Emc Corporation

Emc IP Holding Company LLC

Miles Aram DeForest

Charles Christopher Bailey

Samuel L Mullis, Ii

David Haase

Mark A O'Connell

Jackson Brandon Myers

David W Harvey

Alan Lee Taylor

Dennis Thomas Duprey

Nagapraveen Veeravenkata Seela

Michael D Haynes

Paul Thomas McGrath

Michael C Brundage

Ajay Potnis

Dayanand Suldhal

Robert F Goudreau

Michael Paul Wagner

Jason L Taylor

Amit Dharmadhikari

Dixit Patel

Sairam Iyer

Sriram Nagasubramanian

Rahul Bhagwat

Saurbh M Pathak

Techniques are disclosed for performing storage object recovery. In one embodiment, there is disclosed a technique comprising allocating a scratch space to support recovery of a storage object, wherein the storage object comprises a set of slices and the scratch space is distinct with respect to the set of slices such that a slice allocator for allocating slices to and/or from the storage object is unaware of the existence of the scratch space. The technique also comprises taking offline the storage object for facilitating recovery of the storage object after at least a portion of the set of slices have been allocated. The technique further comprises performing a storage object recovery procedure to recover the storage object while the storage object is offline. The storage object recovery procedure utilizing the scratch space that was allocated to support the storage object recovery.

Performing storage object recovery

There is disclosed a computer-implemented method, an apparatus, and a computer program product for use in storage object recovery. In one embodiment, the method comprises determining that a storage object requires recovery, wherein the storage object comprises a dedicated recovery area at a fixed location. The method further comprises taking offline the storage object in response to determining that the storage object requires recovery. The method still further comprises performing a recovery procedure to recover the storage object, the recovery procedure utilizing the dedicated recovery area to support storage object recovery.

A method is used in managing accesses to storage. An amount of data storage space in use by a mapped logical volume and RAID group characteristics of a storage pool used by the mapped logical volume are determined. Based on the amount and the RAID group characteristics, a report of storage resources corresponding to the mapped logical volume is produced. Based on the report, accesses to the mapped logical volume are controlled.

Managing accesses to storage

Systems, methods, and computer readable medium for optimizing storage allocations based on system resources are disclosed. According to one aspect, the subject matter described herein includes a method for dynamic, policy-based allocation of system resources. The method includes maintaining statistics in connection with like system resources. Each of the system resources having associated statistics that are suitable for describing a relationship with an allocatable class of resource. A request is received for a resource. In response to receiving the request, one of the like system resources is selected, based on the statistics and a policy, as a best system resource in connection with the allocatable class of resource.

Methods, systems, and computer readable medium for dynamic, policy-based allocation of system resources

A method is used in managing properties collection. Storage objects for which properties information is to be refreshed are determined. A bulk request for properties information from file systems corresponding to the storage objects is generated and is issued to the file systems. Based on a response to the bulk request, a blocking transaction is used to update a model of the storage objects that is made available to management software.

Managing properties collection

A method is used in managing database access. A framework is provided for translating versioned data between memory and persistent storage. Based on the framework, read and write requests that access records in a database are translated. Based on the framework, it is made to appear that the database is a different version of the database.

Managing database access

A file server architecture decouples logical storage from physical storage and provides proactive detection and containment of faults, errors, and corruptions in a file system, in order to enable in place (online) and non-intrusive recovery. The file system is built upon a thinly provisioned logical volume, and there are stored three copies of the metadata defining the logical volume in order to provide quick, deterministic, and reliable recovery from a faulted system. A first copy of the metadata is distributed among all of the slices of physical storage allocated to the logical volume. A second copy of the metadata is stored in a root slice of the logical volume. A third copy of the metadata is stored separate from the slices of physical storage allocated to the logical volume.

Deterministic recovery of a file system built on a thinly provisioned logical volume having redundant metadata

A method and mechanism for function value synchronization among protocols in a shared resource unit providing shared resources to a plurality of resource users submitting requests for shared resource operations in a plurality of protocols wherein each request includes at least one primary function value and at least one associated function value. A database is constructed having a values entry for each primary value wherein each values entry contains a primary field for storing the corresponding primary value and an associated field for storing an associated value for each protocol. Unknown associated values are represented by sentinel values, and the sentinel values representing associated values are replaced by the appropriate associated values obtained from a system administrative function that maps the primary and associated values of the protocols. The replacement of sentinel values may occur upon a request for a shared resource that contains an associated value represented by a sentinel value and, for the whole database: upon a partial or complete base depending upon whether a partial remapping, such as an update, is to be performed or an complete remapping is to be performed.

Method and apparatus for synchronizing function values in a multiple protocol system

A method and mechanism for function value synchronization among protocols in a shared resource unit providing shared resources to a plurality of resource users submitting requests for shared resource operations in a plurality of protocols wherein each request includes at least one primary function value and at least one associated function value. A database is constructed having a values entry for each primary value wherein each values entry contains a primary field for storing the corresponding primary value and an associated field for storing an associated value for each protocol. Unknown associated values are represented by sentinel values, and the sentinel values representing associated values are replaced by the appropriate associated values obtained from a system administrative function that maps the primary and associated values of the protocols. The replacement of sentinel values may occur upon a request for a shared resource that contains an associated value represented by a sentinel value and, for the whole database, upon a partial or complete base depending upon whether a partial remapping, such as an update, is to be performed or an complete remapping is to be performed.

Growing community of inventors

Bahama, NC, United States of America

Miles Aram DeForest