On 3/17/07, Jonathan McKeown <[EMAIL PROTECTED]> wrote:
On Friday 16 March 2007 21:48, Steve Franks wrote:
> On 3/16/07, John Nielsen <[EMAIL PROTECTED]> wrote:
> > On Friday 16 March 2007 11:18, Steve Franks wrote:
> > > I get the following:
> > >
> > > #gmirror label -v -b split -s 1024 data ad0
> > > can't store metadata on ad0: operation not permitted.
> >
> > That most likely means that you currently have a filesystem on ad0
> > mounted. If that's the case you should be glad that the OS was smarter
> > than you. What steps had you taken prior to this?
>
> It appears to say in the manpage that you can do this on a disk with
> an existing filesys - would you expect it to work if the disk is
> unmounted first, then?
The way to do this is potentially a little risky but I haven't had a problem
with it yet after setting up several mirrors on live fileservers. There is a
sysctl called kern.geom.debugflags: if you set this to 16 it will allow you
to change the mounted filesystem. Bear in mind that since the metadata for
the mirror is written to the last sector of the disk, there is a small risk
of data loss: if that sector contains data it will be overwritten.
There's a thorough howto by Ralph Engelschall, and an OnLamp article by Dru
Lavigne, with more details:
http://people.freebsd.org/~rse/mirror/
http://www.onlamp.com/pub/a/bsd/2005/11/10/FreeBSD_Basics.html
Jonathan
Yes, the origonal disk was pretty full, but, I suspect this is not a good thing:
Filesystem 1K-blocks Used Avail Capacity Mounted on
/dev/ad0s1a 507630 95254 371766 20% /
devfs 1 1 0 100% /dev
/dev/ad0s1e 507630 30688 436332 7% /tmp
/dev/ad0s1f 152451398 5956408 134298880 4% /usr
/dev/ad0s1d 1444526 103600 1225364 8% /var
/dev/mirror/rainstones1 151368706 141135278 -1876068 101% /rainstone
How is that even possible?
Steve
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