Need information
Robert Heller
heller at deepsoft.com
Thu Aug 24 14:30:56 UTC 2023
At Thu, 24 Aug 2023 19:09:03 +0530 "Ubuntu user technical support,? not for general discussions" <ubuntu-users at lists.ubuntu.com> wrote:
>
> 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
What do you mean by "servers"? Are these VPS in the cloud somewhere?
There are any number of possibilities -- we need much more info to answer your
question. *One* possibility is LVM. *I* use LVM on some of my machines:
sauron% df -h
Filesystem Size Used Avail Use% Mounted on
tmpfs 769M 2.2M 767M 1% /run
/dev/mapper/sauron-ubuntu_root 50G 42G 5.1G 90% /
tmpfs 3.8G 32K 3.8G 1% /dev/shm
tmpfs 5.0M 8.0K 5.0M 1% /run/lock
tmpfs 3.8G 0 3.8G 0% /run/qemu
/dev/mapper/sauron-www 9.8G 1.2G 8.1G 13% /var/www
/dev/mapper/sauron-distrocds 79G 68G 7.2G 91% /distrocds
/dev/mapper/sauron-wine 261M 172M 75M 70% /wineC
/dev/mapper/sauron-Stuff 21G 17G 3.6G 83% /Stuff
/dev/mapper/sauron-dvdisos 44G 41G 1.1G 98% /dvdisos
/dev/mapper/sauron-SourceManagementC5 942M 303M 588M 34% /home3/heller/Deepwoods
/dev/md126 948M 416M 483M 47% /boot
/dev/mapper/sauron-extra 50G 31G 16G 67% /extra
/dev/mapper/sauron-localrepo 868M 1.3M 815M 1% /var/www/localrepo
/dev/mapper/sauron-home 70G 60G 7.4G 89% /home
/dev/mapper/sauron-pipinbackup 246G 107G 127G 46% /PipinBackup
gollumm1% df -h
Filesystem Size Used Avail Use% Mounted on
udev 1.9G 0 1.9G 0% /dev
tmpfs 374M 25M 350M 7% /run
/dev/mapper/Gollum_m1-m1_root 30G 7.2G 21G 26% /
tmpfs 1.9G 0 1.9G 0% /dev/shm
tmpfs 5.0M 4.0K 5.0M 1% /run/lock
tmpfs 1.9G 0 1.9G 0% /sys/fs/cgroup
/dev/nvme0n1p1 920M 27M 830M 4% /boot
/dev/mapper/Gollum_m1-mp3s 20G 17G 2.6G 87% /mp3s
/dev/mapper/Gollum_m1-scratch 40G 37G 1022M 98% /scratch
/dev/mapper/Gollum_m1-home 37G 17G 18G 49% /home
(LVM is a convientient way of managing disk space with large storage media.)
>
>
> Thanks
> Kumar
>
--
Robert Heller -- Cell: 413-658-7953 GV: 978-633-5364
Deepwoods Software -- Custom Software Services
http://www.deepsoft.com/ -- Linux Administration Services
heller at deepsoft.com -- Webhosting Services
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