Re: Brocken Raid & LUKS

Am 23.02.2013 05:36, schrieb Phil Turmel:

On 02/22/2013 10:11 PM, Stone wrote:

quoted

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

quoted

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....

quoted

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.