Emc IP Holding Company LLC

Dell Products Inc.

Emc Corporation

Kamakshi Viswanadha

Philippe Armangau

Alex Zhongbing Yang

Vamsi K Vankamamidi

Yining Si

Christopher A Seibel

Yan Xu

Andrew T Feld

Steve Zhuxiong Ai

Jean-Pierre Bono

William C Davenport

Ivan Bassov

Ye Zhang

Ajay Karri

Yubing Wang

Michael C Brundage

Monica Chaudhary

Yaming Kuang

Qi Mao

Yunfei Chen

Changyong Yu

Piers Yu

In at least one embodiment, processing can include: receiving, from a client, a request to access a metadata (MD) page, wherein the request specifies a lock type denoting a particular level of access to the MD page that is being requested by the request; and responsive to receiving the request, performing first processing including: locking the MD page and a corresponding translation table entry Efor the MD page in accordance with the lock type denoting a particular level of access being requested, wherein Emaps a logical address LAof the MD page to a physical storage or location PAon non-volatile storage where the MD page is stored; and subsequent to said locking, returning a response including the MD page to the client.

Techniques for destaging translation table updates and accessing translation table entries in a log-structured system

In at least one embodiment, processing can include: storing a metadata page at new physical location PA2 on non-volatile storage; and recording in a translation table (TT) log, a TT update to a mapping entry E1 of the TT, wherein the TT update updates E1 of the TT to map a logical address LA1 of the metadata page to PA2. Recording can include querying a unified hash table (UHT) in accordance with LA1 to determine whether the UHT includes a UHT entry mapping LA1 to a corresponding physical address or location of where the MD page is stored on non-volatile storage. Responsive to determining that the UHT includes a UHT entry for LA1, processing can include: determining whether the UHT entry is a cache type. If the UHT entry is the cache type, processing can include converting the UHT entry to a delta type entry of the TT log.

Techniques using a unified cache for storing and accessing translation table entries and updates

A technique for managing storage of compressed data includes generating and enforcing a minimum slot size requirement. The minimum slot size is based at least in part on collected performance metrics that indicate a degree of compressibility of data received, compressed, and written by the data storage system. As new data arrive, the new data are compressed and stored in slots at least as big as the minimum slot size, in many cases effecting an over-allocation of storage space and improving the likelihood that subsequent overwrites will fit into existing slots.

Adaptively over-allocating storage space for compressed data

Processing for a file system may include determining an inconsistency between a data log and inodes (index nodes) of the file system. Responsive to determining the inconsistency, recovery processing may be performed including first processing of the data log, second processing of the inodes of the file system, and third processing of the data log after said second processing. First processing may, for each entry of the data log that records a create snapshot operation to create a snapshot of a file having an associated inode of the file system that is a dirty snapshot inode, marking the associated inode as 'snap validated'. Second processing may include freeing each dirty snapshot inode not marked as 'snap validated'. Third processing may include freeing any entry of the data log where the entry references dirty snapshot inode freed by the second processing.

Recovery processing for persistent file data cache to reduce data loss

A technique for overwriting compressed data tests whether new data compressed with a first compression procedure fits within spaces provided for previous data. If the compressed new data does not fit, the technique compresses the new data using a second compression procedure. Assuming the second compression procedure reduces the compressed size of the new data to fit the available space, the technique stores the new data in the same location as the previous data. In this manner, overwrites can be accommodated in place without the need to create new mapping metadata.

Overwriting compressed data extents

A method, computer program product, and computing system for defining an initial root slice for a storage system. A first data slice is defined for the storage system. The location of the first data slice of the storage system is identified within the initial root slice. A request for a supplement data slice within the storage system is received. A determination is made as to if the supplement data slice can be added within the storage system without defining a supplemental root slice for a storage system.

System and method for storage management using root and data slices

A method is used in managing recovery of file systems. A determination is made as to whether a file system requires a slice for recovering the file system. Based on the determination, storage is provisioned for the slice. Recovery of the file system is performed.

Managing recovery of file systems

A method is used in managing provisioning of storage in storage systems. Whether a logical object requires a slice for recovering the logical object is determined. Based on the determination, storage for the slice is provisioned. The slice is provided to the logical object.

Managing provisioning of storage in storage systems

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Lexington, MA, United States of America

Kamakshi Viswanadha