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Description of problem:

The Storage Administration Guide for RHEL 7 mentions that ext4 is the default filesystem in RHEL 6, but does not mention that in RHEL 7 XFS is the default one. 

The text says explicitly:

"ext4 Support
The ext4 file system is fully supported in this release. It is now the default file system of Red Hat Enterprise Linux 6, supporting an unlimited number of subdirectories. ..."

See: 

https://access.redhat.com/site/documentation/en-US/Red_Hat_Enterprise_Linux/7-Beta/html/Storage_Administration_Guide/part-overvw.html#rhel6storage-whatsnew

Ideally, that should be:

"ext4 Support
The ext4 file system is fully supported in this release, supporting an unlimited number of subdirectories. ..."

And we should have an explicit paragraph in the same section (1.1) to introduce XFS, with a link to https://access.redhat.com/site/documentation/en-US/Red_Hat_Enterprise_Linux/7-Beta/html-single/Storage_Administration_Guide/index.html#ch-xfs entitled "The XFS File System".

Actually there is another place where we mention that ext4 is the default in RHEL 7, and it is in chapter 6: The Ext4 File System:

https://access.redhat.com/site/documentation/en-US/Red_Hat_Enterprise_Linux/7-Beta/html-single/Storage_Administration_Guide/index.html#ch-ext4

"The ext4 file system is a scalable extension of the ext3 file system, which was the default file system of Red Hat Enterprise Linux 5. Ext4 is the default file system of Red Hat Enterprise Linux 7, and can support files and file systems larger than 16 terabytes in size, unlike Red Hat Enterprise Linux 6 which only supported up to 16 terabytes."

Ideally it should say:

"The ext4 file system is a scalable extension of the ext3 file system, which was the default file system of Red Hat Enterprise Linux 5. Ext4 can support files and file systems larger than 16 terabytes in size in Red Hat Enterprise Linux 7, unlike Red Hat Enterprise Linux 6 which only supported up to 16 terabytes. "