Re: XFS and multiple mounts protection (aka preventing multiple mounts)

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On 08/05/2017 15:26, Eric Sandeen wrote:
It also delays each mount by that amount of time, which
may not be desirable in a production environment.

True. With the default mmp interval (5 sec), during my testing I saw >15 secs delay mounting the filesystem.

I'm sure it depends on what happens during that mount.  Damage could
range from none to minimal to catastrophic.  If you've escaped without
corruption, it's partly luck.  If the 2nd node did no IO, and unmounted
quickly, you'd get an unmount record written to the log which, depending
on the location, may or may not matter if a subsequent log replay was
required, for example.

-Eric


Very interesting. Thank you so much.

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