[linux-lvm] How LVM root volumes gets mounted at boot time ?

[Vivek Satpute]

Thanks a much Peter. This really helped a lot :-)


Regards


On Fri, Aug 8, 2014 at 12:04 PM, Peter Rajnoha <prajnoha at redhat.com> wrote:

> On 08/07/2014 08:20 PM, Vivek Satpute wrote:
> > Thanks a lot Peter for replying.
> >
> > I know that */sys/devices/virtual**/block/dm-0  *SysFsPath would get
> > created by block-layer when corresponding block device gets created.
> >
> > Actually I am looking for how below dependencies is getting created for
> > LVM volume by systemd:
> >
> > [root at host]# systemctl show dev-rhel_host-root.device
> > Id=dev-rhel_host-root.device
> > Names=dev-rhel_host-root.device
> > *Following=sys-devices-virtual-block-dm\x2d0.device
> > *
> > [...]
> > *SysFSPath=/sys/devices/virtual/block/dm-0*
> > *
> > *
> > /dev/rhel_host/root (path of LVM volume) is actually a symbolic link
> > pointing to /dev/dm-0, then how systemd recognize that
> > device dev-rhel_host-root.device
> > follows *sys-devices-virtual-block-dm\x2d0.device ?*
> > *
>
> Systemd can read this information from udev events (or udev database
> records).
> The information about all existing symlinks and their names, the dev node
> name
> ("kernel name") and related sysfs link is all recorded in udev database so
> systemd
> just makes the .device unit out of this information.
>
> --
> Peter
>
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