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Re:The State of ZFS on Linux by lmz on Thursday September 11, 2014 @11:04PM (#8306412)
RHEL6 uses ext4 as default[1] filesystem. It certainly does support ext4 as root.

[1]: https://access.redhat.com/documentation/en-US/Red_Hat_Enterp...

Re:The State of ZFS on Linux by DiabloD3 on Friday September 12, 2014 @08:47AM (#8307700)
Weird, I had to install RHEL6 for a customer, and it defaulted to ext3 and ext4 was not selectable.