zfs drive keeps failing between export and import

[David Ehrmann]

On Fri, Jan 16, 2009 at 3:33 AM, Pete French
<petefrench at ticketswitch.com> wrote:
>> a software problem before hardware.  Both drives are encrypted geli
>> devices.  I tried to reproduce the error with 1GB disk images (vs
>
> This is probably a silly question, but are you sure that the drives
> are not auto detaching ? I had big problems with a zfs mirror on top
> of geli which turned out to be that drives mounted using "geli_devices"
> in rc.conf will auto detach unless you set "geli_autodetach" to NO.

Not silly at all.  I didn't know that could be an issue, but they
weren't mounted with "geli_devices," they were mounted by hand with
"geli attach /dev/ad<disk>."  I did not set the -d flag on attach, and
I don't think I used the -l flag on detach, either.  Listing the
device says this:

Geom name: ad10.eli
EncryptionAlgorithm: AES-CBC
KeyLength: 128
Crypto: hardware
UsedKey: 0
Flags: NONE

(and more stuff)

One more interesting thing: I accidentally rebooted the system without
any detaching/exporting (it involved a different, bad drive).  When it
came up, I was able to re-import tank without any problems.