Hello!
I have a nasty problem with a file-backed md. The file is the
Windows' swap file residing on a msdosfs part of the drive.
First I tried to just swapon to the md:
tmp=`mdconfig -a -t vnode -f /W/pagefile.sys`
swapon $tmp
But random big-memory programs were hanging. At that stage,
even the simple sync(8) was hanging and reboot would report
that "some processes would not die".
So I switched to using that chunk of disk as:
newfs /dev/$tmp
mount /dev/$tmp /scratch
This seems to work initially -- the file system is created at
boot. I was able to untar a sizable tarball onto it. I opened
a file under /scratch in vi and was able to browse it, but on
trying to :q, the editor hung and is still hung as I type this.
An attempt to `umount /scratch' is currently hung as:
MWCHAN STAT
`wdrain D'
while a subsequent forcefull `umount -f /scratch' looks slightly
different:
MWCHAN STAT
`devfs D'
Attempt to delete the md fails with EBUSY.
A big program (kmail) is now hung too, although it is not supposed to
look at /scratch:
MWCHAN STAT
`wdrain D'
-- I'm afraid all disk-access is now busted and I'm able to type this
only because with my 1Gb or RAM most of the stuff is entirely in cache.
The -current kernel is built from Mar 6 sources, but I first observed
the problem with an earlier kernel -- a few weeks before.
Any hope? Thanks!
-mi
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