When using RAID1, is it best practice to buy spare disks at the same time as the original disks to ensure you have the identical type in case they become unavailable in future?
Answer
You won't need an identical type.
The only "hard" requirement with RAID controllers is that the replacement disk is the same bus type (do not replace SAS disks with SATA or vice-versa) and at least the size of the original disk. Software RAID solutions would not even enforce the same bus type.
It makes sense to have similar performance characteristics (rotational speed, peak transfer rate, access times) on all members of an array so you would not give away performance, but if you replace a slower disk with a faster one, this is of no concern.
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