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To: freebsd-fs@freebsd.org
Subject: Re: Creating zpool on NVMe Disks takes forever
References: <54E5BB12.3060707@fuckner.net>
Date: Thu, 19 Feb 2015 12:08:00 +0100
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From: "Ronald Klop" <ronald-lists@klop.ws>
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On Thu, 19 Feb 2015 11:29:38 +0100, Michael Fuckner <michael@fuckner.net>  
wrote:

> Hi,
>
> I have two NVMe PCIe Cards in a System running 10.1-p5.
>
> root@s4l:~ # ll /dev/nv*
> crw-r-----  1 root  operator  0x63 Feb 19 08:51 /dev/nvd0
> crw-r-----  1 root  operator  0x67 Feb 19 08:51 /dev/nvd1
> crw-------  1 root  wheel     0x30 Feb 19 08:51 /dev/nvme0
> crw-------  1 root  wheel     0x5c Feb 19 08:51 /dev/nvme0ns1
> crw-------  1 root  wheel     0x31 Feb 19 08:51 /dev/nvme1
> crw-------  1 root  wheel     0x62 Feb 19 08:51 /dev/nvme1ns1
>
> I can partition/format the disks with UFS and access them without  
> issues, but I can't create a zpool. It simply takes forever when I enter  
> the following command:
>
> zpool create tank0 mirror nvd0 nvd1
>
>
> Any idea what to check?
>
> Regards,
>   Michael!

I don't have NVMe and don't know if you use HDDs or SSDs or something else  
even.
So, just a guess:
sysctl vfs.zfs.vdev.trim_on_init

Regards,
Ronald.