Question about /efiboot & /efigpt

[D-FENS]

A swap file is not swap partition, perhaps it lesser dangerous, is it?

Dangerous? A swap partition is not dangerous. It is a differently formatted swap but does the same job. There might be performance advantages when using swap partitions instead of swap files but not always and not necessarily. It is a complex topic.
In general both swap files and swap partitions do the same job.

Anyway, the discussion is way off topic, so let's stay focused on solving the misterious files!

 

[T-Aoki]

Dangerous? A swap partition is not dangerous. It is a differently formatted swap but does the same job. There might be performance advantages when using swap partitions instead of swap files but not always and not necessarily. It is a complex topic.
In general both swap files and swap partitions do the same job.

Anyway, the discussion is way off topic, so let's stay focused on solving the misterious files!

Creating swap file(s) on ZFS or creating swap partition(s) on ZVOL are catastrophically dangelous, at least on FreeBSD, although possilby safe in carefully crafted configuration only.
ZFS eats up a huge amount of memory and possibly become short on free memory to handle swap job.
Be sure to create swap partition(s) on raw partition and create swap file(s) on UFS.

 

[freezr]

Dangerous? [...]

Anyway, the discussion is way off topic, so let's stay focused on solving the misterious files!

Bad selection of words, I had better using risky instead of dangerous.

I don't what happened, the only weird thing I do during the installation process was to set swap to 0, after that the installer created 3 times the partitions boot and EFI, it associate the partition to the zpool but did not attached nor encrypted the second disk. Eventually I fixed the problem, but now I should recreate a virtual installation to see if having three disks and setting ZFS on root without swap ends up in my same state.

 

[D-FENS]

Bad selection of words, I had better using risky instead of dangerous.

I don't what happened, the only weird thing I do during the installation process was to set swap to 0, after that the installer created 3 times the partitions boot and EFI, it associate the partition to the zpool but did not attached nor encrypted the second disk. Eventually I fixed the problem, but now I should recreate a virtual installation to see if having three disks and setting ZFS on root without swap ends up in my same state.

Regarding swap: The only difference between file and partition would be performance in my opinion. I don't think any option would be safer or more reliable than the other.
Regarding installation: If you want to play with it, go ahead. I would not waste more time on it. My guess is you probably did something unintentionally that ended up in the described state. It would probably not be repeatable.