WEU and returns the decompressed data segment to the client without accessing a storage unit for retrieving the same data segment.

Accessing deduplicated data from write-evict units in solid-state memory cache

An example method includes receiving a stream that identifies I/O operations requested to be performed with respect to a data grouping, identifying, in the stream, random I/O requests and sequential I/O requests, queuing the sequential I/O requests in a priority/processing queue and processing the sequential I/O requests immediately without waiting for loading of any metadata, and processing a first one of the random I/O requests and a second one of the random I/O request. When the first and second random I/O requests each depend on the same range of metadata, the first and second random I/O requests are processed in the order received, and when the first and second random I/O requests each depend on different respective ranges of metadata, the first and second random I/O requests are processed at the same time.

Processing I/O operations in parallel while maintaining read/write consistency using range and priority queues in a data protection system

In one example, a method includes receiving a stream that identifies I/O operations requested to be performed with respect to a data grouping, and identifying, in the stream, random I/O requests and sequential I/O requests. Next, the stream is split into an incoming queue containing the sequential I/O requests and a priority/processing queue containing the random I/O requests. A metadata load queue is then defined by assigning each of the random I/O requests to a respective range of metadata. The metadata of each range is loaded, and the random I/O requests re-queued. Using the loaded metadata, a random I/O operation is performed that corresponds to one of the random I/O requests. Finally, the random I/O operation and a sequential I/O operation are performed concurrently with each other.

Growing community of inventors

Sunnyvale, CA, United States of America

Vrushali A Kulkarni