Re: How to enable my RAID again

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# mdadm -Q /dev/sda
/dev/sda: is not an md array
/dev/sda: No md super block found, not an md component.
# mdadm -Q /dev/sda1
/dev/sda1: is not an md array
/dev/sda1: No md super block found, not an md component.
# mdadm -Q /dev/sda2
/dev/sda2: is not an md array

So it looks like all info is lost. Can I create a new array with the
existing LVM partitions and the free partitions without destroying any data?

Thanks,
Theo
Centos wrote:
> Find out what disk belongs to which md-set and try the --assemble
> option..
>
> This should fix it, I think
>
> Theo Band wrote:
>> Hi
>>
>> I have setup software RAID two years ago using FC3 using the graphical
>> installer (RAID1). In the mean time I installed CENTOS4.5 and everything
>> is running fine. At least that was my perception. It now turns out that
>> raid is not working and that LVS just finds 4 partitions from four disks
>> and that's it.:
>>
>>   /dev/sda2  VolGroup00 lvm2 a-   94.88G     0
>>   /dev/sdb1  VolGroup00 lvm2 a-   94.94G 10.00G
>>   /dev/sdc1  VolGroup00 lvm2 a-   94.94G 74.94G
>>   /dev/sdd1  VolGroup00 lvm2 a-   94.94G 70.81G
>>
>> These are 4 disk of each 200GB, and the disks have these partitions:
>>
>> Using /dev/sda
>> (parted) print
>> Disk geometry for /dev/sda: 0.000-194481.000 megabytes
>> Disk label type: msdos
>> Minor    Start       End     Type      Filesystem  Flags
>> 1          0.031    101.975  primary   ext3        boot
>> 2        101.975  97284.243  primary               lvm
>> 3      97284.243 194474.355  primary               raid
>> Disk geometry for /dev/sdb: 0.000-194481.000 megabytes
>> Disk label type: msdos
>> Minor    Start       End     Type      Filesystem  Flags
>> 1          0.031  97237.177  primary               boot, lvm
>> 2      97237.178 194474.355  primary               raid
>> Disk geometry for /dev/sdc: 0.000-194481.000 megabytes
>> Disk label type: msdos
>> Minor    Start       End     Type      Filesystem  Flags
>> 1          0.031  97237.177  primary               boot, lvm
>> 2      97237.178 194474.355  primary               raid
>> Disk geometry for /dev/sdd: 0.000-194481.000 megabytes
>> Disk label type: msdos
>> Minor    Start       End     Type      Filesystem  Flags
>> 1          0.031  97237.177  primary               boot, lvm
>> 2      97237.178 194474.355  primary               raid
>>
>> So my feeling is that I need to setup the RAID again, but I don't want
>> to make any mistakes here, since this is a live system working fine. I
>> tried to read the mdadm manual but it's not quit clear to me what to do.
>> # mdadm -A --scan -v
>> mdadm: No arrays found in config file
>>
>> Shows I have to do more. The previous fedora installation is still
>> around, but is doesn't contain a /etc/mdadm.conf file.
>>
>> Can anyone help me with some steps to take to get it running again. I do
>> have backups, but if things go wrong restoring takes several hours.
>>
>> Thanks,
>> Theo
>>
>>
>> PS.
>> Send for the third time. Could it be that posting is limited to email
>> addresses that are subscribed to the list?
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