Need information

[Gk Gk]

Hi,

In our servers with Ubuntu OS, the  '/' file system is mounted on a device
mapper as shown below:
---
# df -h
Filesystem                 Size  Used Avail Use% Mounted on
devtmpfs                   252G     0  252G   0% /dev
tmpfs                      252G     0  252G   0% /dev/shm
tmpfs                      252G   13G  240G   6% /run
/dev/mapper/live-rw         15G   13G  1.8G  88% /
--

Root file system is not mapped to a hard disk. What exactly  is the
'dev/mapper/live-rw' device ? Does it mean that the root file system is in
memory instead on a hard disk ?   Please explain


Thanks
Kumar
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