A performance caching technique in which the completion of a write request is signaled as soon as the data is in cache; Actual writing to the disk occurs at a later time. Since the operating system is "fooled" into thinking that the write has actually been written to disk, there is a risk of losing or corrupting data in cache should an error or power failure occur. Therefore, use of a battery-backed cache is recommended to prevent such data loss/ corruption.
locations in cache memory are grouped together in blocks and when it is necessary to update main memory to reflect changes in the cache, the entire block of main memory is updated rather than just individual locations. [SILC99][TOP OF THE PAGE] [TOP OF THE PAGE] [TOP OF THE PAGE
A type of cache memory scheme that stores data written to disk as well as data read from disk.
Many modern disk controllers have several megabytes of cache on board. Onboard cache gives the controller greater freedom in scheduling reads and writes to disks attached to the controller. In write-back mode, the controller reports a write operation as complete as soon as the data is in the cache. This sequence improves write perforÂmance at the expense of reliability. Power failures or system crashes can result in lost data in the cache, possibly corrupting the file system.
Upon a cache hit, the cache is updated and the main memory is not affected. Upon a cache miss, only the main memory is updated.
A technique used in cache design for writing information back intomain memory. In a write-back cache, the cache stores the changed block of data, but only updates main memory under certain conditio ... more
