write-back cache


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write-back cache

A disk or memory cache that supports writing. Data normally written to memory or to disk by the CPU is first written into the cache. During idle machine cycles, the data are written from the cache memory to main memory or to disk. Write-back caches improve performance, because writing to the cache is faster than writing to main memory or disk.

Disk Writes
A disk write-back cache does add a slight amount of risk, because the data remain in volatile memory longer. When the computer is turned off, the operating system ensures that the data written to the cache are saved before powering down. See write-through cache and cache.
References in periodicals archive ?
The first involves the integrity of the data in the write-back cache during a power failure event.
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This can be used to implement a periodic write-back cache mechanism allowing the server to smooth out demand spikes and optimize throughput.
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Data written to a write-back cache is vulnerable until it is made permanent on disk, which is done later as a background task when spare cycles are available.