摘要:
In a redundant array of disks comprising a plurality of rotating disks and at least one solid-state disk data are stored on said rotating disks and check informations of said data are stored on said solid-state disk.
摘要:
A method of storing new data in a redundant group of disks is proposed which comprises the steps of receiving said new data from a host computer; writing said new data on at least one disk in said group; notifying said host computer that the storing of said new data is completed as soon as the foregoing step of writing the new data ends; and reading data from disks in said group at periodic intervals, computing check information from the data thus read, and writing said check information on at least one disk in said group.
摘要:
An array of disk drives stores information which is accessed through multiple channels by a host computer. Different channels are coupled to different sequences of disk drives. Different disk drives can be accessed simultaneously through different channels, enabling high data transfer rates. The same disk drive can be accessed through two different channels, enabling access even if one of the channels is busy or malfunctioning. According to one aspect of the invention the channels are divided into at least two mutually exclusive sets of channels, each set providing access to all the disk drives.
摘要:
A method of storing data in a redundant group of disks and a redundant array of disks are disclosed. A plurality of disks is partitioned into areas certain areas being designated as data areas for storing data. Certain other areas are designated as check areas for storing check information of corresponding data areas disposed on different disks in said group. In a semiconductor memory a usage status table is maintained indicating which areas are in use and which are not is use. From a host computer new data to be stored in said group of disks are received and a microprocessor chooses selected data areas in which to store said new data, which are written in said selected data areas. Further said microprocessor writes, in corresponding check areas, new check information pertaining to the new data written in said selected areas and to data in any corresponding areas indicated by said usage status table to be in use, but not pertaining to data areas not indicated to be in use.
摘要:
In a redundant array of disks, the disks are divided into areas of different sizes, so that small amounts of data can be stored in an area of an appropriate size on a single disk, instead of being spread over multiple disks. A usage status table indicates which areas are in use. Check information is generated and stored only for areas indicated to be in use. When new check information is generated, it is therefore possible to omit the reading of unnecessary old data and old check information. When a disk fails and is replaced with a standby disk, only the data in areas indicated to be in use are reconstructed. Check information can be stored on a solid-state disk.
摘要:
In a redundant array of disks, the disks are divided into areas of different sizes, so that small amounts of data can be stored in an area of an appropriate size on a single disk, instead of being spread over multiple disks. A usage status table indicates which areas are in use. Check information is generated and stored only for areas indicated to be in use. When new check information is generated, it is therefore possible to omit the reading of unnecessary old data and old check information. When a disk fails and is replaced with a standby disk, only the data in areas indicated to be in use are reconstructed. Check information can be stored on a solid-state disk.
摘要:
An array of disk drives stores information which is accessed through multiple channels by a host computer. Different channels are coupled to different sequences of disk drives. Different disk drives can be accessed simultaneously through different channels, enabling high data transfer rates. The same disk drive can be accessed through two different channels, enabling access even if one of the channels is busy or malfunctioning. According to one aspect of the invention the channels are divided into at least two mutually exclusive sets of channels, each set providing access to all the disk drives.
摘要:
An array of disk drives stores information which is accessed through multiple channels by a host computer. Different channels are coupled to different sequences of disk drives. Different disk drives can be accessed simultaneously through different channels, enabling high data transfer rates. The same disk drive can be accessed through two different channels, enabling access even if one of the channels is busy or malfunctioning. According to one aspect of the invention the channels are divided into at least two mutually exclusive sets of channels, each set providing access to all the disk drives.
摘要:
A recording device which improves a response time to write data by reporting to a host computer (1) the completion of writing operation prior to the completion of writing redundancy data. Data writing command imformation from the host computer is stored in a command/status memory (14) backed up by a power source (16) in an array controller (13), and the completion of writing operation is reported to the host computer at the time of the completion of writing updated data prior to the completion of writing redundancy data. Redundancy data is written as a background process. If redundancy data could not be written due to any abnormality of the power source or the like, such redundancy data may be generated from the data in other disk units of the same redundancy group in accordance with writing command information stored in the command/status memory, thereby completing the writing of redundancy data.
摘要:
In a redundant array of disks, the disks are divided into areas of different sizes, so that small amounts of data can be stored in an area of an appropriate size on a single disk, instead of being spread over multiple disks. A usage status table indicates which areas are in use. Check information is generated and stored only for areas indicated to be in use. When new check information is generated, it is therefore possible to omit the reading of unnecessary old data and old check information. When a disk fails and is replaced with a standby disk, only the data in areas indicated to be in use are reconstructed. Check information can be stored on a solid-state disk.