[Bug 223786] Remounting a UFS filesystem read-only takes very long time

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=223786

--- Comment #3 from Kirk McKusick <mckusick at FreeBSD.org> ---
(In reply to Mikhail T. from comment #2)
Being in the biowr state is expected as the filesystem needs to sync out all
the changes. The question is why there are so many of them. Randomly guessing,
perhaps it decides that there are a large number of access times that need to
be written. When upgrading to read-write, include the -o noatime option so
there is no attempt to update access times.

It would also be useful to collect the number of I/O (particularly writes) that
the downgrade command is doing (time -l if your shell does not otherwise
privide the I/O statistics). You can also get an idea of the I/Os being done
using iostat.

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