Please add a Option to use raw DISK on replace a failed one

[arogarth]

Describe the feature would like to see added to OpenZFS

We have a ZFS created with FreeBSD years ago and migrate the machine to Ubuntu with OpenZFS - all works well.
Now some disks failed and we cannot replace them... WHY?

Creating the zfs with FreeBSD the whole raw disk was used as a device without partitioning. On replacing the DIsk with OpenZFS it is creating a partition table. Now the 8M at the end are missing for compatibility to the old setup.

This feature should only be used on replacing disks... And yes we know that the sectors should be equal or greater than the old failed one.

How will this feature improve OpenZFS?

Better compatibility to old ZFS created with BSD systems

Additional context

[ghost]

I agree, we need way to opt out of automatic partitioning on Linux, but I'm not sure how to do it. Maybe a tunable would work as a bare minimum.

[arogarth]

On replace - check the original disk - zdb list the informations of the partitioning... if the disk wasnt splitted into partition - don't do it and add the whole disk...

[scineram]

Remove partitioning crap from Linux. As @amotin suggested long ago.

[jumbi77]

+1 for that.
FYI: Referencing #6277 #3452 #94

And also in a broader context #11029 #11408

[shodanshok]

@scineram I agree with you, but an option to opt in/out partition creation would be very useful especially when replacing a disk (if autodetection as suggested by @arogarth fails).

[pepa65]

As a (hopefully temporary) workaround:
#94 (comment)

[ehem]

Since I came up with the workaround almost 8 years ago, we're out of temporary. Perhaps once a month we simply need to add comments about "rip it out".

Rip it out!
Rip it out!
Rip it out!