[CentOS] Re: Cannot re-make a software raid pair

Scott Silva ssilva at sgvwater.com
Thu Oct 5 22:14:35 UTC 2006

Nigel Kendrick spake the following on 10/5/2006 12:45 PM:
> Apologies if you get this twice - the first one didn't seem to make it... 
> Hi Guys,
> I have just replaced a faulty Max...woah, wait...this one's a Seagate... IDE
> hard disk but I cannot remake the software raid pair.
> The currently running disk is hda and I am trying to add back hdg - both are
> master drives on separate controllers.
> I have run fdisk on hdg and created the same partition structure as had and
> changed their types to 'fd' but when I try and rebuild the array I get:
> mdadm /dev/md0 -a /dev/hdg1
> mdadm: hot add failed for /dev/hdg1: Invalid argument
> If I look at /var/log/messages, I have:
> Oct  5 16:04:39 petdoctors kernel: md: could not bd_claim hdg1.
> Oct  5 16:04:39 petdoctors kernel: md: error, md_import_device() returned
> -16
>>From other postings, this seems to imply the hdg1 partition is mounted but I
> can find no evidence of this (df or cat /proc/mounts or lsof). I have done
> sone googling and found others having fun with this but no specific
> solution.
> Anyone?
Maybe the table didn't get re-read after fdisk was done. I usually use sfdisk
just because I can copy a partition table without making my usual fat-fingered
typos. Are you sure that the new drive isn't smaller than the old? Even by a
few cylinders.


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