Strange boot failure

Hello,

Asking hive mind: what could I forget?

I have nda1, which I wanted to remove from the system. It has GPT
partition table:

=>       40  488397088  nda1  GPT  (233G)
         40    4194304     1  zfs-main-log  (2.0G)
    4194344   41943040     2  zefs-main-arc  (20G)
   46137384    8388608     3  zfs-16tb-log  (4.0G)
   54525992   83886080     4  zfs-16tb-arc  (40G)
  138412072  134217728     5  ssd-swap  (64G)
  272629800  215767328     6  ssd-1st-rest  (103G)

I did "zpool remove zroot /dev/gpt/gfs-main-log" and
"zpool remove zroot /dev/gpt/gfs-main-arc". I edited /etc/fstab and removed
swap entry for nda1. Then I powered off the machine, removed nda1 and powered
it on again. The system went into reboot loop (the bootloader starts, I think
it starts booting the kernel, but almost immediately the system reboots). I put
nda1 back, and the system boots fine (actually I'm writing this from it).
Obviously, I forgot something. What could it be?

-- 
Alexey
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