I did it the same way on my ds220+ and it worked without any problems.
Synology
Synology
This is a place for all topics regarding Synology hard- and software - especially (but not limited to) their NAS devices.
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That's great to hear, thank you! Now I'm wondering if I should do 2 SSD and 2 HDD or 1 SSD and 3 HDD like I originally thought.
Maybe I've misunderstood the initial question. I've put in a ssd, set up DSM, put all files on it and installed a second ssd for raid1 later.
Oh I understand. I'm trying to do something different. I want to install just one SSD, do the initial set up so DSM (and any future apps) would live on it. Then in the other 3 bays I'd add the HDDs as a second volume. A potential downside to doing this would be that if the SSD fails, the NAS would fail entirely. But I don't know enough about DSM to know if that's the case.
So you now have 2 separate drives that are not mirrored?