md0: unknown partition table - should I worry?

md0: unknown partition table - should I worry?

[Dexter Filmore]

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Today md0 degraded (debian 5.0 i386, raid5, 5x500 samsung sata) so I checked 
the logs and noticed on each rebootI got this in /var/log/messages:

md0: unknown partition table

md0 is all LVM2 and volumes mount fine, so is this normal? 


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Re: md0: unknown partition table - should I worry?

[Robin Hill]

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On Tue Nov 10, 2009 at 11:24:44PM +0100, Dexter Filmore wrote:

> Today md0 degraded (debian 5.0 i386, raid5, 5x500 samsung sata) so I checked 
> the logs and noticed on each rebootI got this in /var/log/messages:
> 
> md0: unknown partition table
> 
> md0 is all LVM2 and volumes mount fine, so is this normal? 
> 
If you're using whole-disk RAID rather than RAID on partitions then this
is normal, yes.  Something (possibly udev, in order to create the
relevant dev entries) is trying to read the partition table and failing
as there isn't one.

Cheers,
    Robin
-- 
     ___        
    ( ' }     |       Robin Hill        <robin@robinhill.me.uk> |
   / / )      | Little Jim says ....                            |
  // !!       |      "He fallen in de water !!"                 |

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Re: md0: unknown partition table - should I worry?

[Doug Ledford]

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On 11/11/2009 04:03 AM, Robin Hill wrote:
> On Tue Nov 10, 2009 at 11:24:44PM +0100, Dexter Filmore wrote:
> 
>> Today md0 degraded (debian 5.0 i386, raid5, 5x500 samsung sata) so I checked 
>> the logs and noticed on each rebootI got this in /var/log/messages:
>>
>> md0: unknown partition table
>>
>> md0 is all LVM2 and volumes mount fine, so is this normal? 
>>
> If you're using whole-disk RAID rather than RAID on partitions then this
> is normal, yes.  Something (possibly udev, in order to create the
> relevant dev entries) is trying to read the partition table and failing
> as there isn't one.

Actually, it doesn't matter if you make your md device out of whole
disks or not, it's the attempt to find a partition table on the md
device itself that is generating this message.  This is a side effect of
the recent kernel change to allow any block device to be partitioned and
merely indicates that no partition table was found on your md device.
It's normal.  In fact, it might be worth suggesting that the message go
away.  If there's no partition table people generally know that because
there are no partitioned dev files ;-)


-- 
Doug Ledford <dledford@redhat.com>
              GPG KeyID: CFBFF194
	      http://people.redhat.com/dledford

Infiniband specific RPMs available at
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