> Ok.. short comparison, using a single disk as baseline. Good chart, perhaps you should also mention the capacity. With this I mean what happens. 1 disk = 1TB for simplicity. >using 2 disks >raid0: (striping) > ++ double read throughput, > ++ double write throughput, > -- half the reliability (read: only use with good backup!) Capacity: 2TB >raid1: (mirroring) > ++ double read throughput. > o same write throughput > ++ double the reliability Capacity: 1TB >using 3 disks: >raid0: striping > +++ tripple read performance > +++ tripple write performance > --- third of reliability Capacity: 3TB >raid1: mirroring > +++ tripple read performance > o same write throughput > +++ tripple reliability Capacity: 1TB >raid5: (distributed parity) > +++ tripple read performance > - lower write performance (not due to the second write but due > to the necessary reads) > + sustains failure of any one drive in the set Capacity: 2TB >using 4 disks: >raid1+0: > ++++ four times the read performance > ++ double write performance > ++ double reliability Capacity: 2TB Raid5: > +++ four times the read performance > - lower write performance (not due to the second write but due > to the necessary reads) > + sustains failure of any one drive in the set Capacity: 3TB
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