Browse Prior Art Database

Method For Implementing a RAID Drive Array Using a Single Physical Drive

IP.com Disclosure Number: IPCOM000035512D
Original Publication Date: 2005-Jan-21
Included in the Prior Art Database: 2005-Jan-21
Document File: 2 page(s) / 99K

Publishing Venue

IBM

Abstract

Currently hard drives can be arranged in a RAID 0 drive array using two or more drives. This is done to increase the speed at which data is read from the drive through data striping. All current RAID systems require two or more complete physical drives to function. This increases costs as the drive platters, motors, control logic boards, power supplies, and cases are all duplicated across multiple drives. This also increases the possibility that any individual drive will fail, as the number of failure-prone components is increased. This invention describes a method to construct a drive such that a RAID 0 array can be implemented using a single drive. The two key aspects to the invention are: - Add a secondary drive read/write arm to the opposing side of the drive - Partition the data on the drive into two halves, an inner ring and an outer ring. Conventional drives have a single arm that swings across all the platters of the drive to position the drive read/write heads over the data tracks. By adding a second, independent drive arm, two tracks can be read or written at the same time, just as in a multiple drive RAID installation.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 66% of the total text.

Page 1 of 2

Method For Implementing a RAID Drive Array Using a Single Physical Drive

This invention describes a way to construct a drive such that a RAID 0 array can be implemented without using multiple drives. This has the following advantages:

- The construction method is slightly more expensive than a standard drive, but much less expensive than duplicating the drive as is currently required with a standard RAID configuration. So, the resulting RAID array is less expensive than the existing solution.

- The reliability of each individual drive constructed in this manner is greater than multiple conventional drives due to fewer components used and therefore fewer possible failure points. The overall system is therefore more reliable than the existing solution.

- The form factor of a drive constructed in this manner is slightly larger than a standard drive, but much smaller than two complete physical drives. This system is therefore smaller than the existing solution.

- The energy used and heat produced from single RAID drive is lower than the multiple drives used in the existing solution.

The two key aspects to the invention are:

- Add a secondary drive read/write arm to the opposing side of the drive.

- Partition the data on the drive into two halves, an inner ring and an outer ring. Conventional drives have a single arm that swings across all the platters of the drive to position the drive read/write heads over the data tracks. By adding a second, independent drive arm,...