=====Large Partitions=====
====RedHat Way====
Red Hat Enterprise Linux 5.1 and later supports ext3 filesystems up to 16 Terabytes in size. Please see the Red Hat Enterprise Linux 5 Release Notes for further information.

In order to create EXT3 filesystems greater than 2TB, use the normal LVM and mkfs.ext3 commands as follows (assuming the block device for the storage is "/dev/sdd"):

  pvcreate /dev/sdd
  vgcreate BigGroup /dev/sdd
  lvcreate -L 8000G -n bigvol BigGroup
  mkfs.ext3 /dev/BigGroup/bigvol
This example created an 8 TB EXT3 filesystem on /dev/sdd. Since fdisk on the x86 platform is not compatible with partition layouts larger than 2.1TB, it's necessary to use the block devices directly to create physical volumes for LVM.

In order to create filesystems greater than 8 TB, invoke mkfs.ext3 with 4K blocks and the "-F" option:

  pvcreate /dev/sdd
  vgcreate BiggerGroup /dev/sdd
  lvcreate -L 16000G -n biggervol BiggerGroup
  mkfs.ext3 -F -b 4096 /dev/BiggerGroup/biggervol

====Parted Way====
Using Parted

  # parted /dev/sdb
  GNU Parted 2.1
  Using /dev/sdb
  Welcome to GNU Parted! Type 'help' to view a list of commands.

  (parted) print
  Error: /dev/sdb: unrecognised disk label

  (parted) mklabel gpt

  (parted) print
  Model: Unknown (unknown)
  Disk /dev/sdb: 5909GB
  Sector size (logical/physical): 512B/512B
  Partition Table: gpt

  Number  Start  End  Size  File system  Name  Flags
  
Use parted’s mkpart command as shown below to create partition that is greater than 2TB. In this example, we are creating a partition that is roughly of 6TB in size.

  # parted /dev/sdb

  (parted) mkpart primary 0GB 5909GB

  (parted) print
  Model: Unknown (unknown)
  Disk /dev/sdb: 5909GB
  Sector size (logical/physical): 512B/512B
  Partition Table: gpt

  Number  Start   End     Size    File system  Name     Flags
   1      1049kB  5909GB  5909GB               primary
=====Disk Management=====

===Show partitions on a disk===

  fdisk -l
  
===Show LVM information===
  pvs  # shows what partitions are in use as LVMs and to what Volume groups they are assiged
  vgs  # summarized version of volume groups gives Volume groups sizes and used space
  lvs  # summarized list of Logical volumes in a volume group. Shows names, sizes and attributes
  
  pvdisplay # Extended version of pvs, shows much more inforamtion
  vgdisplay # # Extended version of vgs, shows much more inforamtion
  lvdisplay # Extended version of lvs, shows much more inforamtion
 

====Disk Space Checking====

===Find dirs with lots of large files===

[[https://webhostinggeeks.com/howto/find-big-files-size-on-linux/ | this link has a list of commands to help find large files ]]


Finds all directories containing more than 99MB of files, and prints them in human readable format. The directories sizes do not include their subdirectories, so it is very useful for finding any single directory with a lot of large files.

  # du -mS /|grep '^[0-9]\{3,\}'

== list largest directories in a folder 

  # du -h --max-depth=1 /folder | sort -hr

===Find 20 biggest directories on the current filesystem===

  # du -xk | sort -n | tail -20
 
or
 
  # du -a /home | sort -n -r | head -n 20
  
===Find biggest files===

This command will find the biggest files recursively under a certain directory, no matter if there are too many.

  # find . -type f -printf '%20s %p\n' | sort -n | cut -b22- | tr '\n' '\000' | xargs -0 ls -laSr



===Directory Tree Sorted by GB, MB, KB then B===

  # du -b --max-depth 1 | sort -nr | perl -pe 's{([0-9]+)}{sprintf "%.1f%s", $1>=2**30? ($1/2**30, "G"): $1>=2**20? ($1/2**20, "M"): $1>=2**10? ($1/2**10, "K"): ($1, "")}e'

===Getting Disk usage details===

Want disk usage per dir on a Linux? Try:

  # du -h --exclude=/proc --max-depth=1 /