The software described in this documentation is either in Extended Support or Sustaining Support. See https://www.oracle.com/us/support/library/enterprise-linux-support-policies-069172.pdf for more information.
Oracle recommends that you upgrade the software described by this documentation as soon as possible.
The xfsprogs (3.2.0) user space tool
introduced a new superblock format (v5) that includes a
metadata checksum scheme. While this feature is supported in
UEK R4, it is not currently supported on RHCK. If an
xfs file system is created on a system that
is running UEK R4, where cyclic redundancy checking (CRC) is
enabled, mkfs.xfs generates the v5
superblock automatically and the file system can no longer be
mounted on a system running RHCK. The following error is
returned:
mount: wrong fs type, bad option, bad superblock on /dev/sdb1,
missing codepage or helper program, or other error
In some cases useful info is found in syslog - try
dmesg | tail ..."To check the superblock version number, run the following command:
# sudo xfs_db -r -c "sb" -c p /dev/sdb1 | grep versionnum
This command returns the hexadecimal value of
0xb4a5 for a file system formatted with a
v5 superblock that requires CRC support in the kernel.
Do not try to mount a metadata CRC-enabled XFS file system on RHCK, as it does not support this functionality. (Bug ID 25489518)