Creating RAID1 with "missing" - mdadm 1.90

Creating RAID1 with "missing" - mdadm 1.90

[berk walker]

What might the proper [or functional] syntax be to do this?

I'm running 2.6.10-1.766-FC3, and mdadm 1.90.

Thanks for the time.
b-

Re: Creating RAID1 with "missing" - mdadm 1.90

[Neil Brown]

On Saturday March 5, berk@panix.com wrote:
> What might the proper [or functional] syntax be to do this?
> 
> I'm running 2.6.10-1.766-FC3, and mdadm 1.90.

It would help if you told us what you tried as then we could possible
give a more focussed answer, however:


   mdadm --create /dev/md1 --level=raid1 --raid-devices=2 /dev/sda3 missing

might be the sort of thing you want.

NeilBrown

> 
> Thanks for the time.
> b-
> -
> To unsubscribe from this list: send the line "unsubscribe linux-raid" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html

Re: Creating RAID1 with "missing" - mdadm 1.90

[Peter T. Breuer]

berk walker <berk@panix.com> wrote:
> What might the proper [or functional] syntax be to do this?
> 
> I'm running 2.6.10-1.766-FC3, and mdadm 1.90.

Substitute the word "missing"  for the corresponding device in the
mdadm create command.

(quotes manual page)

    To create a "degraded" array in which some devices are missing,
    simply give the word "missing" in place of a device name.

Peter

Re: Creating RAID1 with "missing" - mdadm 1.90

[Dirk Jagdmann]

I have successfully set up a raid1 in degraded mode with this command line:

mdadm --create /dev/md0 --level=1 --raid-devices=2 missing /dev/hda2

I have experienced problems when the "missing" drive was the second
and the array would not initialize correctly when a real disk was
added later. When "missing" is the first I did not have any problems.
(Those problems were with linux 2.4 kernels, maybe this is solved with
2.6, but I did had the opportunity to check yet)

-- 
---> Dirk Jagdmann
----> http://cubic.org/~doj
-----> http://llg.cubic.org