Method for controlling disk drive using an address...

Details Method for controlling disk drive using an address... Method for controlling disk drive using an address...

2005-03-31

2008-08-12

Sparks, Donald (Department: 2187)

Electrical computers and digital processing systems: memory

Address formation

Address mapping

C711S001000, C711S002000, C711S004000, C711S006000, C711S100000, C711S111000, C711S112000, C711S113000, C711S118000, C711S202000, C711S205000, C710S009000

Reexamination Certificate

active

07412585

ABSTRACT:
Embodiments of the invention achieve data write in an appending manner by conversion from a logical block address to a physical block address in a HDD that has only one storage device and does not have a large-scale cache memory. In one embodiment, a check is made as to whether or not the size of an address translation table in a cache memory exceeds a threshold value. If the size exceeds the threshold value, entries whose number is specified are selected by the LRU method. The selected entries are added to a WRITE buffer, and the address translation table is saved on the HDD by executing WRITE. Seek time of a head at the time of WRITE is reduced, thereby improving WRITE performance. There is produced an effect of building such a snapshot that while a usual access to a HDD volume is allowed, it is possible to make an access to a volume of the snapshot which is a past state of the HDD. Disabling write after writing to the HDD is disabled. Thus, it possible to roll back to a HDD state at an arbitrary point of time.

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Patterson et al., “A Case for Redundant Arrays of Inexpensive Disks (Raid),”Proceedings of International Conference on Management of Data(SIGMOND), Jun. 1988, pp. 109-116.
Rosenblum et al., “The Design and Implementation of a Log-Structured File System,”ACM Transactions on Computer Systems, vol. 10, No. 1, Feb. 1992, pp. 3-25.

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