Array will not assemble

Array will not assemble

[Richard Scobie]

Perhaps I am misunderstanding how assemble works, but I have created a 
new RAID 1 array on a pair of SCSI drives and am having difficulty 
re-assembling it after a reboot.

The relevent mdadm.conf entry looks like this:


ARRAY /dev/md3 level=raid1 num-devices=2 
UUID=72189255:acddbac3:316abdb0:9152808d devices=/dev/sdc,/dev/sdd

The above is all one line.

If I run "mdadm -As", I get the error:

mdadm: no devices found for /dev/md3.

If I then run:

mdadm --assemble /dev/md3 /dev/sdc /dev/sdd

it all starts up fine.

Thanks,

Richard

Re: Array will not assemble

[Neil Brown]

On Friday July 7, richard@sauce.co.nz wrote:
> Perhaps I am misunderstanding how assemble works, but I have created a 
> new RAID 1 array on a pair of SCSI drives and am having difficulty 
> re-assembling it after a reboot.
> 
> The relevent mdadm.conf entry looks like this:
> 
> 
> ARRAY /dev/md3 level=raid1 num-devices=2 
> UUID=72189255:acddbac3:316abdb0:9152808d devices=/dev/sdc,/dev/sdd

Add
  DEVICE /dev/sd?
or similar on a separate line.
Remove
  devices=/dev/sdc,/dev/sdd

NeilBrown

Re: Array will not assemble

[Richard Scobie]

Neil Brown wrote:

> Add
>   DEVICE /dev/sd?
> or similar on a separate line.
> Remove
>   devices=/dev/sdc,/dev/sdd

Thanks.

My mistake, I thought after having assembled the arrays initially, that 
the output of:

  mdadm --detail --scan > mdadm.conf

could be used directly.

I'm using Centos 4.3, which I believe is the latest RHEL 4 and they are 
only on mdadm 1.6  :(

Regards,

Richard

Re: Array will not assemble

[Bill Davidsen]

Richard Scobie wrote:

> Neil Brown wrote:
>
>> Add
>>   DEVICE /dev/sd?
>> or similar on a separate line.
>> Remove
>>   devices=/dev/sdc,/dev/sdd
>
>
> Thanks.
>
> My mistake, I thought after having assembled the arrays initially, 
> that the output of:
>
>  mdadm --detail --scan > mdadm.conf
>
> could be used directly.
>
> I'm using Centos 4.3, which I believe is the latest RHEL 4 and they 
> are only on mdadm 1.6  :( 


Do understand that the whole purpose of RHEL is to have a stable system. 
Upgrades are not done, instead bugs are fixed in the original version to 
correct security or stability issues. However, feature changes are not 
provided, because ver versions mean new issues. Stability has its price.

-- 
bill davidsen <davidsen@tmr.com>
  CTO TMR Associates, Inc
  Doing interesting things with small computers since 1979