Date: Thu, 20 Jan 2005 02:03:37 +0100 From: Christian Hiris <4711@chello.at> To: freebsd-questions@freebsd.org Subject: Re: gmirror: replacing failed disks Message-ID: <200501200204.10101.4711@chello.at> In-Reply-To: <20050119215303.GC51384@polands.org> References: <20050116201414.GA76014@polands.org> <200501190656.07191.4711@chello.at> <20050119215303.GC51384@polands.org>
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On Wednesday 19 January 2005 22:53, you wrote:
> On Wed, Jan 19, 2005 at 06:55:53AM +0100, Christian Hiris wrote:
[...]
> >
> > 2.2. Blank out gmirror metadata on ad4
> > # dd if=/dev/zero of=/dev/ad4 bs=512 skip=156301400
>
> This command took "a long time" and I didn't let it complete. I use the
> tcsh and would occassionaly hit <ctrl> T to track it's progress. I
> didn't see it writing data to the disk nor did I see disk activity. Did
> I not wait long enough?
Ooops, I just realized that option 'skip=n' skips the blocks on the *input*
file. The correct option to "skip" blocks on the outfile is 'seek=n'. It
didn't damage anything in our case, but it waisted your time. Sorry about
this mistaken option and the time you lost from this. The command's only
purpose is to re-design the drive, as if it hasn't ever faced the gmirror
framework before.
Just for the archives the corrected (and double-checked) command:
2.2. Blank out gmirror metadata on ad4
# dd if=/dev/zero of=/dev/ad4 bs=512 seek=n
where n=(metadata_location_in_bytes/512)-1
[...]
> Christian,
>
> Other than the issue with 2.2 above, the procedure worked and the
> "replacement" drive is now synchronizing. Now I'll print out a
> transcript of this and tape it to the box, Then, in three years, when a
> drive dies, I'll remember what to do :)
>
> Thanks again for all your help.
Just in case, if the tape fails :)
http://freebsd.rambler.ru
It's excellent!
Good luck,
ch
- --
Christian Hiris <4711@chello.at> | OpenPGP KeyID 0x3BCA53BE
OpenPGP-Key at hkp://wwwkeys.eu.pgp.net and http://pgp.mit.edu
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