Managing storage device mappings in storage systems

Patent metadata

Field	Value
Publication number	US-10073621-B1
Application number	US-201615086593-A
Country	US
Kind code	B1
Filing date	Mar 31, 2016
Priority date	Mar 31, 2016
Publication date	Sep 11, 2018
Grant date	Sep 11, 2018

Abstract

A method is used in managing storage device mappings in storage systems. A set of mappings is created in a distributed storage system. The distributed storage system stores data in a redundant manner at more than one location on a set of storage devices by using a set of stripes. Each stripe of the set of stripes indicates a data slice stored on a storage device. Each mapping of the set of mappings identifies information regarding location of data on a storage device for a stripe. The mapping is stored on the set of storage devices.

First claim

What is claimed is:

1. A method for use in managing storage device mappings in storage systems, the method comprising:
creating a dynamic mapping describing a layout of data across a distributed storage system by creating a set of mappings in the distributed storage system, wherein the distributed storage system stores data in a redundant manner at more than one location on a set of storage devices by using a set of stripes, each stripe of the set of stripes indicating a data slice stored on a storage device of the set of storage devices, wherein each mapping of the set of mappings identifies information regarding location of data on the storage device for a stripe, wherein the dynamic mapping is updated without having to rebuild a storage device of the set of storage devices enabling the distributed storage system to dynamically map any stripe of the set of stripes in a tier across any storage device within the tier and at any offset within the tier, wherein a storage object is presented to a user for storing data on the storage device, wherein the storage object is the tier and includes a set of disk drives, wherein the tier includes a set of uber stripes, each uber stripe of the set of uber stripes describes a storage extent, wherein a set of disk stripes are organized as an uber stripe, wherein a disk stripe is a storage extent created from a set of disk drives, wherein each uber stripe includes a set of RAID stripes, wherein a plan is used for creating the set of mappings, wherein the plan is associated with an uber stripe and describes layout of data on the uber stripe, wherein the plan identifies a set of disk drives of the set of disk drives of the tier and offsets within a specific RAID stripe of the uber stripe, wherein the plan is persistently stored on each disk drive included in the specific RAID stripe; and
storing the mapping on the set of storage devices.

2. The method of claim 1 , wherein a RAID map is used for managing the set of mappings, wherein the RAID map includes a set of plans associated with a set of uber stripes.

3. The method of claim 1 , further comprising:
dynamically changing a mapping of the set of mappings, wherein changing the mapping enables the distributed storage system to map any stripe of the set of stripes within the tier to any offset within the tier.

4. The method of claim 1 , further comprising:
managing the set of mappings by using a device map, wherein the device map is stored persistently on the distributed storage system, wherein the device map includes mapping information for a set of disk drives, wherein the mapping information includes an association of a drive serial number of a disk drive with a drive ID of the disk drive.

5. The method of claim 1 , further comprising:
managing the set of mappings by using a tier table, wherein the tier table is stored persistently on the distributed storage system, wherein the tier table includes information regarding each tier organized on the distributed storage system.

6. The method of claim 1 , further comprising:
managing the set of mappings by using a virtual map, wherein the virtual map includes a set of plans.

7. The method of claim 1 , wherein the distributed storage system further comprises a plurality of Redundant Array of Inexpensive Disks (RAID) systems, each RAID system of the plurality of RAID systems having a first disk drive and a second disk drive.

8. A system for use in managing storage device mappings in storage systems, the system comprising a processor configured to:
create a dynamic mapping describing a layout of data across a distributed storage system by creating a set of mappings in the distributed storage system, wherein the distributed storage system stores data in a redundant manner at more than one location on a set of storage devices by using a set of stripes, each stripe of the set of stripes indicating a data slice stored on a storage device of the set of storage devices, wherein each mapping of the set of mappings identifies information regarding location of data on the storage device for a stripe, wherein the dynamic mapping is updated without having to rebuild a storage device of the set of storage devices enabling the distributed storage system to dynamically map any stripe of the set of stripes in a tier across any storage device within the tier and at any offset within the tier, wherein a storage object is presented to a user for storing data on the storage device, wherein the storage object is the tier and includes a set of disk drives, wherein the tier includes a set of uber stripes, each uber stripe of the set of uber stripes describes a storage extent, wherein a set of disk stripes are organized as an uber stripe, wherein a disk stripe is a storage extent created from a set of disk drives, wherein each uber stripe includes a set of RAID stripes, wherein a plan is used for creating the set of mappings, wherein the plan is associated with an uber stripe and describes layout of data on the uber stripe, wherein the plan identifies a set of disk drives of the set of disk drives of the tier and offsets within a specific RAID stripe of the uber stripe, wherein the plan is persistently stored on each disk drive included in the specific RAID stripe; and
storing the mapping on the set of storage devices.

9. The system of claim 8 , wherein a RAID map is used for managing the set of mappings, wherein the RAID map includes a set of plans associated with a set of uber stripes.

10. The system of claim 8 , further comprising:
dynamically change a mapping of the set of mappings, wherein changing the mapping enables the distributed storage system to map any stripe of the set of stripes within the tier to any offset within the tier.

11. The system of claim 8 , further comprising:
manage the set of mappings by using a device map, wherein the device map is stored persistently on the distributed storage system, wherein the device map includes mapping information for a set of disk drives, wherein the mapping information includes an association of a drive serial number of a disk drive with a drive ID of the disk drive.

12. The system of claim 8 , further comprising:
manage the set of mappings by using a tier table, wherein the tier table is stored persistently on the distributed storage system, wherein the tier table includes information regarding each tier organized on the distributed storage system.

13. The system of claim 8 , further comprising:
manage the set of mappings by using a virtual map, wherein the virtual map includes a set of plans.

14. The system of claim 8 , wherein the distributed storage system further comprises a plurality of Redundant Array of Inexpensive Disks (RAID) systems, each RAID system of the plurality of RAID systems having a first disk drive and a second disk drive.

Assignees

• Emc Corp
• Emc Ip Holding Co Llc

Inventors

• Foley Robert P
• Puhov Peter

Classifications

• G06F3/0689

  Disk arrays, e.g. RAID, JBOD · CPC title

• G06F3/0644

  Management of space entities, e.g. partitions, extents, pools · CPC title

• G06F3/0604 Primary

  Improving or facilitating administration, e.g. storage management · CPC title

• G06F11/1076 Primary

  Parity data used in redundant arrays of independent storages, e.g. in RAID systems · CPC title