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I'm not talking about generic RAID. I'm talking specifically about mdadm, where there are two sources (the one in my question as well as neil.brown.name/blog/20090817000931 saying that specifically this is possible). I'll gladly accept your answer if you can provide a definitive source disproving my two sources.
– Sixtyfive
Commented Jun 16, 2021 at 16:04
@Sixtyfive Your source specifically mentions REDUCING the number of devices in an existing array. Not creating a new array already reduced...Although I only mention this after a quick scan of your source and am not any sort of authority on disk arrays. EDIT: Also mentions that the feature is not working on RAID 5 and might be working somewhere some sunny day
– mishan
Commented Jun 16, 2021 at 16:09
1

I'm guessing the result of that 2-disk conversion would be a "degraded" RAID5 array (i.e. the same as if a normal RAID5 had lost a disk), which then needs to be brought back to normal by adding the 3rd (parity) disk.
– grawity_u1686
Commented Jun 16, 2021 at 16:09
thank you, added the word "degraded" to my question to indicate that i'm aware of this not being "proper".
– Sixtyfive
Commented Jun 16, 2021 at 16:12

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