Richard Elling wrote:
One of the benefits of ZFS is that not only is head synchronization not needed, but also block offsets do not have to be the same. For example, in a traditional mirror, block 1 on device 1 is paired with block 1 on device 2. In ZFS, this 1:1 mapping is not required. I believe this will result in ZFS being more resilient to disks with multiple block failures. In order for a traditional RAID to implement this, it would basically need to [re]invent a file system.
We had this fixed in T3 land awhile ago so I think most storage arrays don't do the 1:1 mapping anymore. It's striped down the drives. In theory, you could lose more then one drive in a T3 mirror and still maintain data in certain situations.
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