Reduced size extent identification
An approach for reduced size extent identifiers for a file system may be implemented by generating a full-size extent or file identifier and generating a smaller identifier from a portion of the full-size identifier. A check may be performed as to whether the smaller identifier is unique within a file system and if it is unique, the smaller identifier may be used in place of the full-size identifier. If not unique, the size of the smaller identifier may be increased. In some embodiments, the size of the smaller identifier is increased until a unique identifier if found.
1. A computer-implemented method comprising:
identifying a full-size identifier for an extent, the extent being stored in a file system;
generating a sub-size identifier from a sequential portion of the full-size identifier, the sub-size identifier being smaller than the full-size identifier, both the full-size identifier and the sub-size identifier uniquely identifying the extent within the file system, wherein the sub-size identifier has an initial size and a size of the sub-size identifier is increased from the initial size until the sub-size identifier is unique within the file system; and
storing the sub-size identifier to reference the extent in place of the full-size identifier.
2. The computer-implemented method of claim 1 , further comprising:
determining whether the sub-size identifier is unique in the file system and increasing the size if the sub-size identifier is not unique in the file system.
3. The computer-implemented method of claim 1 , wherein the full-size identifier is unique within the file system.
4. The computer-implemented method of claim 1 , wherein the sub-size identifier is generated from a leading sequential portion of the full-size identifier.
5. The computer-implemented method of claim 1 , wherein the sub-size identifier is stored as a primary identifier for the extent within the file system.
6. The computer-implemented method of claim 1 , further comprising receiving a write request for the extent and deduplicating the extent in the file system using the sub-size identifier.
7. The computer-implemented method of claim 1 , wherein the extent is deduplicated in a process comprising comparing the full-size identifier to other full-size identifiers in the file system.
8. The computer-implemented method of claim 1 , wherein the size of the sub-size identifier is repeatedly increased.
9. A system comprising:
a file system;
a computer processor to execute a set of instructions;
a memory to hold the set of instructions, in which the set of instructions, when executed by the computer processor cause a set of acts comprising:
identifying a full-size identifier for an extent, the extent being stored in a file system;
generating a sub-size identifier from a sequential portion of the full-size identifier, the sub-size identifier being smaller than the full-size identifier, both the full-size identifier and the sub-size identifier uniquely identifying the extent within the file system, wherein the sub-size identifier has an initial size and a size of the sub-size identifier is increased from the initial size until the sub-size identifier is unique within the file system; and
storing the sub-size identifier to reference the extent in place of the full-size identifier.
10. The system of claim 9 , wherein the set of acts further comprise determining whether the sub-size identifier is unique in the file system and increasing the size if the sub-size identifier is not unique in the file system.
11. The system of claim 9 , wherein the full-size identifier is unique within the file system.
12. The system of claim 9 , wherein the sub-size identifier is generated from a leading sequential portion of the full-size identifier.
13. The system of claim 9 , wherein the set of acts further comprise storing the sub-size identifier as a primary identifier for the extent within the file system.
14. The system of claim 9 , wherein the set of acts further processing a write request for the extent and deduplicating the extent in the file system.
15. The system of claim 9 , wherein the set of acts further comprise deduplicating the extent in a process comprising comparing the full-size identifier to other full-size identifiers in the file system.
16. The system of claim 9 , wherein the size of the sub-size identifier is repeatedly increased.
17. A non-transitory computer readable medium having stored thereon a sequence of instructions which, when executed by a processor causes a set of acts comprising:
identifying a full-size identifier for an extent, the extent being stored in a file system;
generating a sub-size identifier from a sequential portion of the full-size identifier, the sub-size identifier being smaller than the full-size identifier, both the full-size identifier and the sub-size identifier uniquely identifying the extent within the file system, wherein the sub-size identifier has an initial size and a size of the sub-size identifier is increased from the initial size until the sub-size identifier is unique within the file system; and
storing the sub-size identifier to reference the extent in place of the full-size identifier.
18. The non-transitory computer readable medium of claim 17 , wherein the set of acts further comprise determining whether the sub-size identifier is unique in the file system and increasing the size if the sub-size identifier is not unique in the file system.
19. The non-transitory computer readable medium of claim 17 , wherein the full-size identifier is unique within the file system.
20. The non-transitory computer readable medium of claim 17 , wherein the sub-size identifier is generated from a leading sequential portion of the full-size identifier.
21. The non-transitory computer readable medium of claim 17 , wherein the set of acts further comprise storing the sub-size identifier as a primary identifier for the extent within the file system.
22. The non-transitory computer readable medium of claim 17 , wherein the set of acts further comprise processing a write request for the extent and deduplicating the extent in the file system.
23. The non-transitory computer readable medium of claim 17 , wherein the set of acts further comprise deduplicating the extent in a process comprising comparing the full-size identifier to other full-size identifiers in the file system.
24. The non-transitory computer readable medium of claim 22 , wherein the size of the sub-size identifier is repeatedly increased.