Problems adding Intel 750 to zfs pool

Steven Hartland killing at
Mon Jul 20 09:28:43 UTC 2015

This will almost certainly be due to slow TRIM support on the device.

Try setting the sysctl vfs.zfs.vdev.trim_on_init to 0 before adding the 

On 18/07/2015 05:35, dylan at wrote:
> Hi,
> I've installed an Intel 750 400GB NVMe PCIe SSD in a Dell R320 running 
> FreeBSD 10.2-beta-1... not STABLE, but not far behind, I think. 
> Apologies if this is the wrong mailing list, or if this has been fixed 
> in STABLE since the beta.
> Anyway, I've gparted it into 2 partitions - 16GB for slog/zil and 
> 357GB for l2arc. Adding the slog partition to the pool takes about 2 
> minutes - machine seems hung during that time. Ping works, but I can't 
> open another ssh session.
> Adding the l2arc doesn't seem to complete - it's been going 10 minutes 
> now and nothing. Ping works, but I can't log in to the local console 
> or another ssh session.
> I'm adding the partitions using their gpt names. i.e.
> zpool add zroot log gpt/slog
> zpool add zroot cache gpt/l2arc
> The system BIOS is up-to-date. The OS was a fresh 10.1 install, then 
> freebsd-update to 10.2-beta2. 10.1 exhibited the same symptoms.
> Root is on zfs.
> Device was tested to be working on Windows 8.1 on a Dell T1700 
> workstation.
> Any ideas?
> Cheers,
> Dylan Just
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