On Wed, Mar 03, 2004 at 10:07:17PM +0000, Nik Clayton wrote: > Toward the end of last year, through to earlier this year, -current had > a problem with vnode backed md(4) devices. Specifically, > > truncate -s 6G foo.md > mdconfig -a -t vnode -f foo.md -u 0 > newfs /dev/md0 > mount /dev/md0 /mnt > rsync /large/amount/of/data /mnt > > would cause the rsync process to eventually get stuck in a wdrain > state, and other processes in the system would gradually hang -- > processes were still running, but doing anything that might need to > read from a buffer caused the process to hang. Eventually, everything > would be hung. > > If I'm reading the mailing lists right, this was supposed to be solved > here: > > http://lists.freebsd.org/pipermail/freebsd-current/2003-November/ > 013183.html > > However, I'm still seeing the problem in -current from Jan 14th. So > I'm wondering if anyone else is seeing it, and if not, a rough idea of > when it was fixed. Following some off-list suggestions, I can report that mount -o sync /dev/md0 /mnt solves the "copying large amounts of data will hang" problem. However, it replaces it with an "unmounting the md0 device hangs" problem. N -- FreeBSD: The Power to Serve http://www.freebsd.org/ (__) FreeBSD Documentation Project http://www.freebsd.org/docproj/ \\\'',) \/ \ ^ --- 15B8 3FFC DDB4 34B0 AA5F 94B7 93A8 0764 2C37 E375 --- .\._/_)
This archive was generated by hypermail 2.4.0 : Wed May 19 2021 - 11:37:46 UTC