System for automated boot from disk image
First Claim
Patent Images
1. A method comprisingcopying information stored in a physical medium of a computer system to an electronic file;
- storing the electronic file in random access memory of the computer system;
changing one or more characteristics in the computer system so that a process executing in the computer system is provided with data from the stored electronic file when an access to a physical device is attempted;
using the computer system for executing at least a portion of the information in the random access memory;
modifying a vector in the computer system so that an access to a disk drive results in an access to at least a portion of the information in the random access memory; and
modifying the contents of a vector location to point to at least a portion of the information in the random access memory.
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Abstract
A system allowing a target machine to be booted up from a disk image stored in memory. Instead of reading the boot-up information from a disk drive or other physical device the data is read from memory. No modification is necessary to native operating system, input/output subsystem, bootstrap code, etc., since the invention modifies characteristics, such as vectors used by the operating system, to make the disk image in memory appear to be the same as a standard external device.
118 Citations
16 Claims
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1. A method comprising
copying information stored in a physical medium of a computer system to an electronic file; -
storing the electronic file in random access memory of the computer system; changing one or more characteristics in the computer system so that a process executing in the computer system is provided with data from the stored electronic file when an access to a physical device is attempted; using the computer system for executing at least a portion of the information in the random access memory; modifying a vector in the computer system so that an access to a disk drive results in an access to at least a portion of the information in the random access memory; and modifying the contents of a vector location to point to at least a portion of the information in the random access memory. - View Dependent Claims (2, 3, 4, 5)
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6. An apparatus comprising:
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a physical medium; a random access memory; a computer system, comprising the physical medium and the random access memory; and instructions stored within the computer system, the instructions configured to cause said computer to copy information stored in the physical medium to an electronic file, store the electronic file in the random access memory, change one or more characteristics in the computer system so that a process executing in the computer system is provided with data from the stored electronic file when an access to a physical device is attempted, use the computer system for executing at least a portion of the information in the random access memory, modify a vector in the computer system so that an access to a disk drive results in an access to at least a portion of the information in the random access memory, and modify the contents of a vector location to point to at least a portion of the information in the random access memory. - View Dependent Claims (7, 8, 9, 10)
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11. A computer program product comprising:
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a first set of instructions, executable on a computer system, configured to copy information stored in a physical medium of a computer system to an electronic file; a second set of instructions, executable on a computer system, configured to store the electronic file in random access memory of the computer system; a third set of instructions, executable on a computer system, configured to change one or more characteristics in the computer system so that a process executing in the computer system is provided with data from the stored electronic file when an access to a physical device is attempted; a fourth set of instructions, executable on a computer system, configured to use the computer system for executing at least a portion of the information in the random access memory; a fifth set of instructions, executable on a computer system, configured to modify a vector in the computer system so that an access to a disk drive results in an access to at least a portion of the information in the random access memory; a sixth set of instructions, executable on a computer system, configured to modify the contents of a vector location to point to at least a portion of the information in the random access memory; and computer readable media, wherein said computer program product is encoded in said computer readable media. - View Dependent Claims (12, 13, 14, 15)
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16. An apparatus comprising:
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means for copying information stored in a physical medium of a computer system to an electronic file; means for storing the electronic file in random access memory of the computer system; means for changing one or more characteristics in the computer system so that a process executing in the computer system is provided with data from the stored electronic file when an access to a physical device is attempted; means for using the computer system for executing at least a portion of the information in the random access memory; means for modifying a vector in the computer system so that an access to a disk drive results in an access to at least a portion of the information in the random access memory; and means for modifying the contents of a vector location to point to at least a portion of the information in the random access memory.
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Specification