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RAID 1 TO RAID 5 CONVERSION

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DomBenson

The risk with using different models is that, rather than reducing the impact of defects, you increase the chance that you will be affected by them, as you are exposed to two sources.
It can also make performance worse, as the RAID controller has to accommodate the lowest common denominator for each operation.
To reduce the risk of multiple failures occurring in a short window, periodically migrating between hot spares can help, as is causes all the disks to have different wear profiles. Staying on top of SMART data (for SATA drives) is also a must!