When replacing a failed drive, only the mirror is rebuilt. In other words, the storage system controller uses the surviving drive in the mirrored pair for data recovery and continuous operation.
Data from the surviving disk is copied to the replacement disk. Most data centers require data redundancy and performance from their RAID arrays. RAID 1+0 combines the performance benefits of RAID 0 with the redundancy benefits of RAID 1. It uses mirroring and striping techniques and combines their benefits. This RAID type requires an even number of disks and the minimum is four.
RAID 10 Use Cases
If something goes wrong with one of the disks in a RAID 10 configuration, the rebuild time is very fast since all that is needed is copying all the data from the surviving mirror to a new drive. This can take as little as 30 minutes for drives of 1 TB.
Half of the storage capacity goes to mirroring, so compared to large RAID 5 or RAID 6 arrays, this is an expensive way to have redundancy.
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