Failure to mirror boot drive.

[Vincent Jansen]

I have two identical usb ssd boot drives. The main one (drive A) has the normal truenas running on it but I like to make the second one (drive B) its backup by attaching it to the first.
Ive done this in the past without problems.

First I formated drive B on my mac.
placed it in the server and wiped it again.
went to system/boot/status then 3 dots and attach. selected drive B and marked it to use it all.
then I got the following error:

Attach Device​

Error: [EFAULT] concurrent.futures.process._RemoteTraceback: """ Traceback (most recent call last): File "/usr/local/lib/python3.9/site-packages/middlewared/plugins/zfs.py", line 220, in extend i['target'].attach(newvdev) File "libzfs.pyx", line 402, in libzfs.ZFS.__exit__ File "/usr/local/lib/python3.9/site-packages/middlewared/plugins/zfs.py", line 220, in extend i['target'].attach(newvdev) File "libzfs.pyx", line 2117, in libzfs.ZFSVdev.attach libzfs.ZFSException: can only attach to mirrors and top-level disks During handling of the above exception, another exception occurred: Traceback (most recent call last): File "/usr/local/lib/python3.9/concurrent/futures/process.py", line 246, in _process_worker r = call_item.fn(*call_item.args, **call_item.kwargs) File "/usr/local/lib/python3.9/site-packages/middlewared/worker.py", line 111, in main_worker res = MIDDLEWARE._run(*call_args) File "/usr/local/lib/python3.9/site-packages/middlewared/worker.py", line 45, in _run return self._call(name, serviceobj, methodobj, args, job=job) File "/usr/local/lib/python3.9/site-packages/middlewared/worker.py", line 39, in _call return methodobj(*params) File "/usr/local/lib/python3.9/site-packages/middlewared/worker.py", line 39, in _call return methodobj(*params) File "/usr/local/lib/python3.9/site-packages/middlewared/schema.py", line 985, in nf return f(*args, **kwargs) File "/usr/local/lib/python3.9/site-packages/middlewared/plugins/zfs.py", line 223, in extend raise CallError(str(e), e.code) middlewared.service_exception.CallError: [EZFS_BADTARGET] can only attach to mirrors and top-level disks """ The above exception was the direct cause of the following exception: Traceback (most recent call last): File "/usr/local/lib/python3.9/site-packages/middlewared/job.py", line 355, in run await self.future File "/usr/local/lib/python3.9/site-packages/middlewared/job.py", line 386, in __run_body rv = await self.middleware._call_worker(self.method_name, *self.args, job={'id': self.id}) File "/usr/local/lib/python3.9/site-packages/middlewared/main.py", line 1250, in _call_worker return await self.run_in_proc(main_worker, name, args, job) File "/usr/local/lib/python3.9/site-packages/middlewared/main.py", line 1169, in run_in_proc return await self.run_in_executor(self.__procpool, method, *args, **kwargs) File "/usr/local/lib/python3.9/site-packages/middlewared/main.py", line 1152, in run_in_executor return await loop.run_in_executor(pool, functools.partial(method, *args, **kwargs)) middlewared.service_exception.CallError: [EZFS_BADTARGET] can only attach to mirrors and top-level disks

no clue what went wrong.

 

[sretalla]

I can't find one of the many threads on this topic as there are so many that match to "mirror boot drive scale", but I have seen several that result in the conclusion that it's currently broken in the SCALE GUI, so you can't do what you want the way you're doing it.

What you can do (if you want to be able to boot from both drives at some point) is save your config, then re-install, selecting both drives in the install process, then restore your config.