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Discussion in 'Tech Talk' started by SanduneCC, Sep 30, 2004.
and who needs it?
servers need it. and maybe some research high-end computing stuff.
It's essentially a method of data redundancy. In its most basic form, you need 3 disks to implement a RAID-5 array. The array is presented to the OS as one logical disk. Data is written across all disks in the array, along with a parity calculation for data integrity.
The end result is basically that if a disk in a RAID-5 array blows up, your data is still safe (and accessible). Most hardware RAID systems allow for hot-swapping, so you just pull the old drive out, stick the new one in, and keep going (taking a temporary performance hit while the lost data is being rebuilt). RAID-5 is a decent balance between performance and integrity. In terms of actual storage space, you lose the equivalent of 1 drive in the array, so if you have 3 80GB drives, you get 160GB of storage.