| 摘要 |
Method and apparatus for intelligently caching data in an intelligent disk subsystem connected to a main computer having a main memory. The disk subsystem includes a disk-cache memory having a first and a second memory bank. A first copy and a second copy of data are held in the first and second memory banks, respectively, wherein the first memory bank is coupled to a first battery and the second memory bank is coupled to a second battery. A detected failure occurring in either memory bank or either battery causes either the first copy or the second copy of data to be read, based on where a detected failure occurred. In one embodiment, successive read operations are routed to alternating memory banks. In one embodiment, read operations going to disk devices and returning data to the disk-cache memory are given a higher priority than write operations. In one embodiment, only write operation data are cached in the cache memory, but either read or write operations are completed using the data held in the cache memory. |
