Specifications

Data Replication
Description
Mirror resyncs may hang in early RedHat/CentOS 6.x kernels with a "Failed to remove
device" message in the LifeKeeper log
Kernel versions prior to version 2.6.32-131.17.1 (RHEL 6.1 kernel version 2.6.32-131.0.15 before
update, etc) contain a problem in the md driver used for replication. This problem prevents the
release of the nbd device from the mirror resulting in the logging of multiple "Failed to remove
device" messages and the aborting of the mirror resync. A system reboot may be required to clear
the condition. This problem has been observed during initial resyncs after mirror creation and when
the mirror is under stress.
Solution: Kernel 2.6.32-131.17.1 has been verified to contain the fix for this problem. If you are
using DataKeeper with RedHat or CentOS 6 kernels before the 2.6.32-131.17.1 version, we
recommend updating to this or the latest available version.
DataKeeper: Nested file system create will fail with DataKeeper
When creating a DataKeeper mirror for replicating an existing File System, if a file system is
nested within this structure, the user must unmount it first before creating the File System
resource.
Workaround: Manually unmount the nested file systems and remount / create each nested mount.
SteelEye Protection Suite for Linux233