Bug#648367: device-mapper devices such as dm-crypt always have rotational=1; should inherit "rotational" setting from underlying devices
On Mon, Nov 14, 2011 at 02:18:53AM +0100, Stefan Lippers-Hollmann wrote:
> Hi
>
> On Monday 14 November 2011, Josh Triplett wrote:
> > Source: linux-2.6
> > Version: 3.1.0-1~experimental.1
> > Severity: normal
> >
> > I use dm-crypt on my system, and I have an SSD. The underlying disk
> > device, sda, has rotational=0:
> >
> > ~$ cat /sys/block/sda/queue/rotational
> > 0
> >
> > However, the device-mapper devices have rotational=1:
> >
> > ~$ head /sys/block/dm-*/queue/rotational
> > ==> /sys/block/dm-0/queue/rotational <==
> > 1
> [...]
> > The device-mapper devices should inherit the setting for "rotational"
> > from their underlying devices.
> >
> > - Josh Triplett
>
> While I don't know about dm-crypt specifically, that issue should be
> fixed in 3.2~rc1:
> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=commitdiff;h=4693c9668fdcec229825b3763876b4744f9e6d5e
> (it is for plain lvm2, at least)
Ah, great, thanks!
- Josh Triplett
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