Unable to export pool - /var/db/system/syslog-127b3ac88ebd45cc8152eb1d50a360da': Device busy

[victorhooi]

Hi,

I'm trying to diagnose a potential data-loss issue with my FreeNAS 11.x instance.

I'm trying to export the ZFS pool in question ("datastore") so that I can re-import it as read-only.

I've unmounted the main volume from the pool - but I'm unable to actually export the pool:

Code:

sudo zpool export datastore
Cannot unmount '/var/db/system/syslog-127b3ac88ebd45cc8152eb1d50a360da': Device busy

Is there some way of safely exporting the pool?

Regards,
Victor

 

[danb35]

Is there a reason you aren't doing the export through the GUI?

 

[victorhooi]

Basically I seem to have lost a number of my datasets since installing FreeNAS 11.X and importing my pool (and doing a zpool upgrade via the GUI):

https://forums.freenas.org/index.ph...1-multiple-volumes-missing.55072/#post-383787

Hence, super-paranoid right now about what FreeNAS is doing.

I've unmounted the "datastore" volume manually via the command-line.

Is it safe to do an export via the FreeNAS GUI?

As in, it won't forcibly remount datastore, or do a whole bunch of writes or things like that? Trying to preserve things.

Regards,
Victor

 

[danb35]

Is it safe to do an export via the FreeNAS GUI?

I'd expect so, but I understand your concern. What's going on is that the .system dataset is on your pool (FreeNAS puts it there as soon as you create a pool, as the continuous writes to a USB boot device aren't usually a good thing), and files on that dataset are active. If you put it somewhere else, you should be able to export the pool.

 

[victorhooi]

Is there a way to move it from the CLI on a running system?

Or is it safe to force unmount it? (Or will force-unmount syslog cause all sorts of weirdness).

 

[victorhooi]

Otherwise if not, I will simply detach the volume from the GUI (which I assume is the same as export).

 

[danb35]

Or will force-unmount syslog cause all sorts of weirdness

I think it probably would, and no, I don't know of a way to move it from the CLI.