buffer cache - ορισμός. Τι είναι το buffer cache
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Τι (ποιος) είναι buffer cache - ορισμός

SOFTWARE-BASED, BLOCK-LEVEL CACHE OF DRIVE DATA STORED IN THE HOST COMPUTER'S MAIN MEMORY
Pagecache; Page Cache; Page caching; Disk page; Buffer cache

Disk buffer         
  • On this hard disk drive, the controller board contains a RAM integrated circuit used for the disk buffer.
  • A 500 GB [[Western Digital]] hard disk drive with a 16 MB buffer
HIGH-SPEED MEMORY EMBEDDED IN A COMPUTER DRIVE USED TO IMPROVE PERFORMANCE
Force Unit Access; Read-ahead; Read-behind
In computer storage, disk buffer (often ambiguously called disk cache or cache buffer) is the embedded memory in a hard disk drive (HDD) acting as a buffer between the rest of the computer and the physical hard disk platter that is used for storage. Modern hard disk drives come with 8 to 256 MiB of such memory, and solid-state drives come with up to 4 GB of cache memory.
buffer state         
COUNTRY LOCATED BETWEEN TWO OTHER MUTUALLY HOSTILE COUNTRIES
Buffer State; Buffer states; Buffer republic; Buffer colony
(buffer states)
A buffer state is a peaceful country situated between two or more larger hostile countries.
Turkey and Greece were buffer states against the former Soviet Union.
N-COUNT
buffer state         
COUNTRY LOCATED BETWEEN TWO OTHER MUTUALLY HOSTILE COUNTRIES
Buffer State; Buffer states; Buffer republic; Buffer colony
¦ noun a small neutral country situated between two larger hostile countries.

Βικιπαίδεια

Page cache

In computing, a page cache, sometimes also called disk cache, is a transparent cache for the pages originating from a secondary storage device such as a hard disk drive (HDD) or a solid-state drive (SSD). The operating system keeps a page cache in otherwise unused portions of the main memory (RAM), resulting in quicker access to the contents of cached pages and overall performance improvements. A page cache is implemented in kernels with the paging memory management, and is mostly transparent to applications.

Usually, all physical memory not directly allocated to applications is used by the operating system for the page cache. Since the memory would otherwise be idle and is easily reclaimed when applications request it, there is generally no associated performance penalty and the operating system might even report such memory as "free" or "available".

When compared to main memory, hard disk drive read/writes are slow and random accesses require expensive disk seeks; as a result, larger amounts of main memory bring performance improvements as more data can be cached in memory. Separate disk caching is provided on the hardware side, by dedicated RAM or NVRAM chips located either in the disk controller (in which case the cache is integrated into a hard disk drive and usually called disk buffer), or in a disk array controller. Such memory should not be confused with the page cache.