System information

Ext3 16TB 2TB 32,000 8 Yes Chapter 5,
The Ext3 File
System
Ext4 16TB 16TB
Unlimited
8 Yes Chapter 6,
The Ext4 File
System
XFS 100TB 100TB
Unlimited 8 Yes Chapter 8,
The XFS File
System
File
Syst em
Max
Su p p o rt ed
Siz e
Max File
O f f set
Max
Su b d irect
o ries (per
d irect ory)
Max Dep t h
o f
Symb olic
Lin ks
ACL
Su p p o rt
Det ails
Note: Maximum file and file system sizes
The listed maximum file and file system sizes are what Red Hat has tested and supports. This
does not take into account the theoretical maximum limits.
Both the maximum supported size and maximum file offset columns assume 4k blocks.
11.3. Special Considerat ions
This section enumerates several issues and factors to consider for specific storage configurations.
Separate Partitions for /home, /opt, /usr/local
If it is likely that you will upgrade your system in the future, place /ho me, /o pt, and /usr/l o cal on
a separate device. This will allow you to reformat the devices/file systems containing the operating
system while preserving your user and application data.
DASD and zFCP Devices on IBM System Z
On the IBM System Z platform, DASD and zFCP devices are configured via the Channel Command
Word (CCW) mechanism. CCW paths must be explicitly added to the system and then brought online.
For DASD devices, this is simply means listing the device numbers (or device number ranges) as the
D ASD = parameter at the boot command line or in a CMS configuration file.
For zFCP devices, you must list the device number, logical unit number (LUN), and world wide port name
(WWPN). Once the zFCP device is initialized, it is mapped to a CCW path. The FC P_x= lines on the
boot command line (or in a CMS configuration file) allow you to specify this information for the
installer.
Encrypting Block Devices Using LUKS
[a]
[b ]
[c ]
[a] This maximum file siz e is b ased o n a 6 4-b it mac hine. O n a 32-b it machine, the maximum files siz e
is 8 T B.
[b ] When the link co unt exc eed s 6 5,0 0 0 , it is reset to 1 and no lo ng er inc reases .
[c ] This maximum file s ize is o nly o n 6 4-b it mac hines . Red Hat Enterp rise Linux d o es no t sup p o rt XFS
o n 32-b it mac hines .
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