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4 Cards in this Set
- Front
- Back
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RAID 0 |
-uses striping. data spread across multiple devices. -one device fails, all devices fail. -increases read/write speeds. -size = < drive x n drives.
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RAID 1 |
-Data from one partition is duplicated on two identical drives. -mirroring or duplexing: mirroring= two drives share one controller; duplexing= each drive has own controller. -fault tolerance and quick failure recovery -storage overhead consumes half available space. -read can be split between two devices increasing read speed. -loss of write speed. |
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RAID 5 |
-Data spread byte by byte across differect drives. -parity information also spread across drives. -needs at least three disk drives with same capacity and same type. -if one drive fails the missing data can be reconstructed, but only after the drive has been replaced and gone through the reconstruction process. -disk performance enhanced because of simultaneous read and write. -parity calculations create write performance overhead. -more drives, less overhead, 1/3 for 3 1/10 for 10. -even of multiple drive failures all data recoverable. |
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RAID 10 |
-RAID 1+0. combines raid 1 and 0 -uses mirroring from level 1 and stripping from 0 -minimum of 4 disks, in two disk mirrored blocks. -better performance and system redundancy. |
