Method, system and computer program product for managing storage system
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: obtaining topological information of a storage device in a first tier and a storage device in a second tier in the storage system; obtaining a storage rule specifying storage of a data object in the storage device in the first tier or the storage device in the second tier; and in response to determining the storage rule conforming to the topological information, managing the data object in the storage system according to the storage rule. In other implementations of the present disclosure, there is provided a corresponding system and computer program product.
1. A method for managing a storage system, the method comprising:
obtaining topological information of a first storage device in a first tier and a second storage device in a second tier in the storage system;
obtaining a storage rule specifying storage of a data object in the first storage device in the first tier or the second storage device in the second tier; and
in response to determining the storage rule conforming to the topological information, managing the data object in the storage system according to the storage rule;
wherein:
the storage system includes a plurality of storage devices including the first storage device and the second storage device;
the storage system includes a plurality of tiers including the first tier and the second tier; and
the topological information describes a dynamic mapping relationship between each storage device of the plurality of storage devices and the storage system, the dynamic mapping relationship defining a particular tier to which each storage device of the plurality of storage devices belongs.
2. The method according to claim 1 , wherein the determining the storage rule conforming to the topological information comprises:
in response to the topological information comprising a storage device in a tier specified by the storage rule, determining the storage rule conforming to the topological information.
3. The method according to claim 1 , wherein the managing the data object in the storage system according to the storage rule comprises:
in response to receiving a storage request for storing the data object in the storage system, allocating at least one data block for the data object in a storage device in a tier specified by the storage rule; and
inserting an index node to indexes of the storage system, the index node being linked to the at least one data block.
4. The method according to claim 1 , wherein the managing the data object in the storage system according to the storage rule comprises:
monitoring a state of the data object in the storage system; and
in response to the state satisfying the storage rule, migrating the data object in the storage system on the basis of a source tier and a destination tier specified by the storage rule.
5. The method according to claim 4 , wherein storage devices in the source tier and the destination tier have different response efficiency respectively, and the migrating the data object comprises:
in response to access to the data object satisfying a first predefined condition in the storage rule, migrating the data object from a storage device in the source tier to a storage device in the destination tier.
6. The method according to claim 4 , wherein storage devices in the source tier and the destination tier have different response efficiency respectively, and the migrating the data object comprises:
in response to a size of the data object satisfying a second predefined condition in the storage rule, migrating the data object from a storage device in the source tier to a storage device in the destination tier.
7. The method according to claim 6 , wherein the migrating the data object comprises:
creating a temporary node in a cache of the storage system;
copying contents of the data object from a storage device in the source tier to at least one data block in a storage device in the destination tier;
linking the temporary node to the at least one data block; and
copying contents in the temporary node to an index node associated with the data object among indexes of the storage system.
8. The method according to claim 7 , further comprising:
locking the data object during copying the data object.
9. The method according to claim 7 , wherein the copying contents in the temporary node further comprises:
releasing a data block to which the index node points; and
copying contents in the temporary node to the index node.
10. The method according to claim 4 , wherein the migrating the data object in the storage system on the basis of a source tier and a destination tier specified by the storage rule comprises:
in response to the data object being “dirty data,” synchronizing data associated with the data object in a cache of the data object to the data object; and
migrating the data object from a storage device in the source tier to a storage device in the destination tier.
11. The method according to claim 1 wherein:
each storage rule makes reference to a set of one or more tiers;
obtaining the storage rule includes identifying all tiers referenced by the storage rule; and
determining the storage rule conforming to the topological information includes, for each tier referenced by the storage rule, determining that the dynamic mapping relationship defines at least one storage device as belonging to that tier.
12. A system for managing a storage system, comprising:
one or more processors;
a memory coupled to at least one processor of the one or more processors; and
computer program instructions stored in the memory which, when executed by the at least one processor, cause the system to execute a method for managing the storage system, the method comprising:
obtaining topological information of a first storage device in a first tier and a second storage device in a second tier in the storage system;
obtaining a storage rule specifying storage of a data object in the first storage device in the first tier or the second storage device in the second tier; and
in response to determining the storage rule conforming to the topological information, managing the data object in the storage system according to the storage rule;
wherein:
the storage system includes a plurality of storage devices including the first storage device and the second storage device;
the storage system includes a plurality of tiers including the first tier and the second tier; and
the topological information describes a dynamic mapping relationship between each storage device of the plurality of storage devices and the storage system, the dynamic mapping relationship defining a particular tier to which each storage device of the plurality of storage devices belongs.
13. The system according to claim 12 , wherein the determining the storage rule conforming to the topological information comprises:
in response to the topological information comprising a storage device in a tier specified by the storage rule, determining the storage rule conforming to the topological information.
14. The system according to claim 12 , wherein the managing the data object in the storage system according to the storage rule comprises:
in response to receiving a storage request for storing the data object in the storage system, allocating at least one data block for the data object in a storage device in a tier specified by the storage rule; and
inserting an index node to indexes of the storage system, the index node being linked to the at least one data block.
15. The system according to claim 12 , wherein the managing the data object in the storage system according to the storage rule comprises:
monitoring a state of the data object in the storage system; and
in response to the state satisfying the storage rule, migrating the data object in the storage system on the basis of a source tier and a destination tier specified by the storage rule.
16. The system according to claim 15 , wherein storage devices in the source tier and the destination tier have different response efficiency respectively, and the migrating the data object comprises:
in response to access to the data object satisfying a first predefined condition in the storage rule, migrating the data object from a storage device in the source tier to a storage device in the destination tier.
17. The system according to claim 15 , wherein storage devices in the source tier and the destination tier have different response efficiency, and the migrating the data object comprises:
in response to a size of the data object satisfying a second predefined condition in the storage rule, migrating the data object from a storage device in the source tier to a storage device in the destination tier.
18. The system according to claim 17 , wherein the migrating the data object comprises:
creating a temporary node in a cache of the storage system;
copying contents of the data object from a storage device in the source tier to at least one data block in a storage device in the destination tier;
linking the temporary node to the at least one data block; and
copying contents in the temporary node to an index node associated with the data object among indexes of the storage system.
19. The system according to claim 18 , wherein the method further comprises:
locking the data object during copying the data object.
20. The system according to claim 18 , wherein the copying contents in the temporary node further comprises:
releasing a data block to which the index node points; and
copying contents in the temporary node to the index node.
21. The system according to claim 15 , wherein the migrating the data object in the storage system on the basis of a source tier and a destination tier specified by the storage rule comprises:
in response to the data object being “dirty data,” synchronizing data associated with the data object in a cache of the data object to the data object; and
migrating the data object from a storage device in the source tier to a storage device in the destination tier.
22. The system according to claim 12 wherein:
each storage rule makes reference to a set of one or more tiers;
obtaining the storage rule includes identifying all tiers referenced by the storage rule; and
determining the storage rule conforming to the topological information includes, for each tier referenced by the storage rule, determining that the dynamic mapping relationship defines at least one storage device as belonging to that tier.