Google Inc.

Microsoft Technology Licensing, LLC

Agarwal, Amit

Kadatch, Andrew

Sheldon, Michael

Andrew Kadatch

James E Walsh

Sergey Khorun

Jay Judkowitz

Igor Belianski

Amit Agarwal

Michael G Sheldon

Jordan Tigani

Siddartha Naidu

Matthew S Harris

Carl Hamilton

Joseph S Beda, Iii

Lawrence Elias Greenfield

Jeremy P C Condit

Sanjeev Mehrotra

Nadim Y Abdo

Michael V Sliger

Stuart Raymond Patrick

Sandeep Bhatia

Michael A Halcrow

Jeremy P Condit

Andrey Arkharov

Xiaowen Shan

Drew Shaffer Roselli

Anik Sarker

Sergey Korostelev

Justyna Ilczuk

Jeremy PC Condit

A method of resizing a block storage volume for a virtual machine includes executing the virtual machine and attaching a virtual storage device to the virtual machine. The virtual storage device exposes the block storage volume on memory hardware to the virtual machine. The block storage volume includes a first storage capacity. The method also includes mounting the block storage volume to the virtual machine and resizing the block storage volume while the virtual machine continues to execute. The block storage volume is resized without attaching an additional virtual storage device to the virtual machine or mounting an additional block storage volume to the virtual machine.

Hot growing a cloud hosted block device

Data log-base logical block devices are used to control parameter-based versioning at a block-device level. Memory in the block device stores data log indicating data and corresponding metadata, the metadata indicating a particular historical time. The block device may receive a request, such as a remote procedure call (RPC), for data from the logical block device, and identify data included in the data log having metadata that matches or satisfies a historical time parameter included in and extracted from the request.

Parameter-based versioning for log-based block devices

In general, the subject matter described in this disclosure can be embodied in methods, systems, and program products. A system includes a first data center, a second data center, and a third data center. The multiple data centers are configured to replicate a logical collection of data that comprises multiple logical partitions of data. The system comprises a first writing subsystem that is designated to write updates to a copy of a first logical partition of data that is stored by the first data center. The system comprises a second writing subsystem that is designated to write updates to a copy of a second logical partition of data that is stored by the second data center. The system comprises a third writing subsystem that is designated to write updates to a copy of a third logical partition of data that is stored by the third data center.

Data processing service

Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for virtual block storage. In one aspect, a method includes receiving a request to initialize a virtual machine, the virtual machine having an associated virtual block device; accessing a file map comprising a plurality of file map entries; determining file map entries corresponding to blocks of data allocated to the virtual block device and one or more files in which the blocks of data allocated to the virtual block device are stored; determining that a particular one of the blocks allocated to the virtual block device has been written to a new position not associated with the particular block in the file map; and updating the position associated with the particular block to the new position.

Virtual block devices

Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for compressing file maps. In one aspect, a method includes accessing a file maintained by a file system that manages access to a block device. The file includes a plurality of active blocks associated with a respective logical block number and a respective block index. The method also includes assigning a file index to the file, analyzing the file to determine a maximum block index and a minimum block index, and identifying runs of blocks in the plurality of active blocks. Each run of blocks includes a respective start block. For each of the runs of blocks, the method includes identifying a respective length. For each start block, the method includes generating a file map entry for each start block. The method also includes storing the file map entries in a file map.

File map compression using run length encoding for active blocks

In general, one aspect of the subject matter described in this specification can be embodied in methods that include receiving, at a computer system, a request to create a snapshot of a virtual storage device, wherein the virtual storage device virtually stores data at virtual addresses, the data being physically stored at a plurality of physical storage locations that are managed by an underlying storage system associated with virtual storage device. The methods can further include identifying, by the computer system, one or more regions of the virtual storage device that have been written to since a previous snapshot of the virtual storage device was created. The methods can additionally include generating a unique identifier for the requested snapshot; and creating the requested snapshot using the identified one more regions and the unique identifier.

Providing snapshots of virtual storage devices

Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for storing data on storage nodes. In one aspect, a method includes receiving a file to be stored across a plurality of storage nodes each including a cache. The is stored by storing portions of the file each on a different storage node. A first portion is written to a first storage node's cache until determining that the first storage node's cache is full. A different second storage node is selected in response to determining that the first storage node's cache is full. For each portion of the file, a location of the portion is recorded, the location indicating at least a storage node storing the portion.

Storing data across a plurality of storage nodes

Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for managing resources in a computing system. For virtual hard disk drives supported by multiple physic hard disk drives over a network, artificial throttling of the disk access bandwidth is implemented, such that the resulting latency behavior of each virtual hard disk drive resembles the latency behavior of a corresponding physical hard disk drive emulated by the virtual hard disk drive. In various implementations, the artificial throttling simulates both characteristics of sequential access latencies and random access latencies on a physical hard drive.

Bandwidth throttling of virtual disks

Growing community of inventors

Redmond, WA, United States of America

Andrew Kadatch