On Thu, Dec 30, 2010 at 4:16 PM, Mathias BurÃn <mathias.buren@xxxxxxxxx> wrote:
> On 31 December 2010 00:14, Mark Knecht <markknecht@xxxxxxxxx> wrote:
>> On Thu, Dec 30, 2010 at 4:12 PM, Mathias BurÃn <mathias.buren@xxxxxxxxx> wrote:
>>> On 31 December 2010 00:10, Mark Knecht <markknecht@xxxxxxxxx> wrote:
>>>> Hi,
>>>> Â What am I forgetting to do? I had a RAID1 using sd{a,b,c}3. I
>>>> stopped md3, removed the md3 line in /etc/mdadm.conf, deleted the
>>>> partitions using fdisk, and then created 5 new partitions using
>>>> sd{a,b,c,d,e}3 to get ready to do a 5 disk RAID6. The new partitions
>>>> are the same size as the old ones and located at the same sector
>>>> addresses.
>>>>
>>>> Â After rebooting, but before creating the new RAID6, I still see md3:
>>>>
>>>> mark@c2stable ~ $ cat /proc/mdstat
>>>> Personalities : [linear] [raid0] [raid1] [raid10] [raid6] [raid5] [raid4]
>>>> md6 : active raid1 sdb6[1] sdc6[2] sda6[0]
>>>> Â Â Â247416933 blocks super 1.1 [3/3] [UUU]
>>>>
>>>> md3 : active raid1 sdc3[2] sdb3[1] sda3[0]
>>>> Â Â Â52436096 blocks [3/3] [UUU]
>>>>
>>>> md5 : active raid1 sdc5[2] sdb5[1] sda5[0]
>>>> Â Â Â52436032 blocks [3/3] [UUU]
>>>>
>>>> unused devices: <none>
>>>> mark@c2stable ~ $
>>>>
>>>>
>>>> Â What am I doing wrong or forgetting? I would like md3 to be totally
>>>> gone before I create a new md3 in it's place.
>>>>
>>>> Thanks,
>>>> Mark
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>>>
>>> Erase the superblocks? Recreating partitions doesn't (usually) affect
>>> the data on the HDDs.
>>>
>>> // M
>>>
>>
>> Is erasing the superblocks a mdadm operation? I've not heard of that one before.
>>
>> Thanks,
>> Mark
>>
>
> Yes, see mdadm --misc. Like:
>
> mdadm --zero-superblock <device>
>
> // M
>
Yes, just found that.
Can I still use /dev/md3 safely even though it's no longer in
mdadm.conf? I suspect I can?
Cheers,
Mark
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