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Date:	Mon, 06 May 2013 11:34:58 +0200
From:	Philipp Reisner <philipp.reisner@...bit.com>
To:	Chris Boot <bootc@...tc.net>
Cc:	Lars Ellenberg <lars.ellenberg@...bit.com>,
	linux-kernel@...r.kernel.org
Subject: Re: drbd: kernels 3.7 => 3.8 broken userspace compatibility

Am Montag, 6. Mai 2013, 09:59:08 schrieb Chris Boot:
> Hi all,
> 
> I upgraded from a 3.7.x kernel to a 3.8.x kernel on a test machine
> running DRBD, and found myself unable to bring up my DRBD devices. I'm
> using the 8.3.13 userspace tools as shipped in Debian Wheezy, which work
> fine on the 3.7 kernel, but they appear to hang when using the 3.8
> kernel and cannot set up the device.
> 
> The 3.8 kernel appears to introduce drbd 8.4.2 rather than the 8.3.13
> available in 3.7.
> 
[...]
> Even if the kernel did require new userspace tools, should there not be
> some better mechanism to notify the user they must upgrade them before
> things will work? At the moment all I see without strace is:
> 
> # drbdadm attach r0
> DRBD module version: 8.4.2
>    userland version: 8.3.13
> you should upgrade your drbd tools!
  ^^^^
This message is a clear hint, isn't it?

See also https://lkml.org/lkml/2012/11/9/103

Fitting user space tools are available since 2011. The new tools
can deal with both interfaces.

Best,
 Phil
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