regarding Bug#573073: delay at creating lvm devices
mbroz at redhat.com
Sun Sep 26 09:22:32 UTC 2010
On 09/25/2010 11:19 PM, Marco d'Itri wrote:
> On Sep 25, Jonas Meurer <jonas at freesources.org> wrote:
>> the buglog of bug#573073 (filed against cryptsetup) indicates that the
>> lvm2 initscript at boot process finishes before the devices are actually
>> created by udev.
> There is nothing wrong with this.
>> i guess this is a general problem concerning several initscripts which
>> push udev, but it might be able to workaround it by invoking 'udevadm
>> settle' in lvm2 initscript.
> No, it's not like we need to make the boot slower by adding more
> serialization points. The correct solution is to modify cryptsetup to
> install RUN rules and react to the appropriate events.
> e.g. (I do not know it this is correct for this specific case):
> SUBSYSTEM="block", ID_FS_TYPE="crypto_LUKS", RUN+="..."
With the upstream dm rules yo do not need special udev rules.
It is just Debian lvm/device-mapper maintainer who ignores upstream
udev rules and tries to solve it differently.
Please do not use udeavadm settle or any workaround here and try
to use the upstream way.
cryptsetup simply relies on device mapper udev rules when running
with udev support (it synchronizes link creation using these rules
so it cannot happen that you have device but not link in /dev/)
(DM udev rules are provided by lvm/device-mapper package).
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