Check status of background destroy

[Freddie Cash]

On Wed, Jan 4, 2017 at 10:43 AM, Xin LI <delphij at gmail.com> wrote:

> Try setting vfs.zfs.free_max_blocks to 100000 (this is an arbitrary
> number, can be larger, limits maximum blocks being freed per txg; see
> https://svnweb.freebsd.org/base?view=revision&revision=271532 for
> details).
>
> You can inspect the progress with DTrace by looking at zfs-dbgmsg.
>

​This is looking promising.

Booting off an 11.0-based mfsBSD didn't work (locked up after "Trying to
mount root from /dev/md0").

Booting off a 10.3-based mfsBSD worked.  Set that sysctl, then imported the
pool without issues.  The box has now been running for just over 24 hours.

ARC is sitting at 93 GB, with Wired at 116 GB.  Previously, the ARC would
only be around 10 GB with Wired over 120 GB.  "zpool iostat" shows lots of
reads and writes happening to the pool.  And the Avail space is slowly
ticking upwards.

Now just need to wait and see how long it takes to free up all 40 TB of
referenced space.  :)

Thanks for the info!



-- 
Freddie Cash
fjwcash at gmail.com