I have a netbook with a small internal ssd as rpool. I have an external usb HDD with much larger storage, as a separate pool, which is sometimes attached to the netbook.
I created a zvol on the external pool, the same size as the internal ssd, and attached it as a mirror to rpool for backup. I don't care so much about it not being bootable, as long as I can read whatever data I might need in case of failure or loss. The mirror works fine, and resilvers properly and selectively when I use "zpool offline" and "zpool online" on the zvol submirror. I don't want to have the usb disk attached all the time, nor even to run with the mirror always active (usb is - just - slower than the internal ssd). I'd like to be able to move this external disk between hosts, and potentially repeat the rpool mirror for each, having them resilver whenever the disk is attached. However, with the rpool mirror in place, I can't find a way to "zpool export black". It complains that the poool is busy, because of the zvol in use. This happens regardless of whether I have set the zvol submirror offline. I expected that, with the subdevice in the offline state, the zvol would be closed. Any suggestions? Is this worth filing as a bug (is the device really offline)? Would it work differently if I used a file on the external pool, instead of a zvol? (I haven't tried that yet, but don't really expect a difference unless umount -f can help). -- Dan.
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