Re: AW: skip raid5 reconstruction

Thx.

So it looks like mkraid might do this.

With this hint, I googled the --danferous-no-resync and try to do this

# mdadm --create /dev/md1 --level=5 --assume-clean --raid-
devices=4 /dev/sdf /dev/sdg /dev/sdh /dev/sdi

But then i ran some io and use iostat to find that only 3 devices has io
request and the parity disk has no disk activity at all. so this will be
a skewed data for me.

Ming



On Tue, 2005-07-05 at 19:26 +0200, Lord Hess wrote:

 kkraid -R --dangerous-no-resync /dev/md..

Regards,

Lord

Certon systems GmbH
Hans-Bunte-Str. 8 - 10
69123 Heidelberg
Tel:  +49 6221 549810
Fax: +49 6221 549809
http://www.certon.de
mail to: hess@certon.de
-----Ursprüngliche Nachricht-----
Von: linux-raid-owner@vger.kernel.org
[mailto:linux-raid-owner@vger.kernel.org] Im Auftrag von Ming Zhang
Gesendet: Dienstag, 5. Juli 2005 19:23
An: Linux RAID
Betreff: skip raid5 reconstruction

Hi folks

I am testing some HW performance with raid5 with 2.4.x kenrel.

It is really troublesome every time I create a raid5, wait 4 hours for
reconstruction, and then test some data and then recreate another one
and wait again. I wonder if there is any hack or option available to
create a raid5 without reconstruct the parity disk. I just have interest
to test the performance so do not care about data correctness at this
stage.

Thanks!


Ming




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On Tue, 2005-07-05 at 13:44 -0400, Ming Zhang wrote:

Thx.

So it looks like mkraid might do this.

I tried mkraid and it works. 

Thanks a lot!

Ming

With this hint, I googled the --danferous-no-resync and try to do this

# mdadm --create /dev/md1 --level=5 --assume-clean --raid-
devices=4 /dev/sdf /dev/sdg /dev/sdh /dev/sdi

But then i ran some io and use iostat to find that only 3 devices has io
request and the parity disk has no disk activity at all. so this will be
a skewed data for me.

Ming



On Tue, 2005-07-05 at 19:26 +0200, Lord Hess wrote:

quoted

 kkraid -R --dangerous-no-resync /dev/md..

Regards,

Lord

Certon systems GmbH
Hans-Bunte-Str. 8 - 10
69123 Heidelberg
Tel:  +49 6221 549810
Fax: +49 6221 549809
http://www.certon.de
mail to: hess@certon.de
-----Ursprüngliche Nachricht-----
Von: linux-raid-owner@vger.kernel.org
[mailto:linux-raid-owner@vger.kernel.org] Im Auftrag von Ming Zhang
Gesendet: Dienstag, 5. Juli 2005 19:23
An: Linux RAID
Betreff: skip raid5 reconstruction

Hi folks

I am testing some HW performance with raid5 with 2.4.x kenrel.

It is really troublesome every time I create a raid5, wait 4 hours for
reconstruction, and then test some data and then recreate another one
and wait again. I wonder if there is any hack or option available to
create a raid5 without reconstruct the parity disk. I just have interest
to test the performance so do not care about data correctness at this
stage.

Thanks!


Ming




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To unsubscribe from this list: send the line "unsubscribe linux-raid" in
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