System and method for data protection on a storage medium
First Claim
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1. A method for data protection comprising:
- (a) mounting a virtual storage that combines a full access temporary storage and a READ-only portion of a volume of a main storage, wherein the READ-only portion represents a protected area of the volume with useful data and the temporary storage represents a free space of the volume;
(b) generating a bitmap for blocks of the virtual storage with all blocks initially unmarked;
(c) redirecting virtual storage write requests to the temporary storage, wherein(1) if a data block must be written to initially occupied space of the volume of the main storage, then this data block is written to free space of the temporary storage;
(2) if a data block must be written to an initially free space of the volume of the main storage, which is allocated to the temporary storage, and the initially free space is not occupied by the another data block of the temporary storage, then this data block is written to the free space, but this data block still belongs to the temporary storage;
(3) if a data block must be written to the initially free space of the volume of the main storage, which is allocated to the temporary storage, and the initially free space is occupied by the another data block, which was written to the temporary storage, then this data block is written to other free space of the temporary storage;
(d) marking, in the bitmap, blocks of the virtual storage corresponding to blocks of the temporary storage that are being written to;
(e) redirecting, to the READ-only portion, read requests for unmarked blocks;
(f) redirecting, to the temporary storage, read requests for marked blocks;
(g) upon an acceptance, by a user, of a state of the virtual storage, merging the temporary storage with unmarked blocks of the READ-only portion to form an integral storage that contains all the useful data, wherein(1) for the data blocks of (c)(1), moving the data blocks to the READ-only portion, to replace unmarked corresponding blocks in the READ-only portion;
(2) for the data blocks of (c)(2), leaving the data blocks in place;
(3) for the data blocks of (c)(3), first moving the data blocks that prevented writing the original block to the intended located in the temporary storage, and then moving the data blocks of (c)(3) to the location that was originally intended for these blocks;
and(h) upon a rejection, by the user, of a state of the virtual storage, terminating the redirecting.
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Abstract
A method of and system for protecting a disk drive or other data storage includes mounting a virtual storage that combines a READ-only portion of a volume of the main storage and a full access temporary storage located on the same data storage, wherein the READ-only portion represents a protected area of the volume of the main storage; generating a bitmap for blocks of the virtual storage; redirecting virtual storage write requests to the temporary storage; marking, in the bitmap, blocks of the virtual storage corresponding to blocks of the temporary storage that are being written to; redirecting, to the READ-only portion, read requests for unmarked blocks; redirecting, to the temporary storage, read requests for marked blocks; upon an acceptance of a state of the virtual storage, merging the temporary storage with unmarked blocks of the READ-only portion of the volume of the main storage, to form an integral storage; and upon a rejection of a state of the virtual storage, terminating the redirecting. Optionally, data in the temporary storage can be archived.
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Citations
10 Claims
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1. A method for data protection comprising:
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(a) mounting a virtual storage that combines a full access temporary storage and a READ-only portion of a volume of a main storage, wherein the READ-only portion represents a protected area of the volume with useful data and the temporary storage represents a free space of the volume; (b) generating a bitmap for blocks of the virtual storage with all blocks initially unmarked; (c) redirecting virtual storage write requests to the temporary storage, wherein (1) if a data block must be written to initially occupied space of the volume of the main storage, then this data block is written to free space of the temporary storage; (2) if a data block must be written to an initially free space of the volume of the main storage, which is allocated to the temporary storage, and the initially free space is not occupied by the another data block of the temporary storage, then this data block is written to the free space, but this data block still belongs to the temporary storage; (3) if a data block must be written to the initially free space of the volume of the main storage, which is allocated to the temporary storage, and the initially free space is occupied by the another data block, which was written to the temporary storage, then this data block is written to other free space of the temporary storage; (d) marking, in the bitmap, blocks of the virtual storage corresponding to blocks of the temporary storage that are being written to; (e) redirecting, to the READ-only portion, read requests for unmarked blocks; (f) redirecting, to the temporary storage, read requests for marked blocks; (g) upon an acceptance, by a user, of a state of the virtual storage, merging the temporary storage with unmarked blocks of the READ-only portion to form an integral storage that contains all the useful data, wherein (1) for the data blocks of (c)(1), moving the data blocks to the READ-only portion, to replace unmarked corresponding blocks in the READ-only portion; (2) for the data blocks of (c)(2), leaving the data blocks in place; (3) for the data blocks of (c)(3), first moving the data blocks that prevented writing the original block to the intended located in the temporary storage, and then moving the data blocks of (c)(3) to the location that was originally intended for these blocks; and (h) upon a rejection, by the user, of a state of the virtual storage, terminating the redirecting. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system for data protection, the system comprising:
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(a) a virtual storage that combines a full access temporary storage and a READ-only portion of a volume of a main storage, wherein the READ-only portion represents a protected area of the volume with useful data and the temporary storage represents a free space of the volume; (b) a bitmap for blocks of the virtual storage with all blocks initially unmarked; (c) virtual storage write requests that are redirected to the temporary storage, wherein (1) if a data block must be written to initially occupied space of the volume of the main storage, then this data block is written to free space of the temporary storage; (2) if a data block must be written to an initially free space of the volume of the main storage, which is allocated to the temporary storage, and the initially free space is not occupied by the another data block of the temporary storage, then this data block is written to the free space, but this data block still belongs to the temporary storage; (3) if a data block must be written to the initially free space of the volume of the main storage, which is allocated to the temporary storage, and the initially free space is occupied by the another data block, which was written to the temporary storage, then this data block is written to other free space of the temporary storage; (d) wherein the system marks in the bitmap blocks of the virtual storage corresponding to blocks of the temporary storage that are being written to; (e) read requests for unmarked blocks that are redirected by the system to the READ-only portion; (f) read requests for marked blocks that are redirected by the system to the to the temporary storage; (g) upon an acceptance, by a user, of a state of the virtual storage, the system merges the temporary storage with unmarked blocks of the READ-only portion to form an integral storage that contains all the useful data, wherein (1) for the data blocks of (c)(1), the system moves the data blocks to the READ-only portion, to replace unmarked corresponding blocks in the READ-only portion; (2) for the data blocks of (c)(2), the system leaves the data blocks in place; (3) for the data blocks of (c)(3), the system first moves the data blocks that prevented writing the original block to the intended located in the temporary storage, and then moves the data blocks of (c)(3) to the location that was originally intended for these blocks; and (h) upon a rejection, by the user, of a state of the virtual storage, the system terminates the redirecting.
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Specification
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Current AssigneeMidCap Financial Trust
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Original AssigneeAcronis, Inc. (Acronis AG)
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InventorsDyatlov, Dennis S., Tsybrovskyy, Yuriy V., Beloussov, Serguei M., Lyadvinsky, Maxim V.
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Primary Examiner(s)Rojas; Midys
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Application NumberUS12/126,332Time in Patent Office1,103 DaysField of Search709/217, 709/219, 709/225, 709/229, 711/114, 711/118, 711/151, 711/158, 711/161, 711/162, 711/163, 711/167, 711/203US Class Current711/163CPC Class CodesG06F 11/1435 using file system or storag...G06F 21/78 to assure secure storage of...G06F 2201/815 VirtualG06F 2201/84 Using snapshots, i.e. a log...
