Re: Trying to read linux-lvm on 11.0-RC2 using geom, bhyve, fail.

[Andrey V. Elsukov]

On 15.09.2016 08:10, Zaphod Beeblebrox wrote:
> After this fail, I decided I didn't really _need_ to run linux here and I
> discovered 'geom_linux_lvm.ko' ... cool.  But fail, too.  Doesn't emit any
> messages.  I even enabled the debug messages for it.
> 
> The linux disk is partitioned thusly:
> 
> =>63  1953525105  ada1  MBR  (932G)
>   631985- free -  (993K)
> 2048  1953523120 1  linux-data  [active]  (932G)

Probably it isn't LVM or some modern version, which isn't supported by
module. With enable kern.geom.linux_lvm.debug=1 module will complain
only if it will find magic string "LABELONE" in the metadata.
You can check what is stored in the metadata with the following command:
# dd if=/dev/ada1s1 count=1 | hexdump -vC

-- 
WBR, Andrey V. Elsukov



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Re: Trying to read linux-lvm on 11.0-RC2 using geom, bhyve, fail.

[Zaphod Beeblebrox]

On Fri, Sep 16, 2016 at 1:06 AM, Allan Jude  wrote:

> On 2016-09-16 01:04, Zaphod Beeblebrox wrote:
> >
> >
> >
> > Are you using zvols to back the VMs? Make sure they are in
> 'volmode=dev'
> > not 'geom' (the default), or GEOM will lock the device when it
> detects a
> > partition table being written to the zvol (from the installer inside
> > the VM)
> >
> > Note that this setting requires you to export/import the pool or
> reboot
> > to apply.
> >
> >
> > No, no.  The whole point here is that I was booting the raw disk.
> > "ada1" as it were.
> >
>
> You might try the dangerous 'shoot yourself in the foot mode' for geom:
>
> man 4 geom:
> 0x10 (allow foot shooting)
> Allow writing to Rank 1 providers.  This would, for example,
> allow the super-user to overwrite the MBR on the root disk or
> write random sectors elsewhere to a mounted disk.  The
> implications are obvious.
>
>
> sysctl kern.geom.debugflags=16
>
> I get where you're going here, but it doesn't apply because at this point
> I'm not even booting from ada1.
>
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Re: Trying to read linux-lvm on 11.0-RC2 using geom, bhyve, fail.

[Allan Jude]

On 2016-09-16 01:04, Zaphod Beeblebrox wrote:
> 
> 
> 
> Are you using zvols to back the VMs? Make sure they are in 'volmode=dev'
> not 'geom' (the default), or GEOM will lock the device when it detects a
> partition table being written to the zvol (from the installer inside
> the VM)
> 
> Note that this setting requires you to export/import the pool or reboot
> to apply.
> 
> 
> No, no.  The whole point here is that I was booting the raw disk. 
> "ada1" as it were.
>  

You might try the dangerous 'shoot yourself in the foot mode' for geom:

man 4 geom:
0x10 (allow foot shooting)
Allow writing to Rank 1 providers.  This would, for example,
allow the super-user to overwrite the MBR on the root disk or
write random sectors elsewhere to a mounted disk.  The
implications are obvious.


sysctl kern.geom.debugflags=16

-- 
Allan Jude



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Re: Trying to read linux-lvm on 11.0-RC2 using geom, bhyve, fail.

[Zaphod Beeblebrox]

> Are you using zvols to back the VMs? Make sure they are in 'volmode=dev'
> not 'geom' (the default), or GEOM will lock the device when it detects a
> partition table being written to the zvol (from the installer inside the
> VM)
>
> Note that this setting requires you to export/import the pool or reboot
> to apply.
>

No, no.  The whole point here is that I was booting the raw disk.  "ada1"
as it were.
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Re: Trying to read linux-lvm on 11.0-RC2 using geom, bhyve, fail.

[Allan Jude]

On 2016-09-15 01:10, Zaphod Beeblebrox wrote:
> I'm converting some Xen/Debian/Windows domain servers to
> FreeBSD/Bhyve/Samba domain servers. Windows is still required for a couple
> of applications, but I've recently had enough success with Samba4 to try
> this.  Not the problem.
> 
> The machines have two disks (was RAID-1 before, will be RAID-1 after) and
> I've run the FreeBSD install on one disk leaving the other alone.  I'd like
> to copy off some of what's on the other disk, so I set about trying to read
> it.
> 
> BHYVE ATTEMPT
> 
> Believe-it-or-not, I tried bhyve first.  Being the more complex solution,
> of course.  I tried booting the other disk in bhyve.  I chalked that
> failure up to it still being a Xen config... wasn't sure how that would
> boot for fail under bhyve... so I grabbed a debian live CD from the net and
> tried to boot it.
> 
> Now, I'm following the directions from
> https://www.freebsd.org/doc/handbook/virtualization-host-bhyve.html ...
> 
> And the error both times was failing to find init.  Both booting the CD
> _and_ booting the disk.
> 
> I can't seem to find any further documentation on my problem.  Linux boots
> to it's initrd filesystem state and fails to leave it because it (claims
> it) can't find /sbin/init (even though in the CD case, it's there)
> 
> GEOM ATTEMPT
> 
> After this fail, I decided I didn't really _need_ to run linux here and I
> discovered 'geom_linux_lvm.ko' ... cool.  But fail, too.  Doesn't emit any
> messages.  I even enabled the debug messages for it.
> 
> The linux disk is partitioned thusly:
> 
> =>63  1953525105  ada1  MBR  (932G)
>   631985- free -  (993K)
> 2048  1953523120 1  linux-data  [active]  (932G)
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> 

Are you using zvols to back the VMs? Make sure they are in 'volmode=dev'
not 'geom' (the default), or GEOM will lock the device when it detects a
partition table being written to the zvol (from the installer inside the VM)

Note that this setting requires you to export/import the pool or reboot
to apply.

-- 
Allan Jude



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