Emc IP Holding Company LLC

Ree Sun

Shaoqin Gong

Hongpo Gao

Jian Gao

Jamin Jianbin Kang

Jibing Dong

Xinlei Xu

Geng Han

Baote Zhuo

Wayne Li

Qingyun Liu

Lili Chen

Huadong Li

Vamsi K Vankamamidi

Ruiyong Jia

Changyu Feng

Liam Xiongcheng Li

Naizhong Chiu

Ilya Usvyatsky

Charles Ma

A method of initializing a data storage system (DSS) is provided. The method includes (a) in response to the DSS booting, reading data from a first plurality of disks marked as part of a raw mirror which mirrors configuration data of the DSS between the first plurality of disks; (b) comparing sequence numbers from the read data read and selecting data from a disk of the first plurality having a latest sequence number; (c) obtaining configuration data of the DSS from the selected data; (d) using the configuration data to construct a topology of the DSS which includes information describing a relationship between a second plurality of disks of the DSS, RAID groups of the DSS, and logical disks presented to users, the second plurality of disks being larger than and including the first plurality of disks; and (e) initializing the RAID groups and the logical disks described by the topology based on the information of the topology.

Using a raw mirror to initialize a storage system

A method of managing storage resources is provided. The method includes (a) storing data in an array of storage extents on respective storage drives of a plurality of storage drives, the array of storage extents having a first level of redundancy; and (b) in accordance with a storage management policy, adjusting the array of storage extents to have a second level of redundancy by changing the array of storage extents from having a first number of storage extents on respective storage drives to having a second number of storage extents on respective storage drives, the second level of redundancy providing a different tolerance for failure than the first level of redundancy. An apparatus, system, and computer program product for performing a similar method are also provided.

Dynamically adjusting redundancy levels of storage stripes

Embodiments of the present disclosure provide method, device and computer program product for managing a storage system. The storage system includes a disk having a plurality of extents. The method comprises obtaining metadata associated with an RAID stripe in a first RAID of a first type, the first RAID including at least a part of extents from the plurality of extents. The method also comprises allocating an additional extent to the RAID stripe. The method further comprises converting, based on the allocated additional extent and by modifying the metadata, the first RAID of the first type into a second RAID of a second type in a degraded mode. Additionally, the method comprises initiating, based on the modified metadata, a rebuilding process for the second RAID, so as to convert the second RAID from the degraded mode to a normal mode.

Method, device and computer program product for managing a storage system

The present disclosure provides a storage management method, a device and a computer-readable medium. The method comprises: receiving a request for creating a storage space, the request at least comprising a storage capacity and a RAID configuration of the storage space, the RAID configuration at least indicating a RAID type; allocating an extent based on the storage capacity; creating a RAID group for the extent based on the RAID type; and storing metadata of the RAID group in the extent, the metadata indicating a configuration of the RAID group and a configuration of a user data region in the extent.

Storage management method, device and computer-readable medium

Various embodiments of the present disclosure generally relate to a method and a device for managing a hybrid storage disk array. Specifically, the method can include: in response to a first data portion of a first extent in a first set of extents of a first type of storage disk being unavailable, obtaining a metadata portion of a second extent in a second set of extents of the second type of storage disk. The method can also include: reading from the metadata portion reconstruction information for reconstructing the first data portion; and reconstructing, based on the reconstruction information, the first data portion on a third extent in the first set of extents. In addition, there is also provided accordingly a system, an apparatus and a computer program product.

Method and device for managing a hybrid storage disk array

Implementations of the present disclosure relate to a method, system and computer program product for managing a storage system. Specifically, in one implementation of the present disclosure there is provided a method for managing a storage system. The method comprises: dividing a source device among a plurality of storage devices in the storage system into a plurality of extents; copying data in the plurality of extents to a destination device; determining the state of an extent among the plurality of extents on the basis whether data in the extent among the plurality of extents has been copied to the destination device; and managing an access request to the extent on the basis of the state of the extent. In other implementations of the present disclosure, there is provided a corresponding system and computer program product.

Method, system, and computer program product for managing storage system

Embodiments of the present disclosure provide methods and apparatuses for ensuring data consistency. In some embodiments, a method comprises writing data into a first temporary buffer in a first processor. The method further comprises, in response to the data being written into the first temporary buffer, sending the data to a second processor to update a copy of the data in the second processor. In addition, the method comprises, in response to receiving an indication that the second processor has received the data, copying the data from the first temporary buffer to a first working buffer in the first processor.

Method and apparatus for ensuring data consistency

Implementations of the present disclosure relate to a method, system and computer program product for managing a storage system. Specifically, in one implementation of the present disclosure there is provided a method for managing a storage system. The storage system comprises at least one stripe, a stripe of the at least one stripe comprising multiple extents among which respective extents being from respective storage devices in a resource pool. The method comprises: in response to receiving a converting request to convert the storage system from a first type to a second type, determining a target storage device associated with the converting request in the resource pool; for a stripe of the at least one stripe, updating metadata associated with the stripe so as to remove from the stripe an extent that is located at the target storage device; and converting the storage system from the first type to the second type on the basis of the updated metadata. In other implementations of the present disclosure, there is provided a corresponding system and computer program product.

Changing data reliability type within a storage system

A method and device for storage management comprising: in response to receiving a request for creating an extent pool, creating the extent pool at least on a user disk, the extent pool comprising a plurality of disk extents; storing data in at least one disk extent of the plurality of disk extents; and storing address information for locating the at least one disk extent in a system disk communicably connected to the user disk. Through the technical solution of the present disclosure, the user can store metadata associated with RAID in the user disk and load metadata associated with RAID from the user disk so as to reduce the access and load of the system disk.

Method and device for storage management with metadata stored in disk extents in an extent pool

Implementations of the present disclosure relate to a method and apparatus for handling an error for a drive. The logic space of the drive is divided into a plurality of extents. The method comprises determining a type of errors in response to the errors detected in I/O operations for the drive. The method further comprises determining a drive extent of the plurality of extents of the drive that causes the errors in response to determining that the type of the errors is a soft medium error or a data error, the soft medium error being an error that can be repaired by re-mapping of a failed extent and the data error being an error that is caused by damage of data on the drive. Furthermore, the errors can be handled only with respect to the drive extent that causes the errors.

Techniques for handling drive errors based on extents causing the drive errors

Embodiments of the present disclosure relate to a method, a device and a computer program product for managing a storage system. According to embodiments of the present disclosure, the method comprises, in response to a certain disk of a disk array of the storage system returning from a failed state to a normal state, determining information of a spare disk for recovering data on the storage disk, the first data being stored on the first disk. The method further comprises determining based at least in part on information of the spare disk, a disk from the spare disk and a first disk for reconstructing the disk array. According to embodiments of the present disclosure, in the case that the first disk is recovered from the failed state, the method comprises based on a data amount in the spare disk having not been recovered yet and a data amount associated with the first disk, selecting the spare disk or the first disk for data reconstruction. With the method according to embodiments of the present disclosure, the time for reconstructing a disk array will be reduced effectively.

Embodiments of the present disclosure provide a method of managing a redundant array of independent disks (RAID) system and an electronic device. The method includes configuring a plurality of disks in the RAID system as a raw mirror for storing configuration data of the RAID system; storing metadata for the raw mirror in the plurality of disks, the metadata stored in each of the plurality disks including an identifier identifying that the disk belongs to the raw mirror and a sequence number identifying a writing operation for a block storing the metadata in the disk; and controlling reading and writing of the raw mirror based on the metadata.

Operating a raw mirror within a RAID system

A method, computer program product, and computer system for selecting, by a computing device, a first disk extent for each RAID extent in an extent pool. Remaining disk extents for each RAID extent in the extent pool may be selected.

Dynamic programming based extent selection for hybrid capacity extent pool system and method

A method, computer program product, and computer system for receiving, by a computing device, an I/O request for data. A number of storage devices of a plurality of storage devices in a Mapped RAID group that will be used to process the I/O request may be determined. It may be determined that an amount of I/O credits available for the number of storage devices is insufficient. The amount of I/O credits available for the number of storage devices to process the I/O request may be tuned dynamically based upon, at least in part, determining that the amount of I/O credits available for the number of storage devices is insufficient.

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Beijing, China

Ree Sun