Emc Corporation

Emc IP Holding Company LLC

Dean D Throop

Dennis Thomas Duprey

Xiangping Chen

David W Harvey

Mark K Ku

Khang Can

Manish Madhukar

Miles Aram De Forest

David Haase

Karl M Owen

Michael D Haynes

Samuel Mullis

Jason L Taylor

Dean A Herington

A method is used in managing power usage in data center components. A control center is provided to manage power state information for multiple data center components. The control center may register data center components capable of operating in a reduced power state. The control center acquires requests to change the power state information and generated data center component instructions indicative of the power state information. The instructions are communicated to the registered data center components. The instructions are receive at the registered data center components and power usage is adjusted based on the received instructions.

Managing power reduction in data center components

A method is used in managing data activity information for data migration in data storage systems. Slice activity data for slices stored in a data storage system is identified. The slice activity data is divided into multiple subsets of slice activity data. A subset of slice activity data may be obtained and stored in working memory. The slice activity data may be updated to correspond to changes slice activity. After a determined time, the updated slice activity data is copied to a disk drive and the method is repeated with the next subset of slice activity data.

Managing data activity information for data migration in data storage systems

A method and a system for use in managing tiering in a cache-based system is disclosed wherein the cache-based system comprises a first data storage tier and a second data storage tier configured such that the performance characteristics associated with one of the tiers is superior to the performance characteristics associated with the other tier. In at least one embodiment the method and system comprises collecting a first set of I/O activity data for at least one data unit located in a cache, wherein the at least one data unit is associated with a data group located on the first data storage tier; collecting a second set of I/O activity data for the data group located on the first data storage tier; analyzing the first and second set of I/O activity data; and based on the analysis and the performance characteristics associated with the second data storage tier, determining whether the data group should be migrated to the second data storage tier.

Managing tiering in cache-based systems

A method and system for use in managing data storage is disclosed. Data storage in a data storage system is managed. The data storage system comprises a first data storage tier and a second data storage tier configured such that the performance characteristics associated with one of the data storage tiers is superior to the other data storage tier. I/O activity is determined in connection with a data group stored on one of the first and second data storage tiers. It is determined whether to migrate the data group stored on the one of the first and second data storage tiers to the other data storage tier based on the performance characteristics associated with the other data storage tier and the determined I/O activity. The data group is migrated to the other data storage tier in response to determining to migrate the data group to the other data storage tier. The data group is processed in response to determining to migrate the data group to the other data storage tier such that fragmentation in connection with the data group is substantially reduced.

Managing data storage

A method, system, and program product comprising, assigning addressable elements of storage devices of a data storage system to groups and subgroups, each subgroup being a member of a respective group of the groups, associating a value with a first group of the groups, wherein the value is derived from attributes of access requests to addressable elements of only a subset of the subgroups that are members of the first group, and based on the value, migrating data of the first group.

Facilitating data migration between tiers

Systems, methods, and computer readable media for an adaptive block allocation mechanism are disclosed. According to one aspect, a method for allocating slices of storage in a storage medium based on scores is disclosed. The method occurs at a storage processor for controlling access to a storage medium divided into a plurality of logical slices of storage. The method includes determining one or more scores associated with one or more slices. Determining one or more scores includes combining plural dissimilar characteristics of the slice into a single value. The method further includes receiving a slice allocation request, and in response to the slice allocation request, selecting a slice for allocation using the scores.

Systems, methods, and computer readable media for an adaptative block allocation mechanism

According to one aspect, the subject matter described herein includes a method for controlling prioritization of tiering and spin down features in a data storage system. The method is performed at a data storage array comprising a plurality of physical data storage disks for storing data and includes identifying data that is infrequently accessed. The infrequently accessed data is relocated to a subset of the physical data storage disks designated for storing infrequently accessed data and the spin rate of the subset of the disks is reduced.

Methods, systems, and computer readable medium for controlling prioritization of tiering and spin down features in a data storage system

A method is used in managing cache pages. A location pointer is maintained in a dynamic list of entries for cache page cleaning. The dynamic list includes a list of cache pages ordered from most recently used to least recently used. Based on flags associated with the cache pages, a count of the number of cache pages processed for cache page cleaning is maintained. In response to a change in the dynamic list, the location pointer and count are updated based on the processing status of an entry to which the change pertains.

Managing a dynamic list of entries for cache page cleaning

A method is used in measuring data access activity. I/O data is analyzed that describes I/O activity for a slice of a logical volume. Based on the I/O data, a first value of data access activity is determined for the slice corresponding to a first time period, and a second value of data access activity is determined corresponding to a second time period. From the first and second values, an exponential moving average of data access activity is derived for the slice.

Measuring data access activity

A method is used in managing compression in data storage systems. A data temperature is determined for a set of data in a block-based data storage system. Based on the data temperature, data compression is applied to the set of data.

Managing compression in data storage systems

Methods and systems are disclosed for relocating data in a physical storage pool comprising a plurality of storage tiers having differing performance characteristics, the physical storage pool being mapped into one or more logical units, each logical unit comprising a plurality of logical slices of data storage. The methods and systems can involve receiving a relocation list, the relocation list including, for each of a plurality of logical slices, a slice identifier, a temperature value, and a current physical location, determining a destination tier for each logical slice on the relocation list, evaluating for each logical slice on the relocation list a performance gain expected to be achieved by moving the logical slice from its current physical location to a new location in the destination tier, and relocating data in a logical slice from its current physical location to the new location based on the evaluation.

Automated data relocation among storage tiers based on storage load

A method is used in applying data access activity measurements. A slice relocation candidate list is generated which identifies slices to be relocated along with respective destination tier information. Slices in a pool are matched to respective matching tiers based on the slices' respective temperatures and tier preferences. Based on whether a current tier for a slice differs from the matching tier for the slice, the slice is listed in the relocation candidate list.

Applying data access activity measurements

A system and method provides for establishing a direct TCP/IP connection between a workstation and a storage system independent of a server to which the storage system is connected. A SCSI request is encoded with tags identifying the request as a SCSI request, and the request is structured with a request IP identification. The tagged SCSI request is then sent to the storage system, and the request IP identification of the SCSI request is returned from the target device to the workstation to thereby allow exchange of SCSI requests over a TCP/IP connection directly between the workstation and the storage system, independent of involving the server.

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Efland, NC, United States of America

Dean D Throop