This is similar to this question:
HP G8 migrate RAID0 to RAID1 with CLI commands
But different enough that I think it is worth asking as a new question.
I have a Gen 10 HPE server with the P408i-a RAID controller.
Currently it just has a single disk, which it is treating as a 1 disk RAID0 array.
I want to add two more disks to it, and convert the result to a RAID5 array.
From ssacli, I can see "add" and "modify" options, but it isn't that clear how to combine this to do what I want.
In particular, under the help for the "add" command, it says "adding physical drives is the same as expanding an array", which to me implies that as soon as I run the "add", it will start a conversion to a 3 disk RAID0, which isn't what I want.
If I add the new drives as spares, and then run the modify command, will that work (i.e. will it work out it needs to absorb the spares to do the conversion)?