[Bug 199775] ZFS hangs while removing large file

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=199775

            Bug ID: 199775
           Summary: ZFS hangs while removing large file
           Product: Base System
           Version: 10.1-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: danmer at danmer.net

I have two servers FreeBSD 10.1-RELEASE and 10.1-STABLE. There are some zfs
pools on it with raidz2 and raidz3. I have the same problem on them. When I was
removing 1.3 TB file from zfs system hangs after 20-30 minutes. There was no
one error in console, but I was forced to reset server. After boot I waited
30-90 minutes before system was able to mount zfs datasets. At that time HDD of
pool was blinking. After that file has disappeared and system works well. The
same hangs appeared when I destroy dataset with large file.

This behavior repeated on files bigger 1TB on both servers. What is the
problem? Thanks for any help!

There is discussion on FreeBsd forums:
https://forums.freebsd.org/threads/zfs-hangs-while-removing-large-file.51054

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