Redundant Array of Independent (or Inexpensive) Disks. Type of disk, often used on servers, where several physical disks are combined into an array for better speed and fault tolerance.
Level 0 - implements data striping where file blocks are written to separate drives. Does not provide fault tolerance, because failure of one drive will result in data loss.
Level 1 - implements data mirroring. Data is duplicated on two drives either through software or hardware. Provides faster read performance than a single drive.
Level 2 - not used in practice. Data is split at bit level at written to multiple drives.
Level 3 - requires at least 3 drives. Data block is striped at byte level across drives and error correction codes (parity info) is recorder on another drive. Provides fault tolerance but slower writing performance.
Level 4 - Similar to Level 3 but provides faster performance because it uses blocks for striping.
Level 5 - Similar to Level 4 but improves performance but also striping parity info across multiple drives.
Level 6 - Similar to Level 5 but also uses second parity scheme for better fault tolerance.
Level 7 - Proprietary RAID design by Storage Computer Corporation. Faster than other levels because it uses multiple levels of cache and asynchronous I/O transfers. In addition multiple RAID levels can be combined to improve performance or reliability.
- 0 utilizatori au considerat informația utilă
Articole similare
Radio Button
A form field that presents the user with a selection that can be chosen by clicking on a button....
Registered User
A user of a Website with a recorded name and password.
Relative URL
The Internet address of a page or other World Wide Web resource with respect to the Internet...
Root web
To access the root web, you supply the URL of the server without specifying a page name.
Row
In a table, a horizontal collection of cells.
