https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=237517
Bug ID: 237517
Summary: ZFS parallel mounting sometimes misses mounting
intermediate filesystems
Product: Base System
Version: 12.0-STABLE
Hardware: Any
OS: Any
Status: New
Severity: Affects Some People
Priority: ---
Component: kern
Assignee: b...@freebsd.org
Reporter: trond.endres...@ximalas.info
Both Jim Long and myself experience ZFS parallel mount misses mounting
intermediate filesystems.
As far as I can tell, this behaviour is not deterministic, sometimes the
parallel mounting succeeds and sometimes it doesn't.
See these threads,
https://lists.freebsd.org/pipermail/freebsd-stable/2019-April/090898.html and
https://lists.freebsd.org/pipermail/freebsd-questions/2019-April/284974.html.
Here are a couple of suggestions:
Can we make parallel mounting optional for us that don't need it or want it?
Or, can parallel mounting be changed so that filesystems off the root pool is
completely mounted before all other pools?
This still leaves the possibility of the kernel attempting to mount pool/a/b
before pool/a, even if both filesystems have their canmount properties set to
on, and one being a child of the other.
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