RAID disk failure

[Reindl Harald]

Am 18.12.2011 18:51, schrieb Sam Varshavchik:
> Carefully review the existing partition layout on what I presume is your good disk, /dev/sdb, and compare it with
> your recreated partition table on /dev/sda.
> 
> Hopefully, on /dev/sdb, your first partition starts on sector 2048, and not sector 63. You probably partitioned
> your new /dev/sda with the first partition starting on sector 63, which does not leave enough room to install grub.
> You'll have to start over. Fail and drop all your sda partitions on of all your md arrays. Create a new partition
> table on sda, recreating the partitions exactly how they are on sdb, starting with sector 2048, matching the start
> and the end of each partition, on sda, exactly how they exist on sdb. Then you'll be able to install grub.

normally "dd if=/dev/good-disk of=/dev/replaced-disk bs=512 count=1"
does this job wonderful because you have a 100% clone of the whole MBR
and partition table, yes i have done this serval times on a disk layout
with RAID1 for /boot, RAID10 for / and RAID10 for /mnt/data

[root at srv-rhsoft:~]$ fdisk -l /dev/sda
Disk /dev/sda: 2000.4 GB, 2000398934016 bytes
255 Köpfe, 63 Sektoren/Spur, 243201 Zylinder, zusammen 3907029168 Sektoren
Einheiten = Sektoren von 1 × 512 = 512 Bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x0000ae2c

   Gerät  boot.     Anfang        Ende     Blöcke   Id  System
/dev/sda1   *        2048     1026047      512000   fd  Linux raid autodetect
/dev/sda2         1026048    31746047    15360000   fd  Linux raid autodetect
/dev/sda3        31746048  3906971647  1937612800   fd  Linux raid autodetect

Personalities : [raid1] [raid10]
md2 : active raid10 sdc3[0] sdd3[3] sda3[4] sdb3[5]
      3875222528 blocks super 1.1 512K chunks 2 near-copies [4/4] [UUUU]
      bitmap: 6/29 pages [24KB], 65536KB chunk
md1 : active raid10 sdc2[0] sdd2[3] sda2[4] sdb2[5]
      30716928 blocks super 1.1 512K chunks 2 near-copies [4/4] [UUUU]
      bitmap: 1/1 pages [4KB], 65536KB chunk
md0 : active raid1 sdc1[0] sdd1[3] sda1[4] sdb1[5]
      511988 blocks super 1.0 [4/4] [UUUU]


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