Re: Brocken Raid & LUKS

[Stone <stone@heisl.org>]

Am 23.02.2013 05:36, schrieb Phil Turmel:
> On 02/22/2013 10:11 PM, Stone wrote:
>
>> no i have no idea why die partion table is wrong on /dev/sdc.
>> i can copy with dd the partion table from sdb to sdc...
>> example:
>> dd if=/dev/sdb of=sdb.part bs=512 count=1
>> dd if=sdb.part of=/dev/sdc bs=512 count=1
> That won't work for gpt.
> http://en.wikipedia.org/wiki/GUID_Partition_Table
>
>> infos:
>> root@ubuntu:~/raid# parted /dev/sdb print
>> Model: ATA WDC WD20EARS-00M (scsi)
>> Disk /dev/sdb: 2000GB
>> Sector size (logical/physical): 512B/512B
>> Partition Table: gpt
>>
>> Number  Start   End     Size    File system  Name  Flags
>>   1      17,4kB  2000GB  2000GB                     raid
> Uh oh.  Sector 34.  That start point is very bad for performance.
i dont know why the partion is so....
>
>> root@ubuntu:~/raid# parted /dev/sdc print
>> Model: ATA WDC WD20EARS-00M (scsi)
>> Disk /dev/sdc: 2000GB
>> Sector size (logical/physical): 512B/512B
>> Partition Table: gpt
>>
>> Number  Start   End     Size    File system  Name  Flags
>>   1      1049kB  2000GB  2000GB
> This one is aligned for proper performance, but it appears to be the
> wrong alignment for getting your data back.  Yuck.
>
> Once you fix this partition table to get your data, take a backup of the
> array.  Then make a new array with partitions starting at sector 2048.
> Or no partitions at all.
>
> Phil
ok befor i doing something worg i will ask you more questions :)
what do you mean with "take a backup of the array" and how it works? 
sorry i dont know what you mean
after this i create on all four devices the partiontable new with parted 
and the starting sector must be 2048.
should i make a backup copy of all devices partiontables? if yes how?

thx.