Semiconductor memory disk apparatus with backup device capable o

Details Semiconductor memory disk apparatus with backup device capable o Semiconductor memory disk apparatus with backup device capable o

1989-09-28

1992-04-28

Beausoliel, Robert W.

Boots, shoes, and leggings

3642734, 3642685, 364DIG1, 36494391, 3649485, 364DIG2, 365228, 365229, 371 101, 371 66, G06F 1120

Patent

active

051095050

ABSTRACT:
In a semiconductor memory disk apparatus, when a read command is input as an input/output request during a restore operation, if a flag in a directory memory corresponding to the requested block is not set, data in a requested block is read out from a backup unit, and is written in the corresponding block of a semiconductor memory. At the same time, the readout data is transferred to a designated destination. Thereafter, the flag in the directory memory corresponding to the requested block is set. However, if the flag in the directory memory corresponding to the requested block is set, the requested data is read out from the semiconductor memory, and is transferred. When a write command is input as the input/output request during a restore operation, the data is written in a designated block of the semiconductor memory and the same data is also written in the corresponding block of the backup unit. In this case, the flag in the directory memory corresponding to the requested block is set.

REFERENCES:
patent: 3544777 (1970-12-01), Winkler
patent: 4327410 (1982-04-01), Patel
patent: 4348729 (1982-09-01), Sasayama
patent: 4393500 (1983-07-01), Imazeki
patent: 4584663 (1986-04-01), Tanikawa
"Fault-Tolerant Battery Back-Up Power System for Controlling I/O Devices for Continuous On-Line Transactions", IBMTDB, vol. 32, No. 5B, Oct. 1989, pp. 15-18.
Nikkei Electronics, Mar. 11, 1985, pp. 159-187.
Hitachi Hyoron, Takashi Oka et al., UDC 681.327.2.021.025, pp. 67-70.

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