Hi,
I am seeing that LVM2 is integrated with systemd framework and so accordingly there are many changes in the way how LVM rootfs volume get mounted at boot-up time.
For root LVM volume, LVM create virtual block device "/dev/rhel_host/root". And systemd shows following description of this device.
[root@host vivek]# 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
Description=/dev/rhel_host/root
LoadState=loaded
ActiveState=active
SubState=plugged
InactiveExitTimestamp=Thu 2014-07-24 15:13:50 IST
InactiveExitTimestampMonotonic=17789280
ActiveEnterTimestamp=Thu 2014-07-24 15:13:50 IST
ActiveEnterTimestampMonotonic=17789280
ActiveExitTimestampMonotonic=0
InactiveEnterTimestampMonotonic=0
CanStart=no
CanStop=no
CanReload=no
CanIsolate=no
StopWhenUnneeded=no
RefuseManualStart=no
RefuseManualStop=no
AllowIsolate=no
DefaultDependencies=yes
_OnFailureIsolate_=no
IgnoreOnIsolate=yes
IgnoreOnSnapshot=yes
NeedDaemonReload=no
JobTimeoutUSec=1min 30s
ConditionTimestampMonotonic=0
ConditionResult=no
Transient=no
SysFSPath=/sys/devices/virtual/block/dm-0
I want to know,
1) How systemd and LVM create above dependency of "/dev/rhel_host/root" ? How "/dev/rhel_host/root" gets SysFsPath "/sys/devices/virtual/block/dm-0" ?
2) Which is the udev rule/systemd file creates above dependency (seen by command "systemctl show dev-rhel_host-root.device").
3) How LVM root volume " /dev/rhel_host/root" gets mounted ? Does it handled by LVmetaD ?
Any suggestions/inputs would be welcome.
Thanks and Regards,
Vivek
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