1. A process for producing an optical element, which comprises heating a precision press-molding preform and precision press-molding the preform with a mold, said precision press-molding preform being formed of an optical glass comprising, by mol %,
5 to 25.37% of B2O3,
3 to 50% of SiO2,
10 to 40% of TiO2,
10.45 to 40% of ZnO,
5 to 20% of La2O3
0 to 10% of Gd2O3,
0 to 15% of Nb2O5,
0 to 10% of ZrO2,
0 to 5% of Ta2O5,
0 to 10% of Bi2O3,
0 to 6% of MgO,
0 to 8% of CaO,
0 to 10% of SrO,
0 to 6% of BaO
provided that the total content of MgO, CaO, SrO and BaO is 15% or less,
0 to 20% of Li2O, and
0 to 5% of Na2O,
containing no PbO or As2O3, optionally containing not more than 1% by weight of Sb2O3 as a refining agent, having a refractive index (nd) of over 1.88 and an Abbe’s number (\u03bdd) of 35 or less and having a glass transition temperature of 620\xb0 C. or lower.
2. A process for producing an optical element, which comprises heating a precision press-molding preform and precision press-molding the preform with a mold, said precision press-molding preform being formed of an optical glass comprising, by mol %,
5 to 25.37% of B2O3,
3 to 50% of SiO2,
10 to 40% of TiO2,
10.45 to 40% of ZnO,
5 to 20% of La2O3,
0 to 10% of Gd2O3,
0 to 15% of Nb2O5,
0 to 10% of ZrO2,
0 to 5% of Ta2O5,
0 to 10% of Bi2O3,
0 to 6% of MgO,
0 to 8% of CaO,
0 to 10% of SrO,
0 to 6% of BaO,
0 to 20% of Li2O,
0 to 5% of Na2O,
provided that the content of Sb2O3 is 1% by weight or less, containing no PbO or As2O3, having a refractive index (nd) of over 1.88 and an Abbe’s number (\u03bdd) of 35 or less, and having a glass transition temperature of 620\xb0 C. or lower.
3. The process for producing an optical element as recited in claim 1 or 2, wherein the press mold and the preform are heated together to precision press-mold the preform with the press mold.
4. The process for producing an optical element as recited in claim 1 or 2, wherein the press mold is pre-heated, and the preform is pre-heated separately from the press mold and introduced into the pre-heated press mold to precision press-mold the preform with the press mold.
5. The process of claim 1 or 2, wherein the preform is formed of the optical glass containing 1 to 20 mol % of Li2O.
6. The process of claim 5, wherein the preform is formed of the optical glass containing 2 to 20 mol % of Li2O.
7. The process of claim 6, wherein the preform is formed of the optical glass containing 4 to 15 mol % of Li2O.
8. The process of claim 1 or 2, wherein the preform is formed of the optical glass having an Abbe’s number (\u03bdd) of 34 or less.
9. The process of claim 1 or 2, wherein the preform is formed of the optical glass having a sag temperature of 670\xb0 C. or lower.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A method for rewriting data in a deduplication storage environment by a processor device, comprising:
partitioning an original deduplication file system (DFS) file into a first set of sections being sections including data affected by rewrite operations and a second set of sections being sections including data unaffected by rewrite operations;
creating a new DFS file to be stored as part of a plurality of user files, the plurality of user files including the original DFS file and being accessible by a sequential deduplication file system and a dynamic non-deduplicated file system, the dynamic non-deduplicated file system including a plurality of dynamic metadata files having entries pointing to corresponding sections of the original DFS files;
directly writing the first set of sections of the original DFS file including data affected by rewrite operations into the new DFS file;
quoting the second set of sections from the original DFS file including data unaffected by rewrite operations into the new DFS file; and
deleting the original DFS file.
2. The method of claim 1, wherein quoting the second set of sections of the original DFS file including the data unaffected by rewrite operations is performed into an additional new DFS file.
3. The method of claim 1, wherein the deduplication file system is static.
4. The method of claim 1, wherein the entries of one of the dynamic metadata files are modified to reflect a new layout of one of the user files over the new DFS file.
5. The method of claim 1, further comprising replacing entries in a dynamic metadata file associated with the deleted original DFS file with a new entry pointing to the new DFS file.
6. The method of claim 1, further comprising using a dynamic file system layer to implement the sequential deduplication file system and the dynamic non-deduplicated file system to create and maintain the user files.
7. The method of claim 1, further comprises using a dynamic file system layer to sequentially compose the new DFS file.
8. A system for rewriting data in a deduplication storage environment, comprising:
a processing device, operable in the deduplication storage environment, wherein the processing device is adapted for:
partitioning an original deduplication file system (DFS) file into a first set of sections being sections including data affected by rewrite operations and a second set of sections being sections including data unaffected by rewrite operations;
creating a new DFS file to be stored as part of a plurality of user files, the plurality of user files including the original DFS file and being accessible by a sequential deduplication file system and a dynamic non-deduplicated file system, the dynamic non-deduplicated file system including a plurality of dynamic metadata files having entries pointing to corresponding sections of the original DFS files;
directly writing the first set of sections of the original DFS file including data affected by rewrite operations into the new DFS file;
quoting the second set of sections from the original DFS file including data unaffected by rewrite operations into the new DFS file; and
deleting the original DFS file.
9. The system of claim 8, wherein the processing device is further adapted for quoting the second set of sections of the original DFS file including the data unaffected by rewrite operations is performed into an additional new DFS file.
10. The system of claim 8, wherein the deduplication file system is static.
11. The system of claim 8, wherein the entries of one of the dynamic metadata files are modified to reflect a new layout of one of the user files over the new DFS file.
12. The system of claim 8, wherein the processing device is further adapted for replacing entries in a dynamic metadata file associated with the deleted original DFS file with a new entry pointing to the new DFS file.
13. The system of claim 8, wherein the processing device is further adapted for using a dynamic file system layer to implement the sequential deduplication file system and the dynamic non-deduplicated file system to create and maintain the user files.
14. The system of claim 8, wherein the processing device is further adapted for using a dynamic file system layer to sequentially compose the new DFS file.
15. A computer program product for rewriting data in a deduplication storage environment by a processor device, the computer program product comprising a non-transitory computer-readable storage medium having computer-readable program code portions stored therein comprising:
a first executable portion for partitioning an original deduplication file system (DFS) file into a first set of sections being sections including data affected by rewrite operations and a second set of sections being sections including data unaffected by rewrite operations;
a second executable portion for creating a new DFS file to be stored as part of a plurality of user files, the plurality of user files including the original DFS file and being accessible by a sequential deduplication file system and a dynamic non-deduplicated file system, the dynamic non-deduplicated file system including a plurality of dynamic metadata files having entries pointing to corresponding sections of the original DFS files;
a third executable portion for directly writing the first set of sections of the original DFS file including data affected by rewrite operations into the new DFS file;
a fourth executable portion for quoting the second set of sections from the original DFS file including data unaffected by rewrite operations into the new DFS file; and
a fifth executable portion for deleting the original DFS file.
16. The computer program product of claim 15, wherein quoting the second set of sections of the original DFS file including the data unaffected by rewrite operations is performed into an additional new DFS file.
17. The computer program product of claim 15, wherein the entries of one of the dynamic metadata files are modified to reflect a new layout of one of the user files over the new DFS file.
18. The computer program product of claim 15, further comprising a sixth executable portion for replacing entries in a dynamic metadata file associated with the deleted original DFS file with a new entry pointing to the new DFS file.
19. The computer program product of claim 15, further comprising a sixth executable portion using a dynamic file system layer to implement the sequential deduplication file system and the dynamic non-deduplicated file system to create and maintain the user files.
20. The computer program product of claim 15, further comprising a sixth executable portion using a dynamic file system layer to sequentially compose the new DFS file.