On Sat, 2019-04-20 at 06:21 +0530, Kaushal Shriyan wrote: > Hi, > > I am running the below command on CentOS Linux release 7.6.1810 (Core) > > # df -hT --total > Filesystem Type Size Used Avail Use% Mounted on > /dev/xvda1 xfs 150G 8.0G 143G 6% / > devtmpfs devtmpfs 7.8G 0 7.8G 0% /dev > tmpfs tmpfs 7.8G 0 7.8G 0% /dev/shm > tmpfs tmpfs 7.8G 817M 7.0G 11% /run > tmpfs tmpfs 7.8G 0 7.8G 0% /sys/fs/cgroup > tmpfs tmpfs 1.6G 0 1.6G 0% /run/user/995 > tmpfs tmpfs 1.6G 0 1.6G 0% /run/user/1000 > total - 185G 8.8G 176G 5% - > # > > Does devtmpfs and tmpfs use underlying hard disk storage or does it uses > Physical Memory (RAM). It uses RAM, that's what 'tmpfs' is, a temporary RAM filesystem. > What is the purpose of devtmpfs which is mounted on > /dev, tmpfs mounted on /dev/shm and so on and so forth. What is the > difference between devtmpfs and tmpfs? devtmpfs is a kernel maintained filesystem of automated device nodes. tmpfs is a RAM disk. > > I will appreciate if anyone can help me understand the above output. Google really is your friend here. P.