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Definition
Multi disk storage system acting as one logical disk
Differing levels of redundancy and distribution techniques
Increased data reliability or increased input/output performance
Seen by user and OS as one single disk |
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Definition
| • Stripes data across multiple disks - If one disk fails all data is lost |
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| • No parity or mirroring - Improves speed - Striping retrieves data from storage faster |
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| • Non-redundant and Requires minimum of two drives |
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| • Block-level striping without parity or mirroring |
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| • Known as mirroring - At least two disks grouped as single volume |
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| • Only uses half of space for storage - 1:1 real time copy |
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| • Not suitable as permanent backup - All disks in this array are identical copies |
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| • Mirroring without parity or striping. |
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| • Bit-level striping with dedicated Hamming-code parity |
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| • Known as striping with dedicated parity |
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| • Blocks combined with parity blocks - Parity calculated using exclusive or (XOR) |
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| • (XOR) embedded in controller or software |
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| • Block-level striping with dedicated parity |
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| • Striped data set that is then mirrored |
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Definition
| • Minimum of four drives – 2 stripped and 2 mirror |
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Definition
| • Can involve significant computation when RW info |
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| • Also known as mirrored stripes |
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| • Mirrored data set which is then striped |
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Definition
| • Non-nested RAID type like RAID 1 in Linux – 2 drives – Read performance on RAID0 level |
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Definition
| • Data and parity bits stored across multiple disks |
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| • Data and parity bits stored across multiple disks |
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| •Provides fault tolerance |
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| • popular – loss of only one disk of capacity |
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| • As disk size grows rebuild times will take longer |
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Definition
| • Block-level striping with double distributed parity |
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| • Handles the failure of any two drives – all other drives just one |
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| • becoming more popular but greater capacity overhead |
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Definition
| •Improves rebuild times up to 2TB |
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