NETWORK STORAGE DEVICE AND DATA READ-WRITE CONTROL METHOD
An embodiment of the present invention discloses a network storage device including a physical storage medium. The network storage device further includes: a storage controller, configured to map the physical storage medium to sub-logical units and map the sub-logical units to logical units, so as to implement data storing, reading, and writing, wherein the sub-logical units are identified by sub-logical unit numbers and the logical units are identified by logical unit numbers. In addition, an embodiment of the present invention further discloses a data read-write control method. The present invention can enlarge valid storage capacity of the logical units, and is compatible with existing logical unit data read-write manners.
1 . A network storage device comprising a physical storage medium, further comprising:
a storage controller, configured to map the physical storage medium to sub-logical units and map the sub-logical units to logical units, so as to implement data storing, reading, and writing, wherein the sub-logical units are identified by sub-logical unit numbers and the logical units are identified by logical unit numbers.
2 . The network storage device according to claim 1 , wherein the storage controller comprises:
a storage unit, configured to store a mapping relationship between the sub-logical units and the physical storage medium and a mapping relationship between the sub-logical units and the logical units; and
a read-write control unit, configured to control data storing, reading, and writing, according to the mapping relationship between the sub-logical units and the physical storage medium, and the mapping relationship between the sub-logical units and the logical units.
3 . The network storage device according to claim 2 , wherein the read-write control unit implements data storing, reading, and writing in a reliable read-write manner.
4 . The network storage device according to claim 2 , wherein the read-write control unit controls data reading and writing in the logical units, according to a preset order.
5 . The network storage device according to claim 2 , wherein the read-write control unit implements data reading and writing, according to the start position identification of data blocks stored in each of the sub-logical units.
6 . The network storage device according to claim 2 , wherein a linked list is employed for the mapping relationship between the sub-logical units and the physical storage medium, and a one-to-one mapping relationship is employed for the mapping relationship between the sub-logical units and the logical units.
7 . A data read-write control method, comprising:
acquiring a mapping relationship between a physical storage medium and sub-logical units, and a mapping relationship between the sub-logical units and logical units; and
controlling data reading and writing, according to the mapping relationship between the physical storage medium and the sub-logical units, and the mapping relationship between the sub-logical units and the logical units.
8 . The data read-write control method according to claim 7 , wherein data reading and writing is implemented in a reliable read-write manner.
9 . The data read-write control method according to claim 7 , wherein data reading and writing in the sub-logical units is implemented, according to a preset order.
10 . The data read-write control method according to claim 7 , wherein data reading and writing is implemented, according to the start position identification of data blocks stored in each of the sub-logical units.
11 . The data read-write control method according to claim 7 , wherein a linked list is employed for the mapping relationship between the sub-logical units and the physical storage medium, and a one-to-one mapping relationship is employed for the mapping relationship between the sub-logical units and the logical units.
12 . A computer readable medium including code for acquiring a mapping relationship between a physical storage medium and sub-logical units and a mapping relationship between the sub-logical units and logical units; and
controlling data reading and writing, according to the mapping relationship between the physical storage medium and the sub-logical units, and the mapping relationship between the sub-logical units and the logical units.