Method and system for writing to and reading from computer readable media
View Patent ↗According to one embodiment, a method includes receiving a write request and determining a first portion of information associated with the write request. The method additionally includes determining a first location on a first disk to write the first portion of information and, based on the determined first location on the first disk, determining a second location on a second disk to write the first portion of information. The method further includes writing the first portion of the information to the first location on the first disk. The first location comprises an outer track of the first disk. The method further includes writing the first portion of the information to the second location on the second disk, the second location comprising an inner track of the second disk.
1. A method, comprising:
receiving a write request;
determining a first portion of information associated with the write request;
determining a first location on a first disk to write the first portion of information, wherein determining the first location on the first disk comprises determining a first sector corresponding to the first location;
writing the first portion of the information to the first location on the first disk, the first location comprising an outer track of the first disk, wherein writing the first portion of the information to the first location on the first disk comprises writing the first portion of the information to the first sector;
calculating a total number of sectors on the first disk;
calculating a total number of sectors on the second disk;
determining that the total number of sectors on the first disk is different than the total number of sectors on the second disk;
in response to determining that the total number of sectors of the first disk is different than the total number of sectors on the second disk, determining a subset of sectors on the second disk;
based on the determined first location on the first disk, determining a second location on a second disk to write the first portion of information, wherein determining the second location on the second disk comprises determining a second sector from the subset of sectors on the second disk; and
writing the first portion of the information to the second location on the second disk, the second location comprising an inner track of the second disk, wherein writing the first portion of the information to the second location on the second disk comprises writing the first portion of the information to the second sector.
2. The method of claim 1 , wherein the first disk and the second disk are in a redundant array of independent disks (RAID) configuration.
3. A method, comprising:
receiving a write request;
determining a first portion of information associated with the write request;
determining a first location on a first disk to write the first portion of information;
based on the determined first location on the first disk, determining a second location on a second disk to write the first portion of information;
determining a first sector corresponding to the first location;
writing the first portion of the information to the first location on the first disk, the first location comprising an outer track of the first disk, wherein writing the first portion of the information to the first location on the first disk comprises writing the first portion of the information to the first sector;
determining a first sector number corresponding to the first sector;
determining a second sector number by analyzing the first sector number with respect to the other sector numbers of the first disk; and
writing the first portion of the information to the second location on the second disk, the second location comprising an inner track of the second disk, wherein writing the first portion of the information to the second location on the second disk comprises writing the first portion of the information to a second sector corresponding to the second sector number.
4. A method, comprising:
receiving a read request for a first information, the first information stored on an outer track of a first disk, the first information also stored on an inner track of a second disk;
determining a first location on the first disk corresponding to the read request;
determining whether the first location is an outer track of the first disk;
in response to determining that the first location is an outer track of the first disk, directing the read request to the first disk rather than the second disk.
5. The method of claim 4 , wherein the first disk and the second disk are in a redundant array of independent disks (RAID) configuration.
6. The method of claim 4 , wherein:
determining the first location comprises determining a first sector; and
determining whether the first location is an outer track of the first disk comprises:
determining a first sector number corresponding to the first sector;
analyzing the first sector number with respect to other sector numbers of the first disk; and
in response to analyzing the first sector number, determining the first sector number corresponds to the outer track of the first disk.
7. The method of claim 4 , wherein:
determining the first location comprises determining a first sector; and
determining whether the first location is an outer track of the first disk comprises:
calculating a total number of sectors on the first disk;
determining a first sector number corresponding to the first sector;
calculating the difference between the total number of sectors and the first sector number;
determining whether the first sector number is less than or equal to the difference between the total number of sectors and the first sector number; and
in response to determining whether the first sector number is less than or equal to the difference between the total number of sectors and the first sector number, determining the first sector number corresponds to the outer track of the first disk.
8. The method of claim 4 , wherein:
determining a first location comprises determining a first sector; and
determining whether the first location is an outer track of the first disk comprises:
determining a first sector number corresponding to the first sector;
comparing the first sector number to a threshold; and
in response to comparing the first sector number to a threshold, determining the first sector number corresponds to the outer track of the first disk.
9. An information-handling system, comprising:
a processor;
a memory communicatively coupled to the processor;
a controller communicatively coupled to the processor and the memory, the controller configured to:
receive a write request;
determine a first portion of information associated with the write request;
determine a first location on a first disk to write the first portion of information, wherein determining the first location on the first disk comprises determining a first sector corresponding to the first location;
write the first portion of the information to the first location on the first disk, the first location comprising an outer track of the first disk, wherein writing the first portion of the information to the first location on the first disk comprises writing the first portion of the information to the first sector;
calculate a total number of sectors on the first disk;
calculate a total number of sectors on the second disk;
determine that the total number of sectors on the first disk is different than the total number of sectors on the second disk;
in response to determining that the total number of sectors of the first disk is different than the total number of sectors on the second disk, determine a subset of sectors on the second disk;
based on the determined first location on the first disk, determine a second location on a second disk to write the first portion of information, wherein determining the second location on the second disk comprises determining a second sector from the subset of sectors on the second disk; and
write the first portion of the information to the second location on the second disk, the second location comprising an inner track of the second disk, wherein writing the first portion of the information to the second location on the second disk comprises writing the first portion of the information to the second sector.
10. The system of claim 9 , wherein the first disk and the second disk are in a redundant array of independent disks (RAID) configuration.
11. An information handling system, comprising:
a processor;
a memory communicatively coupled to the processor;
a controller communicatively coupled to the processor and the memory, the controller configured to:
receive a write request;
determine a first portion of information associated with the write request;
determine a first location on a first disk to write the first portion of information;
based on the determined first location on the first disk, determine a second location on a second disk to write the first portion of information;
determine a first sector corresponding to the first location;
write the first portion of the information to the first location on the first disk, the first location comprising an outer track of the first disk, wherein writing the first portion of the information to the first location on the first disk comprises writing the first portion of the information to the first sector;
determine a first sector number corresponding to the first sector;
determine a second sector number by analyzing the first sector number with respect to the other sector numbers of the first disk; and
write the first portion of the information to the second location on the second disk, the second location comprising an inner track of the second disk, wherein writing the first portion of the information to the second location on the second disk comprises writing the first portion of the information to a second sector corresponding to the second sector number.
12. An information-handling system, comprising:
a processor;
a memory communicatively coupled to the processor;
a controller communicatively coupled to the processor and the memory, the controller configured to:
receive a read request for a first information, the first information stored on an outer track of a first disk, the first information also stored on an inner track of a second disk;
determine a first location on the first disk corresponding to the read request;
determine whether the first location is an outer track of the first disk;
in response to determining that the first location is an outer track of the first disk, direct the read request to the first disk rather than the second disk.
13. The system of claim 12 , wherein the first disk and the second disk are in a redundant array of independent disks (RAID) configuration.
14. The system of claim 12 , wherein:
determining the first location comprises determining a first sector; and
determining whether the first location is an outer track of the first disk comprises:
determining a first sector number corresponding to the first sector;
analyzing the first sector number with respect to other sector numbers of the first disk; and
in response to analyzing the first sector number, determining the first sector number corresponds to the outer track of the first disk.
15. The system of claim 12 , wherein:
determining the first location comprises determining a first sector; and
determining whether the first location is an outer track of the first disk comprises:
calculating a total number of sectors on the first disk;
determining a first sector number corresponding to the first sector;
calculating the difference between the total number of sectors and the first sector number;
determining whether the first sector number is less than or equal to the difference between the total number of sectors and the first sector number; and
in response to determining whether the first sector number is less than or equal to the difference between the total number of sectors and the first sector number, determining the first sector number corresponds to the outer track of the first disk.
16. The system of claim 12 , wherein:
determining a first location comprises determining a first sector; and
determining whether the first location is an outer track of the first disk comprises:
determining a first sector number corresponding to the first sector;
comparing the first sector number to a threshold; and
in response to comparing the first sector number to a threshold, determining the first sector number corresponds to the outer track of the first disk.