HowTo Show Mounted Hard Drives Partition

[root@dc4 ~]# df -aTh
Filesystem     Type         Size  Used Avail Use% Mounted on
/dev/md126     ext4         212G  7.9G  194G   4% /
proc           proc            0     0     0    - /proc
sysfs          sysfs           0     0     0    - /sys
devpts         devpts          0     0     0    - /dev/pts
tmpfs          tmpfs        7.8G     0  7.8G   0% /dev/shm
/dev/md127     ext4         453M   87M  343M  21% /boot
/dev/sdc1      ext4         917G   72M  871G   1% /backup
none           binfmt_misc     0     0     0    - /proc/sys/fs/binfmt_misc
[root@dc4 ~]# 

HowTo Check Software Raid Status with Mdstat

[root@dc1 /]# cat /proc/mdstat
Personalities : [raid1] 
md0 : active raid1 sda2[0] sdb2[1]
      204736 blocks super 1.0 [2/2] [UU]
      
md5 : active raid1 sdb8[1] sda8[0]
      901087040 blocks super 1.1 [2/2] [UU]
      [=======>.............]  check = 37.4% (337859904/901087040) finish=132.8min speed=70676K/sec
      bitmap: 3/7 pages [12KB], 65536KB chunk

md4 : active raid1 sdb7[1] sda7[0]
      2096064 blocks super 1.1 [2/2] [UU]
      	resync=DELAYED
      bitmap: 1/1 pages [4KB], 65536KB chunk

md2 : active raid1 sdb1[1] sda1[0]
      20955008 blocks super 1.1 [2/2] [UU]
      	resync=DELAYED
      bitmap: 0/1 pages [0KB], 65536KB chunk

md1 : active raid1 sdb5[1] sda5[0]
      41910144 blocks super 1.1 [2/2] [UU]
      	resync=DELAYED
      bitmap: 1/1 pages [4KB], 65536KB chunk

md3 : active raid1 sdb6[1] sda6[0]
      2096064 blocks super 1.1 [2/2] [UU]
      	resync=DELAYED
      bitmap: 0/1 pages [0KB], 65536KB chunk

unused devices: <none>

HowTo Check Directory Size using DU Command

root@dc2 [~]# du -h /backup
236M	/backup/2013-08-26/accounts
112M	/backup/2013-08-26/system/dirs
96K	/backup/2013-08-26/system/files
112M	/backup/2013-08-26/system
347M	/backup/2013-08-26
24K	/backup/_gsdata_
347M	/backup
root@dc2 [~]# du -sh /backup
347M	/backup
root@dc2 [~]# du -hs * | sort -hr
856M    lib
746M    share
612M    lib64
312M    src
267M    java
239M    bin
179M    sbin
173M    local
93M     i686-w64-mingw32
72M     libexec
26M     include
20M     puppet
772K    X11R6
20K     man
4.0K    games
4.0K    etc
0       tm