Creating zpool on NVMe Disks takes forever

[Tom Evans]

On Thu, Feb 19, 2015 at 12:22 PM, Michael Fuckner <michael at fuckner.net> wrote:
> On 02/19/2015 12:56 PM, Steven Hartland wrote:
>>
>> Disable trim on init:
>> sysctl vfs.zfs.vdev.trim_on_init=0
>
> this fixed it, thx!
>
> but why does it take >8h to trim 2x 400GB? Or is trimming handled
> differently on NVMe than on HDD/SSD?

TRIM/UNMAP is simply an SATA/SCSI command that is sent to a device.
What the device does when it gets that command is up to the controller
and firmware on the device.

Cheers

Tom