have a DS1815 that has a few quirks, would like to buy the new DS1821+, theoretically you should just move the disks over and everything should be the same...... is that really the case ? are there possible problems, things to consider?

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Answer

Synology has very detailed help articles on this topic with the options and when which can be used.

https://kb.synology.com/de-de/DSM/tutorial/How_to_migrate_between_Synology_NAS_DSM_6_0_and_later#x_anchor_id22
https://kb.synology.com/de-de/DSM/tutorial/How_to_migrate_between_Synology_NAS_DSM_6_0_HDD

Answer

Yes, that is correct. Simply install the disks in the new NAS. The order does not matter (in the meantime).

Answer

No, it fits like that. 
When starting up the new NAS, pay close attention to what you press.
Don't forget that the old raid/disk will be formatted and a new volume will be created. :-)

Your data. Your choice.

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Question about Synology DS1821+

have a DS1815 that has a few quirks, would like to buy the new DS1821+, theoretically you should just move the disks over and everything should be the same...... is that really the case ? are there possible problems, things to consider?