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Unable to mount/find new drives

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Special Forums Hardware Filesystems, Disks and Memory Unable to mount/find new drives
# 1  
Old 03-09-2009
Unable to mount/find new drives
Hi, I work offshore and we have a system that records excessive amounts of data (Terabytes), therefore we changed the 16 x 400GB drives to 16 x 1TB drives. However, since doing this, upon bootup, the system does not recognize the new drives. These drives are external drives in a chassis which is connected to the computer via SCSI lead. See quote below email to IT assistant:

Quote:
Yesterday we switched the drive chassis off and changed the hard drives from 400 GB to 1 TB. We then switched the chassis back on and it initialized itself which took 6 hours. We did not switch off the computer at all.

We then tried to reboot the computer and the following message keeps coming up

Quote:
No such file or directory while trying to open / dev/vol1/raid1

/dev/vol1/raid1:

The superblock could not be read or does not describe a correct ext2 file system. If the device is valid and it really contains an ext2 file system (and not swop or ufs or something else), then the superblock is corrupt and you might try running e2fsck with an alternate superblock

e2fsck -b 8193 <device> [ failed ]

it then come up with alt d for maintenance menu or enter to re-boot
Any help would be appreciated,
Kind regards
Russ
# 2  
Old 03-10-2009
google for rescan-scsi-bus.sh

run this script, then run lvmdiskscan
you should see your new drives

Otherwise, the cable is not attached/terminated properly
# 3  
Old 03-10-2009
Quote:
Originally Posted by mark54g
google for rescan-scsi-bus.sh

run this script, then run lvmdiskscan
you should see your new drives

Otherwise, the cable is not attached/terminated properly

Thanks for your reply, however what I've been told, is that we can see the drives but on intial boot up reporting, it sees the SCSI and two RAID arrays connected and the first two TB slices of each array. However, we had not unmounted the old array before creating the new one. Now on boot up, the servers operating system crashes when trying to mount the new device. We can not get into a command prompt to edit the boot config file.

Any ideas?
# 4  
Old 03-10-2009
When you get the maintenance notification, are you able to log in with the root password?
# 5  
Old 03-10-2009
Quote:
Originally Posted by Radar
When you get the maintenance notification, are you able to log in with the root password?
Upon boot up this is what they get:

Quote:
***error occurred during the file system check
*** Dropping you to a shell; the system will reboot
*** when you leave the shell.
Press enter for maintenance
(or type Control-D to continue): _
When enter is pressed, a message similiar to the following appears:
Quote:
repair filesystem 1 #
if Y is entered it goes to:
Quote:
repair filesystem 2 #
if Y is entered it goes to repair filesystem 3 # and just keeps incrementing.

If N is entered it does the same thing.

What are you suppose to enter at this stage?
Kind regards
Russ
Last edited by shamrocks; 03-10-2009 at 09:06 PM..
# 6  
Old 03-12-2009
at the prompt when you boot to choose your kernel type "linux 1" and then you should be in single user mode.

Then, edit the /etc/fstab and remove the entries for the other array. You may also need to run a vgscan and do any lvremoves and vgremoves that you need to do.
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