Is it possible to create RAID1 on Synology DS218 readable by other devices?

Question

Hard disks

I bought myself a Synology DS218 for reliable storage of data that I would not want to lose. After turning on the device and its initial configuration, there was no menu with a choice of RAID type, but SHR, btrfs was automatically installed.
In Storage Manager, "Change RAID Type" is disabled.
Of course, I understand that SHR is a kind of RAID1, but it is also important for me that if the storage itself is covered, then I could simply connect the hard drive to my computer and download the necessary data.
This begs the question: how to make Synology DS218 RAID1 so that the information is readable on other devices?
It is also interesting how to restore data from disks during the initial configuration (SHR) and the failure of this device, buying a new Synology and inserting disks from the old one into it, or what?

Answer 1

We care about the safety of data, this is decided by backup
If you care online, then this is decided by the second such sinologists
And you won’t be able to sit down and eat a fish
Well, you shouldn’t confuse reliability and accessibility either

Answer 2

In general, I found a solution. It turns out that it was necessary to remove several applications that were installed during the initial installation. After that, it is already possible to delete the disk pool that was also created during the initial installation, and only then you can create and select another RAID

Answer 3

Synology Hybrid RAID (SHR) is a vendor-specific redundancy implementation based on mdadm and LVM. Many people like it because it allows you to use disks of different sizes.
It has, in fact, two "levels" - SHR and SHR 2. SHR of two disks corresponds to RAID 1, SHR of three or more disks is similar to RAID 5, SHR 2 to a certain extent resembles RAID 6.
This comparison is more correct from the point in terms of space usage, but the internal organization of the data is different.
You can recover data from Synology Hybrid RAID using UFS Explorer (SHR is supported in RAID Recovery and Professional Recovery revisions):
https://rlab.ru/tools/ufs_explorer.html
If the data is badly damaged, then automation may not be enough, in this case need to contact the experts.
But I would not advise doing this, at least without first creating full images of all disks.
I myself have not tried such a trick, because. we usually work with disks or their images, but the behavior can be unpredictable - after all, if the original box did not "see" the array, then most likely the other box will not see it either and may well, for example, initialize disks.
And this already smacks of a disaster, especially if you have something like virtual machines lying there.