Help! Head crash on IDE Seconday Master. Slave has all the data but wont boot

Help! Head crash on IDE Seconday Master. Slave has all the data but wont boot

[Stuart Levine]

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Hi,

So I build this great new P4 2.53GHz server.  I had two WD 100GB Caviar 
Special editions running in a RAID1 format.  All seemed fine except one 
drive was very noisy and caused excessive vibrations.  Thought nothing 
of it because it's less than a month old.  Well, I was wrong, very 
wrong.  Last night the drive failed and the next boot up sequence left 
me with sound I will never forget.  Anyway, until I get a new drive to 
rebuild and supplant the array, I was going to boot from /dev/md0 (/boot 
partition) but to no avail the system does not want to recognize it as a 
boot disk.  If I boot up in rescue mode, it says there are no partitions 
on the disk (/dev/md0).  However, if I use the fdisk -l I get what you 
would expect including a BOOT partition.  Luckily, I did make the 
emergency boot floppy and I am able to boot the system on from that 
floppy for the ROOT partition on the disk /dev/md2.  So, how do I tell 
the boot loader to look at /dev/hdd instead of /dev/hdc (the dead disk 
in the raid pair) without loosing my installed data?  I now new to RAID, 
however, I am new to software RAID in Linux.  Any help and advise would 
be greatly appreciated.

Thanks in advance,

Stuart

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Re: Help! Head crash on IDE Seconday Master. Slave has all the data but wont boot

[Massimiliano Masserelli]

On Sat, Nov 23, 2002 at 07:38:32AM -0500, Stuart Levine wrote:

> the boot loader to look at /dev/hdd instead of /dev/hdc (the dead disk 
> in the raid pair) without loosing my installed data?

Try connecting your hdd as hdc (ie, set it as master disk). No other
changes should be needed, nor should you switch it back when you will
place the new disk in (as slave, of course).

Hope it helps.
-- 
Massimiliano Masserelli
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