Sorry, I didn't mention the details of system and what happened. Backgroud is simply like this.
I installed CentOS6.2 on four different system. I intended to make one server and three clusters for operating some software.
Now, "Kernel panic" has happened on the server pc. The only difference between the server pc and pc cluster is hard disk type.
Server is made up for LSI megaraid disks (SAS) and the others are made up for normal sata disks.
When CentOS was installed on server pc, I used a driver disk for setting the SAS.
It was not first boot. However, I did some "yum update" before the "kernel panic" happened.
But the other system also did same update in exactly same enviorment.
After upload the question here, I tried to boot the system with installation DVD (1) - rescue mode.
Rescue message said that input "chroot /mnt/sysimage" on the console and then reboot system automatically.
But not happend reboot automatically and still have same problem - "kernel panic..."
I suppose that the system couldn't find kenrel image at specified mount point "root (hd0,0)" which is specified in grub.conf.
SAS could be affeted by some "yum update"? If so, why it still makes a "kernel panic" even after new installation?