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

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-----Original Message-----
From: centos-bounces@xxxxxxxxxx [mailto:centos-bounces@xxxxxxxxxx] On Behalf
Of Scott Silva
Sent: Thursday, October 05, 2006 11:15 PM
To: centos@xxxxxxxxxx
Subject: [CentOS] Re: Cannot re-make a software raid pair

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.

-- 

Hi Scott,

Disks are 100% identical - right down to the last cylinder...hda is the live
disk and hdg is the new one...

[root@petdoctors ~]# sfdisk --no-reread /dev/hda

Disk /dev/hda: 24321 cylinders, 255 heads, 63 sectors/track
Old situation:
Units = cylinders of 8225280 bytes, blocks of 1024 bytes, counting from 0

   Device Boot Start     End   #cyls    #blocks   Id  System
/dev/hda1   *      0+     12      13-    104391   fd  Linux raid autodetect
/dev/hda2         13     273     261    2096482+  82  Linux swap
/dev/hda3        274   24320   24047  193157527+  fd  Linux raid autodetect
/dev/hda4          0       -       0          0    0  Empty
Input in the following format; absent fields get a default value.
<start> <size> <type [E,S,L,X,hex]> <bootable [-,*]> <c,h,s> <c,h,s>
Usually you only need to specify <start> and <size> (and perhaps <type>).

/dev/hda1 :
[root@petdoctors ~]# sfdisk /dev/hdg            
Checking that no-one is using this disk right now ...
OK

Disk /dev/hdg: 24321 cylinders, 255 heads, 63 sectors/track
Old situation:
Units = cylinders of 8225280 bytes, blocks of 1024 bytes, counting from 0

   Device Boot Start     End   #cyls    #blocks   Id  System
/dev/hdg1          0+     12      13-    104391   fd  Linux raid autodetect
/dev/hdg2         13     273     261    2096482+  82  Linux swap
/dev/hdg3        274   24320   24047  193157527+  fd  Linux raid autodetect
/dev/hdg4          0       -       0          0    0  Empty
Input in the following format; absent fields get a default value.
<start> <size> <type [E,S,L,X,hex]> <bootable [-,*]> <c,h,s> <c,h,s>
Usually you only need to specify <start> and <size> (and perhaps <type>).

/dev/hdg1 :

[root@petdoctors ~]# mdadm /dev/md1 -a /dev/hdg3
mdadm: hot add failed for /dev/hdg3: Invalid argument
[root@petdoctors ~]# 


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