ZFS pool not found after partition resize with gpart

Hello,

I had the following partition scheme:
ada0:
ada0p1 freebsd-boot
ada0p2 freebsd-swap
ada0p3 freebsd-zfs

ada0p3 had a size of ~1TB, and after I resized this partition to 500GB using gpart, the boot loader cannot found my zfs pool. What should I do to fix my boot loader and my zfs pool?

Thank you.
 
ZFS does not support shrinking(especially if you do it without a zpool command), you will have to restore from backup. The only way to shrink a pool (with zfs in base) is to replicate it to a smaller pool.
 
ada0p3 had a size of ~1TB, and after I resized this partition to 500GB using gpart, the boot loader cannot found my zfs pool. What should I do to fix my boot loader and my zfs pool?

Try to put the old size value back, assuming you recorded the output of gpart backup ada0 . Maybe this works. As it has been already said, never shrink ZFS partition! You can grow it easily when you have free space left.
 
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