| 摘要 |
PURPOSE:To attain loading/unloading of a memory board in holding the function by constituting a memory interface of a disc cache device like a structure enabled to load/unload an active line and informing the memory board to be loaded/unloaded to a control device. CONSTITUTION:In normal operating status, cache memories 500-800 are filled with data. When a maintenance command is executed from a console 400 to unload a memory board, a microprocessor in a control device 300 sets up flags for access inhibition and data invalidation to two corresponding directories. Conseqently, the block is made unrelated to caching operation and the memory board including the block can be unloaded. If a memory board is to be loaded, the access inhibition flag is reset by the similar procedure. Although the data in the loaded memory board are invalid immediately after the loading, the written data are made valid and then the status before the loading/unloading is gradually restored. |
