On 2012/07/16 07:45, Dave Chinner wrote:
On Fri, Jul 13, 2012 at 03:54:54PM +0200, Jan Kara wrote:
On Thu 12-07-12 18:10:14, Fernando Luis Vázquez Cao wrote:
The FIISFROZEN ioctl can be use by HA and monitoring software to check
the freeze state of a mounted filesystem.
Can you explain in more detail why the HA system needs to check this?
And, for that matter, what it does with that information?
What our HA guys told me is that certain fencing scripts
try to umount filesystems that can be in frozen state. The
problem is that when we umount a frozen filesystem the
superblock still stays around which can lead to a split-brain
scenario.
Thanks,
Fernando
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