External USB Harddisk ZFS boot problem

[Hans Petter Selasky]

On 10/17/15 19:08, Philipp Maechler wrote:
> Good evening,
>
> I have a problem and a manual an nasty work around, and like to have
> some hints how/where to digg deeper.
>
> FreeBSD 10.2  (GENERIC freshly installed) and root zfs pool on a
> external usb harddisk drive. I try to boot from this zfs pool. More
> details about the hardware further down.
>
> This zfs pool is a zfs send/receive copy of a working zfs boot setup
> (but it was before an 10.1 - note to myself: never change 2 things at
> the same time [duplicate])
>
> The new harddisk is setup properly (boot-loader etc) and also the zpool
> cache file is correctly up-to-date and the bootfs property is set.
>
> What happens is that the boot loader works fine, then it loads the
> kernel and the kernel starts. At this time, the drive switch off and the
> kernel loads further and starts to wait for root an usbus0 and usbus1
>

Hi,

It is not easy to say why your disk is powering down. I know the ZFS 
uses some more SCSI commands like SYNCHRONIZE cache which UFS doesn't in 
the same way. Did you try to edit sys/dev/usb/quirk/usb_quirk.c and add 
a UQ_MSC_NO_SYNC_CACHE for your disk?

--HPS