Methods and systems to access storage objects
View Patent ↗Methods and systems to access storage objects are provided. A reference to a storage object is used to determine a storage stack level associated with the reference. If the storage stack level is not the lowest level of a storage stack, then the reference is translated to a next stack level reference and passed through to a next stack level associated with the stack. References are translated and passed through iteratively until the lowest level of the stack is reached, wherein an absolute reference to the storage object is obtained and propagated back to an original referencing module, thereby providing access to the storage object.
1. A method for resolving a storage object's absolute location within a first storage environment to grant access to the storage object, comprising:
receiving a request to access a storage object residing on a non-volatile storage device of the first storage environment;
receiving a storage object reference which corresponds to the storage object;
determining an initial storage management stack level associated with the storage object reference;
in response to determining the storage object reference is not an absolute reference, iterating through one or more additional storage management stack levels beginning with the initial stack level, wherein each storage management stack level identifies one or more relative extents of storage objects according to a different level of abstraction; and
translating the storage object reference through each iteration into one or more level-specific relative extents at each storage management stack level until one or more absolute extents are obtained, wherein the one or more absolute extents comprise the storage object's absolute location within the first storage environment.
2. The method of claim 1 , wherein in receiving the storage object reference, the reference is received from a module included in an application programming interface (API) library.
3. The method of claim 2 , wherein in receiving the storage object reference, the reference is obtained from a client module initiating one or more storage-access modules of the API library resulting in the initiation of the module.
4. The method of claim 3 , wherein in receiving the storage object reference, the client module resides in a second storage environment.
5. The method of claim 1 , wherein in determining the initial storage management stack level, a file system and volume manager associated with the first storage environment is identified.
6. The method of claim 5 , wherein in translating the storage reference, the file system and volume manager provide one or more operations to translate the storage reference into one or more of the relative extents and one or more of the absolute extents.
7. The method of claim 1 , wherein the method is provided as one or more modules within an API library.
8. A storage object access system, comprising:
a storage management stack having a plurality of stack levels, wherein the stack levels include a lowest level identifying one or more storage devices of a first storage environment;
plug-in modules wherein each plug-in module interfaces with a different one of the stack levels to resolve a reference to a storage object and to pass the resolved reference to a next stack level, unless the resolved reference is an absolute reference to the storage object housed on one or more of the storage devices, wherein each plug-in module resolves references to storage objects according to a different level of abstraction; and
a controller that selectively calls a number of the plug-in modules until the absolute reference is obtained.
9. The system of claim 8 , wherein one or more replica references are obtained by the controller with the obtained absolute reference, the replica references identifying replicas for the storage object within the first storage environment.
10. The system of claim 8 , wherein the controller is an application programming interface (API) library.
11. The system of claim 8 , wherein the controller executes in both the first storage environment and a second storage environment.
12. The system of claim 8 , wherein the controller is used by a client module in a second storage environment.
13. The system of claim 8 , wherein the storage management stack is a storage hierarchy representing a storage configuration for the storage object within the first storage environment.
14. The system of claim 8 , wherein the stack levels include an application level, a file system level, a volume manager level, and a device level.
15. The system of claim 14 , wherein the device driver level is the lowest level.