how to recover softraid information?

rippfx · 01-28-2010, 11:26 AM

Hi,

My primary HDD (OS) died and I lost all config related to my softraided array. I replaced the HDD and reinstalled the OS but it can't create a raid volume. It does see the Linux Raid volume but it doesn't assemble it. Here is the output.

Code:

root@snowwolf:~# sfdisk -l

Disk /dev/sda: 91201 cylinders, 255 heads, 63 sectors/track
Units = cylinders of 8225280 bytes, blocks of 1024 bytes, counting from 0

   Device Boot Start     End   #cyls    #blocks   Id  System
/dev/sda1   *      0+  91200   91201- 732572001   fd  Linux raid autodetect
/dev/sda2          0       -       0          0    0  Empty
/dev/sda3          0       -       0          0    0  Empty
/dev/sda4          0       -       0          0    0  Empty

Disk /dev/sdb: 91201 cylinders, 255 heads, 63 sectors/track
Units = cylinders of 8225280 bytes, blocks of 1024 bytes, counting from 0

   Device Boot Start     End   #cyls    #blocks   Id  System
/dev/sdb1          0+  91200   91201- 732572001   fd  Linux raid autodetect
/dev/sdb2          0       -       0          0    0  Empty
/dev/sdb3          0       -       0          0    0  Empty
/dev/sdb4          0       -       0          0    0  Empty

Disk /dev/sdc: 91201 cylinders, 255 heads, 63 sectors/track
Units = cylinders of 8225280 bytes, blocks of 1024 bytes, counting from 0

   Device Boot Start     End   #cyls    #blocks   Id  System
/dev/sdc1          0+  91200   91201- 732572001   fd  Linux raid autodetect
/dev/sdc2          0       -       0          0    0  Empty
/dev/sdc3          0       -       0          0    0  Empty
/dev/sdc4          0       -       0          0    0  Empty

Disk /dev/sdd: 91201 cylinders, 255 heads, 63 sectors/track
Units = cylinders of 8225280 bytes, blocks of 1024 bytes, counting from 0

   Device Boot Start     End   #cyls    #blocks   Id  System
/dev/sdd1   *      0+  91200   91201- 732572001   fd  Linux raid autodetect
/dev/sdd2          0       -       0          0    0  Empty
/dev/sdd3          0       -       0          0    0  Empty
/dev/sdd4          0       -       0          0    0  Empty

Disk /dev/sde: 30401 cylinders, 255 heads, 63 sectors/track
Units = cylinders of 8225280 bytes, blocks of 1024 bytes, counting from 0

   Device Boot Start     End   #cyls    #blocks   Id  System
/dev/sde1   *      0+  29649   29650- 238163593+  83  Linux
/dev/sde2      29650   30400     751    6032407+   5  Extended
/dev/sde3          0       -       0          0    0  Empty
/dev/sde4          0       -       0          0    0  Empty
/dev/sde5      29650+  30400     751-   6032376   82  Linux swap / Solaris

I need to combine sda1 sdb1 sdc1 sdd1 but not too sure where to go from here. Can someone point me to the right direction?

thanks in advance!

jlinkels · 01-29-2010, 09:11 PM

If I understand you well, you did create the RAID array in your newly installed OS, but you cannot make it to assemble?

The reason for this is that there are different UUIDs on the disks (they already were there) and in your new mdadm.conf file.

Did you try use the mdadm assemble command with the --scan option?

Otherwise you might discover the UUIDs on disk and paste them in the mdadm.conf file.

jlinkels