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Date:      Tue, 22 Dec 2009 13:19:20 -0600
From:      Scot Hetzel <swhetzel@gmail.com>
To:        krad <kraduk@googlemail.com>
Cc:        Mel Flynn <mel.flynn+fbsd.current@mailing.thruhere.net>, freebsd-current@freebsd.org, Andriy Gapon <avg@icyb.net.ua>
Subject:   Re: Some notes on RootOnZFS article in wiki
Message-ID:  <790a9fff0912221119ve4ab385me528ffd8ab1b50b8@mail.gmail.com>
In-Reply-To: <d36406630912220805l7f45e6c5gedbd6994255f907d@mail.gmail.com>
References:  <200912210600.46044.mel.flynn%2Bfbsd.current@mailing.thruhere.net> <790a9fff0912211047w6e0ee46co420869f25a7a016d@mail.gmail.com> <d36406630912220302o5161dd50i45b69bd5003ad386@mail.gmail.com> <4B30D75D.6010708@icyb.net.ua> <d36406630912220805l7f45e6c5gedbd6994255f907d@mail.gmail.com>

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On 12/22/09, krad <kraduk@googlemail.com> wrote:
>
>
> 2009/12/22 Andriy Gapon <avg@icyb.net.ua>
>
> > on 22/12/2009 13:02 krad said the following:
> >
> > >
> > > Are there still issues with using zvols for swap? If not you don't need
> a
> > > slice for swap and can get rid of gmirror entirely.
> >
> > Is this supported at all _on FreeBSD_?
> > Even, if yes, one drawback is that you wouldn't be able to use zvol swap
> as a dump
> > device.
> >
> >
> > --
> > Andriy Gapon
> >
>
> Even is you use a dedicated zvol for crashdump only?
>

Opensolaris uses a seperate zvol for crash dumps, so I gave it a  try
and created a zvol.

zfs create -V 8G zroot/dump
zfs set checksum=off zroot/dump

But when dumpon executes, it tells you that dumps are not supported to
zfs zvolumes.

dv8t01# dumpon /dev/zvol/zroot/dump
dumpon: ioctl(DIOCSKERNELDUMP): Operation not supported

Scot



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