From what I read, ARM 64 bit started with armv8 but my RPI 3B outputs
$ uname -a
Linux raspberrypi 4.14.98-v7+ #1200 SMP Tue Feb 12 20:27:48 GMT 2019 armv7l GNU/Linux
so I thought, it’s 32 bit.
Maybe it’s not the latest revision? 
How does this corruption happen exactly? Does the data integrity actually damaged?
And is this a problem of mongoDB-writes or SD cards in general? Shouldn’t SD cards be writable just like SSDs?
That’s correct. I just found that RPI 3 still has armv7 while RPI 3 model B+ has already armv8 which is why it can run Ubuntu Server 64 bit.
SD cards have limited amount of writes, so when writing very much data like MongoDB does, SD card gets corrupted.
SSD and HDD works with very many writes.
Also running Meteor node+mongodb on arm64 Android Phone works:
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