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RE: how to boot from second disk



You should compare your DELL's BIOS boot sequence between the working servers and the one in question.  I believe you have an ordering issue on which drive takes precedence at the BIOS level, not the PERC SCSI card's firmware.  If still in doubt, you should pose this question to DELL's support knowledge base.  Good luck!

-----Original Message-----
From: redhat-list-bounces redhat com [mailto:redhat-list-bounces redhat com] On Behalf Of mcclnx mcc
Sent: Tuesday, August 01, 2006 4:47 PM
To: General Red Hat Linux discussion list
Subject: Re: how to boot from second disk

Actually this method has been apply on our environment
for several years and work correctly on DELL 265o and
6850 servers.   I just have problem on DELL 6800
server.


--- David Miller <millerdc fusion gat com> �f:

> What you are doing is not possible with that method.
> Besides using  
> some true bare-metal bit-by-bit cloning tool you
> will have to do a  
> lot more work for recovery. You will have to use
> fdisk to setup the  
> partitions, dump a working MBR on the drive, create
> the filesystems  
> on the parttions using mke2fs and mkswap. Then you
> can restore your  
> data on the partitions. Your best bet is to try and
> get a working  
> RAID1 for your boot drive and prey that both disks
> don't die before  
> the server is retired.
> 
> On Jul 31, 2006, at 5:58 PM, mcclnx mcc wrote:
> 
> > We have Redhat As 4.3 on DELL 6800 server.  I am
> doing recovery  
> > test and tried to boot from second disk (which use
> dump to sync  
> > first disk).  My procedure are:
> >
> > 1. "mkbootdisk" to create bootable CD
> >
> > 2. reboot server and go CTL-M on PERC 4e/dc
> firmware menu.  Change  
> > boot device to "2"
> >
> > 3. put bootable CD to CD-ROM.  Reboot
> >
> > 4. it still boot from first disk instead of second
> disk.
> >
> > any one know how to boot from second disk or
> command "boot:  xxxx"  
> > to second disk?
> >
> >
> > Thanks.
> >
> >
> > 
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