Question on MBR of SATA Raid 1 Software

[Dario Lesca]

I have install my fc6 server with RAID-1 software on 2 SATA HD.
All work fine.

My question is:

If HD1 crash, HD2 is ready for boot the system? I have see witch the MBR
of the 2 disk is different. (see follow explanation)...

I must copy with this command:

  # dd bs=512 count=1 if=/dev/sda of=/dev/sdb

MBR of first disk on MBR of second disk?

Or this operation is not necessary?

Many thanks!

> [root at s-scarwall ~]# dd bs=512 count=1 if=/dev/sda of=/tmp/sda 
> 1+0 records in
> 1+0 records out
> 512 bytes (512 B) copied, 0,0119784 seconds, 42,7 kB/s
> [root at s-scarwall ~]# dd bs=512 count=1 if=/dev/sdb of=/tmp/sdb
> 1+0 records in
> 1+0 records out
> 512 bytes (512 B) copied, 0,0175179 seconds, 29,2 kB/s
> [root at s-scarwall ~]# diff /tmp/sd?
> Binary files /tmp/sda and /tmp/sdb differ
> [root at s-scarwall ~]# hexdump -C /tmp/sda>/tmp/sda.txt
> [root at s-scarwall ~]# hexdump -C /tmp/sdb>/tmp/sdb.txt
> [root at s-scarwall ~]# diff /tmp/sd?.txt
> 5c5
> < 00000040  80 00 00 80 41 24 02 00  00 08 fa 90 90 f6 c2 80  |....A$..........|
> ---
> > 00000040  81 00 00 80 41 24 02 00  00 08 fa 90 90 f6 c2 80  |....A$..........|
> 28c28
> < 000001b0  00 00 00 00 00 00 00 00  21 d0 00 00 00 00 80 01  |........!.......|
> ---
> > 000001b0  00 00 00 00 00 00 00 00  bf 7e 08 00 00 00 80 01  |.........~......|
> [root at s-scarwall ~]# 
> 

-- 
Dario Lesca <d.lesca at solinos.it>