I/O Policy(RAID Settings).

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I/O Policy(RAID Settings).

  • The I/O policy determines whether the RAID controller will cache data, which can reduce access times if successive read requests are made to the same blocks of data.

Direct I/O

  • Direct I/O mode is recommended in most cases. Most file systems and many applications have this option their own cache and do not require data caching at the RAID controller level.

Cached I/O

  • In buffered I/O mode, the controller caches both read and write requests. If there are consecutive read requests to the same data blocks are read from the RAID cache instead of the hard disk. This mode may be required if the application or file system does not cache read requests.

Related Pages:

  1. Ustawienia RAID mające wpływ na wydajność (Jak poprawić wydajność RAID?)(Ustawienia RAID)
  2. Polityka zapisu - Write Cache Policy (Write-Back oraz Write Through)(Ustawienia RAID)
  3. Polityka pamięci podręcznej dysku - Disk Cache Policy (Ustawienia RAID)
  4. Polityka Czytanie z wyprzedzeniem - Read Ahead Policy (Ustawienia RAID)