Method, device and computer program product for managing storage system

Patent metadata

Field	Value
Publication number	US-11003556-B2
Application number	US-201816216344-A
Country	US
Kind code	B2
Filing date	Dec 11, 2018
Priority date	Apr 28, 2018
Publication date	May 11, 2021
Grant date	May 11, 2021

Abstract

State information of one or more extents in a stripe in a storage system is obtained, the state information indicating whether the extents comprise at least one of a failed extent and an end-of-life extent. A risk level for the stripe is determined based on the state information, the risk level indicating a possibility that data stored in the stripe is lost. In response to the risk level exceeding a first threshold, the storage system is caused to: rebuild data corresponding to the failed extent, and write the data to a sparing extent in a second storage device different from a first storage device where the failed extent resides; and write data corresponding to the end-of-life extent to a swapped extent in a fourth storage device different from a third storage device where the end-of-life extent resides, the fourth storage device being used to replace the third storage device.

First claim

We claim:

1. A method for managing a storage system, the method comprising:
obtaining state information of one or more extents in a single stripe in the storage system, the state information indicating whether the extents comprise at least one of a failed extent and an end-of-life extent, wherein obtaining the state information comprises obtaining, at a predefined time interval, the state information from a record storing the state information;
determining a risk level for the stripe based on the state information, the risk level indicating a possibility that data stored in the stripe is lost, wherein determining the risk level includes, in response to the state information indicating the extents comprise both a failed extent and an end-of-life extent, determining the risk level exceeds a first threshold; and
in response to the risk level exceeding the first threshold, causing the storage system to:
rebuild data corresponding to the failed extent, and write the data to a sparing extent in a second storage device different from a first storage device where the failed extent resides, wherein the first storage device comprises a failed storage device; and
write data corresponding to the end-of-life extent to a swapped extent in a fourth storage device different from both the second storage device and a third storage device where the end-of-life extent resides, the third storage device comprising a storage device that is marked as end-of-life that is different from the first storage device, and the fourth storage device being used to replace the third storage device;

wherein responsive to the risk level exceeding the first threshold, the storage system is caused to rebuild the data corresponding to the failed extent and write the rebuilt data to the sparing extent in the second storage device concurrently with the write of the data corresponding to the end-of-life extent to the swapped extent in the fourth storage device.

2. The method according to claim 1 , wherein determining the risk level further comprises:
in response to the state information indicating the extents only comprise a failed extent, determining the risk level is below the first threshold and exceeds a second threshold; and
in response to the state information indicating the extents only comprise an end-of-life extent, determining the risk level is below the second threshold.

3. The method according to claim 1 , further comprising:
in response to the risk level being below the first threshold and exceeding a second threshold, causing the storage system to rebuild data corresponding to the failed extent and write the data to the sparing extent.

4. The method according to claim 1 , further comprising:
in response to the risk level being below a second threshold, causing the storage system to write data corresponding to the end-of-life extent to the swapped extent.

5. A device for managing a storage system, comprising:
at least one processor;
a memory coupled to the at least one processor, the memory having instructions stored thereon, the instructions, when executed by the at least one processor, causing the device to perform acts, the acts comprising:
obtaining state information of one or more extents in a single stripe in the storage system, the state information indicating whether the extents comprise at least one of a failed extent and an end-of-life extent, wherein obtaining the state information comprises obtaining, at a predefined time interval, the state information from a record storing the state information;
determining a risk level for the stripe based on the state information, the risk level indicating a possibility that data stored in the stripe is lost, wherein determining the risk level includes, in response to the state information indicating the extents comprise both a failed extent and an end-of-life extent, determining the risk level exceeds the first threshold; and
in response to the risk level exceeding the first threshold, causing the storage system to:
rebuild data corresponding to the failed extent, and write the data to a sparing extent in a second storage device different from a first storage device where the failed extent resides, wherein the first storage device comprises a failed storage device; and
write data corresponding to the end-of-life extent to a swapped extent in a fourth storage device different from both the second storage device and a third storage device where the end-of-life extent resides, the third storage device comprising a storage device that is marked as end-of-life that is different from the first storage device, and the fourth storage device being used to replace the third storage device;

wherein responsive to the risk level exceeding the first threshold, the storage system is caused to rebuild the data corresponding to the failed extent and write the rebuilt data to the sparing extent in the second storage device concurrently with the write of the data corresponding to the end-of-life extent to the swapped extent in the fourth storage device.

6. The device according to claim 5 , wherein determining the risk level further comprises:
in response to the state information indicating the extents only comprise a failed extent, determining the risk level is below the first threshold and exceeds a second threshold; and
in response to the state information indicating the extents only comprise an end-of-life extent, determining the risk level is below the second threshold.

7. The device according to claim 5 , the acts further comprising:
in response to the risk level being below the first threshold and exceeding a second threshold, causing the storage system to rebuild data corresponding to the failed extent and write the data to the sparing extent.

8. The device according to claim 5 , the acts further comprising:
in response to the risk level being below a second threshold, causing the storage system to write data corresponding to the end-of-life extent to the swapped extent.

9. A computer program product having a non-transitory computer readable medium which stores a set of instructions to manage a storage system; the set of instructions, when carried out by computerized circuitry, causing the computerized circuitry to perform a method of:
obtaining state information for a set of extents in a single stripe in the storage system, the state information indicating whether the extents comprise at least one of a failed extent and an end-of-life extent, wherein obtaining the state information comprises obtaining, at a predefined time interval, the state information from a record storing the state information;
determining a risk level for the stripe based on the state information, the risk level indicating a possibility that data stored in the stripe is lost, wherein determining the risk level includes, in response to the state information indicating the extents comprise both a failed extent and an end-of-life extent, determining the risk level exceeds a first threshold; and
in response to the risk level exceeding the first threshold, causing the storage system to:
rebuild data corresponding to the failed extent, and write the data to a sparing extent in a second storage device different from a first storage device where the failed extent resides, wherein the first storage device comprises a failed storage device; and
write data corresponding to the end-of-life extent to a swapped extent in a fourth storage device different from both the second storage device and a third storage device where the end-of-life extent resides, the third storage device comprising a storage device that is marked as end-of-life that is different from the first storage device, and the fourth storage device being used to replace the third

Assignees

• Emc Ip Holding Co Llc

Inventors

• Ma Chun
• Han Geng
• Dong Jibing
• Gao Hongpo
• Gao Jian
• Xu Xinlei

Classifications

• G06F3/0616

  in relation to life time, e.g. increasing Mean Time Between Failures [MTBF] · CPC title

• G06F11/1092

  Rebuilding, e.g. when physically replacing a failing disk · CPC title

• G06F11/008 Primary

  Reliability or availability analysis · CPC title

• G06F3/064

  Management of blocks · CPC title

• G06F11/1076

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