[CentOS] Software Raid Expert Needed

Iulian Badea iulian at badea.biz
Sun Oct 5 22:24:04 UTC 2008


My solution, please tell me if I'm right:

-remove the entire sdb disk from raid
-remove sda2 from raid
-resize sda1 (the rest of disk)
-copy partition table from sda to sdb
-make raid between sda1/sdb1 and sda3 and sdb3

Is this possible?

On Sun, 05 Oct 2008 15:15:40 -0700, John R Pierce <pierce at hogranch.com>
wrote:
> Iulian Badea wrote:
>> Hello all,
>>
>> I have 2 x 250GB sata disks (sda and sdb).
>>
>> # fdisk -l /dev/sda
>>
>> Disk /dev/sda: 250.0 GB, 250059350016 bytes
>> 255 heads, 63 sectors/track, 30401 cylinders
>> Units = cylinders of 16065 * 512 = 8225280 bytes
>>
>>    Device Boot      Start         End      Blocks   Id  System
>> /dev/sda1   *           1       14939   119997486   fd  Linux raid
>> autodetect
>> /dev/sda2           14940       29878   119997517+  fd  Linux raid
>> autodetect
>> /dev/sda3           29879       30400     4192965   fd  Linux raid
>> autodetect
>>
>> # fdisk -l /dev/sdb
>>
>> Disk /dev/sdb: 250.0 GB, 250059350016 bytes
>> 255 heads, 63 sectors/track, 30401 cylinders
>> Units = cylinders of 16065 * 512 = 8225280 bytes
>>
>>    Device Boot      Start         End      Blocks   Id  System
>> /dev/sdb1   *           1         522     4192933+  fd  Linux raid
>> autodetect
>>
>> # cat /proc/mdstat
>> Personalities : [raid1]
>> md2 : active raid1 sdb1[1] sda3[0]
>>       4192832 blocks [2/2] [UU]
>>
>> md1 : active raid1 sda2[1] sda1[0]
>>       119997376 blocks [2/2] [UU]
>>
>> What I want to do:
>> - have on each disk 2 partitions (4gb for swap and the 200gb+ the rest
> for
>> /)
>> - raid 1 between them
>>
>> This is what I wanted in the beginning, but...I didn't paid attention...
>>
>> What can I do to rebuild it to my needs (without loosing data or
>> reformatting)?
>>
> 
> ouch.
> 
> I'd boot a rescue CD, drop the mirrors, repartition and mkfs on sdb1,
> dump both file systems to it, drop both metadisks, repartition sda1 as 2
> x raid1 w/o any active mirrors, mkfs on them, restore the dumps to these
> new md0, md1, then repartition sdb again as the two mirrors and join
> them to md0, md1
> 
> but thats just me.  others might do it differently.
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