Efficient relocation of data between storage devices of a storage system

Patent metadata

Field	Value
Publication number	US-2020082890-A1
Application number	US-201916547401-A
Country	US
Kind code	A1
Filing date	Aug 21, 2019
Priority date	Sep 6, 2018
Publication date	Mar 12, 2020
Grant date	—

Abstract

A storage system includes a plurality of solid-state storage devices and a storage controller operatively coupled to the plurality of solid-state storage devices, the storage controller including a processing device, the processing device to receive, from a first solid-state storage device of the plurality of solid-state storage devices, an indication that data stored at the first solid-state storage device is affected by read disturb. In response to receiving the indication, the processing device is further to identify a second solid-state storage device of the plurality of solid-state storage devices for the relocation of the data and transmit, to the first solid-state storage device, a command comprising information associated with the relocation of the data from the first solid-state storage device to the second solid-state storage device, wherein the command causes the first solid-state storage device to relocate the data to the second solid-state storage device.

First claim

What is claimed is:

1 . A storage system comprising:
a plurality of solid-state storage devices; and a storage controller operatively coupled to the plurality of solid-state storage devices, the storage controller comprising a processing device, the processing device to:
receive, from a first solid-state storage device of the plurality of solid-state storage devices, an indication that data stored at the first solid-state storage device is affected by read disturb;
in response to receiving the indication, identify a second solid-state storage device of the plurality of solid-state storage devices for the relocation of the data; and
transmit, to the first solid-state storage device, a command comprising information associated with the relocation of the data from the first solid-state storage device to the second solid-state storage device, wherein the command causes the first solid-state storage device to relocate the data to the second solid-state storage device.

2 . The storage system of claim 1 , wherein the information associated with the relocation of the data comprises one or more transformation operations to be performed on the data and wherein the one or more transformation operations comprise at least one of de-encryption of the data, encryption of the data, a format change of the data or a modification to encoded metadata associated with the data.

3 . The storage system of claim 1 , wherein the data is transmitted from the first solid-state storage device to the second solid-state storage device via a mesh network or a network switch.

4 . The storage system of claim 1 , wherein the processing device is further to:
receive, from the second solid-state storage device, an acknowledgment that the data has been relocated; and in response to receiving the acknowledgment, update a mapping data structure to deallocate the data stored at the first solid-state storage device and associate the data with the second solid-state storage device.

5 . The storage system of claim 1 , wherein the command comprising the information associated with the relocation of the data comprises an identification of the data stored in an encrypted segment of data, wherein the command causes the first solid-state storage device to decrypt the encrypted segment and extract the data from the encrypted segment.

6 . The storage system of claim 1 , wherein the relocation of the data from the first solid-state storage device to the second solid-state storage device is associated with an accelerated garbage collection operation.

7 . The storage system of claim 1 , wherein the data being affected by read disturb comprises at least one of:
a read count associated with the data satisfying a read count threshold; an error rate associated with the data satisfying an error rate threshold; or an amount of time associated with the data satisfying a time threshold.

8 . A method, comprising:
receiving, by a processing device from a first solid-state storage device of a plurality of solid-state storage devices, an indication that data stored at the first solid-state storage device is affected by read disturb; in response to receiving the indication, identifying a second solid-state storage device of the plurality of solid-state storage devices for the relocation of the data; and transmitting, to the first solid-state storage device, a command comprising information associated with the relocation of the data from the first solid-state storage device to the second solid-state storage device, wherein the command causes the first solid-state storage device to relocate the data to the second solid-state storage device.

9 . The method of claim 8 , wherein the information associated with the relocation of the data comprises one or more transformation operations to be performed on the data and wherein the one or more transformation operations comprise at least one of de-encryption of the data, encryption of the data, a format change of the data or a modification to encoded metadata associated with the data.

10 . The method of claim 8 , wherein the data is transmitted from the first solid-state storage device to the second solid-state storage device via a mesh network or a network switch.

11 . The method of claim 8 , further comprising:
receiving, from the second solid-state storage device, an acknowledgment that the data has been relocated; and in response to receiving the acknowledgment, updating a mapping data structure to deallocate the data stored at the first solid-state storage device and associate the data with the second solid-state storage device.

12 . The method of claim 8 , wherein the command comprising the information associated with the relocation of the data comprises an identification of the data stored in an encrypted segment of data, wherein the command causes the first solid-state storage device to decrypt the encrypted segment and extract the data from the encrypted segment.

13 . The method of claim 8 , wherein the relocation of the data from the first solid-state storage device to the second solid-state storage device is associated with an accelerated garbage collection operation.

14 . The method of claim 8 , wherein the data being affected by read disturb comprises at least one of:
a read count associated with the data satisfying a read count threshold; an error rate associated with the data satisfying an error rate threshold; or an amount of time associated with the data satisfying a time threshold.

15 . A non-transitory computer readable storage medium storing instructions, which when executed, cause a processing device to:
receive, from a first solid-state storage device of a plurality of solid-state storage devices, an indication that data stored at the first solid-state storage device is affected by read disturb; in response to receiving the indication, identify a second solid-state storage device of the plurality of solid-state storage devices for the relocation of the data; and transmit, to the first solid-state storage device, a command comprising information associated with the relocation of the data from the first solid-state storage device to the second solid-state storage device, wherein the command causes the first solid-state storage device to relocate the data to the second solid-state storage device.

16 . The non-transitory computer readable storage medium of claim 15 , wherein the information associated with the relocation of the data comprises one or more transformation operations to be performed on the data and wherein the one or more transformation operations comprise at least one of de-encryption of the data, encryption of the data, a format change of the data or a modification to encoded metadata associated with the data.

17 . The non-transitory computer readable storage medium of claim 15 , wherein the data is transmitted from the first solid-state storage device to the second solid-state storage device via a mesh network or a network switch.

18 . The non-transitory computer readable storage medium of claim 15 , wherein the processing device is further to:
receive, from the second solid-state storage device, an acknowledgment that the data has been relocated; and in response to receiving the acknowledgment, update a mapping data structure to deallocate the data stored at the first solid-state storage device and associate the data with the second solid-state storage device.

19 . The non-transitory computer readable storage medium of claim 15 , wherein the command comprising the in

Assignees

• Pure Storage Inc

Inventors

• Karr Ronald
• Bernat Andrew R
• Tang Wei

Classifications

• G06F11/1076 Primary

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

• G11C16/26

  Sensing or reading circuits; Data output circuits · CPC title

• G11C16/3418 Primary

  Disturbance prevention or evaluation; Refreshing of disturbed memory data · CPC title

• G06F12/0253

  Garbage collection, i.e. reclamation of unreferenced memory · CPC title

• G06F11/076

  by exceeding a count or rate limit, e.g. word- or bit count limit · CPC title