https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=255261
Bug ID: 255261
Summary: Slow unmount of (ZFS) filesystem at reboot time
Product: Base System
Version: 12.2-RELEASE
Hardware: Any
OS: Any
Status: New
Severity: Affects Some People
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
Created attachment 224295
--> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=224295&action=edit
Patch to add a progress indicator for filesystem unmounting at reboot/shutdown
On a server with about 140000 zfs filesystems a "reboot" sometimes takes a very
long (hours) time. Time that is spend by the kernel unmounting the filesystems.
Unfortunately the kernel doesn't print any kind of progress indication when
this occurs so you just see the "Uptime: xxxx" printed and then nothing...
Please find enclosed a patch that adds a progress indication for the unmounting
part.
(There used to be a related issue with the ZFS kmem freeing also taking a very
long time but that fix is included so that part goes quickly when the
unmounting part has been passed).
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