Method, electronic device, and computer program product for managing storage system
Provided herein is a method, an electronic device, and a computer program product for managing a storage system. A method can comprise, in response to determining that a first storage unit of a storage system is faulty, writing, by a system comprising a processor, a data block stored in the first storage unit into a hidden file of the storage system. The hidden file can be distributed across at least a second storage unit and a third storage unit of the storage system, wherein the second storage unit and the third storage unit are different from the first storage unit. Writing the data block can comprise creating the hidden file in the storage system, and creating an index information item corresponding to the data block for the hidden file, which index information item indicates a physical address of the data block.
1. A method, comprising:
in response to determining that a first storage unit of a storage system is faulty, writing, by a system comprising a processor, a first data block stored in the first storage unit into a hidden file of the storage system, wherein the hidden file is distributed across at least a second storage unit and a third storage unit of the storage system; and
storing, for a data block at each of the second storage unit and the third storage unit, in an associative manner in a mapping table in the storage system, an identifier of the first storage unit and an index information item corresponding to the respective data block for the hidden file, wherein the index information item comprises identification information of the hidden file and offset position information of the data block in the hidden file at the respective second storage unit or third storage unit.
2. The method according to claim 1 , wherein writing the first data block into the hidden file comprises:
creating the hidden file in the storage system, wherein each index information item further indicates a first physical address of the respective data block written into the hidden file in the storage system.
3. The method according to claim 1 , further comprising:
in response to determining that the first data block has been written into the hidden file,
searching the mapping table for the identifier of the first storage unit in response to an updating of the first storage unit; and
writing, based on the index information item associated with the identifier in the mapping table, the first data block at the first physical address indicated by the index information item into the first storage unit.
4. The method according to claim 3 , further comprising:
updating the first storage unit, wherein the updating comprises at least one of:
repairing the first storage unit, or
replacing the first storage unit.
5. The method according to claim 1 , wherein writing the first data block stored in the first storage unit into the hidden file comprises:
reconstructing the first data block stored in the first storage unit, resulting in a reconstructed first data block; and
writing the reconstructed first data block into the hidden file.
6. The method according to claim 1 , further comprising at least one of:
writing a redundant data block of the first data block into the hidden file; or
storing the identifier of the first storage unit in the hidden file.
7. The method according to claim 2 , further comprising:
after the first data block is written into the hidden file, replacing a second physical address of the first data block recorded in the storage system in the first storage unit with the index information item corresponding to the first data block.
8. A device, comprising:
at least one processor; and
at least one memory storing computer program instructions, the at least one memory and the computer program instructions being configured to cause, together with the at least one processor, the electronic device to perform operations, comprising:
based on determining that a first storage unit of a storage system is faulty, writing a data block stored in the first storage unit into a hidden file of the storage system, wherein the hidden file is distributed across at least a second storage unit and a third storage unit of the storage system, and wherein the hidden file is invisible to storage users of the storage system; and
storing, for a data block at each of the second storage unit and the third storage unit, in an associative manner in a mapping table in the storage system, an identifier of the first storage unit.
9. The device according to claim 8 , wherein writing the data block into the hidden file comprises:
creating the hidden file in the storage system; and
creating an index information item corresponding to the data block for the hidden file, the index information item indicating a first physical address of the data block written into the hidden file in the storage system and offset position information of the data block in the hidden file at the respective second storage unit or third storage unit.
10. The device according to claim 8 , wherein the operations further comprise:
based on determining that the data block has been written into the hidden file,
searching the mapping table for the identifier of the first storage unit in response to an updating of the first storage unit; and
writing, based on the index information item associated with the identifier in the mapping table, the data block at the first physical address indicated by the index information item into the first storage unit.
11. The device according to claim 10 , wherein operations further comprise:
updating the first storage unit, wherein the updating comprises at least one of:
repairing the first storage unit, or
replacing the first storage unit.
12. The device according to claim 8 , wherein writing the data block stored in the first storage unit into the hidden file comprises:
reconstructing the data block stored in the first storage unit, resulting in a reconstructed data block; and
writing the reconstructed data block into the hidden file.
13. The device according to claim 8 , wherein the operations further comprise at least one of:
writing a redundant data block of the data block into the hidden file; or
storing the identifier of the first storage unit in the hidden file.
14. The device according to claim 9 , wherein the operations further comprise:
after the data block is written into the hidden file, replacing a second physical address of the data block recorded in the storage system in the first storage unit with the index information item corresponding to the data block.
15. A non-transitory computer program product stored in a non-volatile computer-readable medium and comprising machine-executable instructions that, when executed by a device, cause the device to execute operations, comprising:
in response to determining that a first storage unit of a storage system is faulty, writing, by a system comprising a processor, a data block stored in the first storage unit into a hidden file of the storage system,
wherein the hidden file is distributed across at least a second storage unit and a third storage unit of the storage system,
storing, for a data block at each of the second storage unit and the third storage unit, in an associative manner in a mapping table in the storage system, an index information item corresponding to the respective data block for the hidden file, wherein the index information item comprises identification information of the hidden file and offset position information of the data block in the hidden file at the respective second storage unit or third storage unit.
16. The non-transitory computer program product according to claim 15 , wherein writing the data block into the hidden file comprises:
creating the hidden file in the storage system,
wherein the index information item further indicates a first physical address of the data block written into the hidden file in the storage system.
17. The non-transitory computer program product according to claim 15 , wherein writing the data block stored in the first storage unit into the hidden file comprises:
reconstructing the data block stored in the first storage unit, resulting in a reconstructed data block; and
writing the reconstructed data block into the hidden file.
18. The non-transitory computer program product according to claim 15 , wherein the operations further comprise at least one of:
writing a redundant data block of the data block into the hidden file; or
storing an identifier of the first storage unit in the hidden file.
19. The method according to claim 5 , further comprising:
after reconstructing the first data block stored in the first storage unit, balancing allocation of storage resources of the first storage unit.
20. The method according to claim 5 , further comprising:
prior to reconstructing the first data block stored in the first storage unit, setting the first storage unit to a pause state to stop other read and write operations to the first storage unit.