Date: Thu, 26 Mar 2020 14:07:39 +0000 From: Gary Palmer <gpalmer@freebsd.org> To: mike tancsa <mike@sentex.net> Cc: Attila Nagy <bra@fsn.hu>, freebsd-fs@freebsd.org Subject: Re: Importing a vdev copied zpool from file Message-ID: <20200326140739.GB98069@in-addr.com> In-Reply-To: <616f6969-b137-7db6-894f-f7612e67abcd@sentex.net> References: <CAM2hQG_iREkW=tsX=rF8XCOe1CFxumbftr7am6uZ0X6u-YFKQw@mail.gmail.com> <616f6969-b137-7db6-894f-f7612e67abcd@sentex.net>
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On Thu, Mar 26, 2020 at 08:59:17AM -0400, mike tancsa wrote:
> On 3/25/2020 7:29 PM, Attila Nagy wrote:
> > Hi,
> >
> > I'm wondering, why this doesn't work and what could be done to make it work?
> >
> > # dd if=/dev/da0 of=/data/da0
>
> What if you add the step
>
> mdconfig *-o async*??-t vnode -f /data/da0
>
> and then try the import ? Note, the async option adds a pretty big speed
> increase
At least on 11.3, that option has this caveat in the man page:
-o [no]option
Set or reset options.
[no]async
For vnode backed devices: avoid IO_SYNC for increased
performance but at the risk of deadlocking the entire
kernel.
Not sure if the risk of deadlocking the kernel is still there or if it's
worth any potential speedup
Regards,
Gary
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