Hi,

Not entirely new to Linux but this is likely a newbie question for most of you other gurus out there. I have a 3TB USB drive for which I had used gparted and changed it to GPT and then had formated it ext4. I had gone through the work of finding out how to properly align it however the command that I used slips my mind right now. I know that I did properly align it when I used gparted. That being said, I used blkid to find the UUID of the volume and added a line to /etc/fstab to mount it on startup. Everything was working great. I had an issue that I had to reboot the machine for and I got a failure with fsck trying to check that volume (I had put a 2 in the 6th field of the fstab which I probably should have put a 0) so I got the system booted by appending fastboot to the grub line so it wouldn't try to check the volume. I edited /etc/fstab and changed the 2 to a 0 and now the system boots.

All that to say that when the system boots it will not mount the volume. /dev/sda1 does not exist in the /dev directory and looking at dmesg I'm seeing sda: unknown partition table.

Not sure where to go from here. Help!

Rich

More details on your boot and other pertinent information can be obtained by running the bootinfoscript downloaded from the site below and posting the results.txt file.
http://sourceforge.net/projects/bootinfoscript/

Bootinfo Script Results:


Boot Info Script 0.61 [1 April 2012]


============================= Boot Info Summary: ===============================

=> No boot loader is installed in the MBR of /dev/sda.

sda1: __________________________________________________________________________

File system:
Boot sector type: Unknown
Boot sector info:
Mounting failed: mount: unknown filesystem type ''

vg_backup-lv_root': ____________________________________________________________

File system:
Boot sector type: Unknown
Boot sector info:
Mounting failed: mount: unknown filesystem type ''
mount: unknown filesystem type ''

vg_backup-lv_home': ____________________________________________________________

File system:
Boot sector type: Unknown
Boot sector info:
Mounting failed: mount: unknown filesystem type ''
mount: unknown filesystem type ''
mount: unknown filesystem type ''

vg_backup-lv_swap': ____________________________________________________________

File system:
Boot sector type: Unknown
Boot sector info:
Mounting failed: mount: unknown filesystem type ''
mount: unknown filesystem type ''
mount: unknown filesystem type ''
mount: unknown filesystem type ''

============================ Drive/Partition Info: =============================

Drive: sda _____________________________________________________________________
Note: sector size is 4096 (not 512)

Disk /dev/sda: 3000.6 GB, 3000592977920 bytes
255 heads, 63 sectors/track, 45600 cylinders, total 732566645 sectors
Units = sectors of 1 * 4096 = 4096 bytes

Partition Boot Start Sector End Sector # of Sectors Id System

/dev/sda1 1 4,294,967,295 4,294,967,295 ee GPT


GUID Partition Table detected.

Partition Start Sector End Sector # of Sectors System
/dev/sda1 2,048 2,639,306,751 2,639,304,704 Data partition (Windows/Linux)

"blkid" output: ________________________________________________________________

Device UUID TYPE LABEL

/dev/cciss/c1d0p1 46827432-53c2-4041-a57b-dfb57110db00 ext4
/dev/cciss/c1d0p2 0qb1IG-oodK-12oB-Qxf9-STr7-SD9s-qm7d49 LVM2_member
/dev/mapper/vg_backup-lv_home 901d0985-388d-4172-a2f5-4df5fa5bd223 ext4
/dev/mapper/vg_backup-lv_root cb4aa8de-2555-4b9b-bc43-12ebc698d0a8 ext4
/dev/mapper/vg_backup-lv_swap 3abbd3bf-f327-4ac9-9931-14599f83c4f8 swap

========================= "ls -R /dev/mapper/" output: =========================

/dev/mapper:
control
vg_backup-lv_home
vg_backup-lv_root
vg_backup-lv_swap

================================ Mount points: =================================

Device Mount_Point Type Options

/dev/cciss/c1d0p1 /boot ext4 (rw)
/dev/mapper/vg_backup-lv_home /home ext4 (rw)
/dev/mapper/vg_backup-lv_root / ext4 (rw)


======================== Unknown MBRs/Boot Sectors/etc: ========================

Unknown BootLoader on sda1


Unknown BootLoader on vg_backup-lv_root'


Unknown BootLoader on vg_backup-lv_home'


Unknown BootLoader on vg_backup-lv_swap'



=============================== StdErr Messages: ===============================

hexdump: /dev/sda1: No such file or directory
hexdump: stdin: Bad file descriptor.
hexdump: /dev/sda1: No such file or directory
hexdump: /dev/sda1: Bad file descriptor
One or more specified logical volume(s) not found.
One or more specified logical volume(s) not found.
One or more specified logical volume(s) not found.
hexdump: /dev/mapper/vg_backup-lv_root': No such file or directory
hexdump: stdin: Bad file descriptor.
hexdump: /dev/mapper/vg_backup-lv_root': No such file or directory
hexdump: /dev/mapper/vg_backup-lv_root': Bad file descriptor
One or more specified logical volume(s) not found.
One or more specified logical volume(s) not found.
One or more specified logical volume(s) not found.
hexdump: /dev/mapper/vg_backup-lv_home': No such file or directory
hexdump: stdin: Bad file descriptor.
hexdump: /dev/mapper/vg_backup-lv_home': No such file or directory
hexdump: /dev/mapper/vg_backup-lv_home': Bad file descriptor
One or more specified logical volume(s) not found.
One or more specified logical volume(s) not found.
One or more specified logical volume(s) not found.
hexdump: /dev/mapper/vg_backup-lv_swap': No such file or directory
hexdump: stdin: Bad file descriptor.
hexdump: /dev/mapper/vg_backup-lv_swap': No such file or directory
hexdump: /dev/mapper/vg_backup-lv_swap': Bad file descriptor
mdadm: No arrays found in config file or automatically

---------- Post added 10-20-14 at 01:25 PM ----------

Bootinfo Script Results:


Boot Info Script 0.61 [1 April 2012]


============================= Boot Info Summary: ===============================

=> No boot loader is installed in the MBR of /dev/sda.

sda1: __________________________________________________________________________

File system:
Boot sector type: Unknown
Boot sector info:
Mounting failed: mount: unknown filesystem type ''

vg_backup-lv_root': ____________________________________________________________

File system:
Boot sector type: Unknown
Boot sector info:
Mounting failed: mount: unknown filesystem type ''
mount: unknown filesystem type ''

vg_backup-lv_home': ____________________________________________________________

File system:
Boot sector type: Unknown
Boot sector info:
Mounting failed: mount: unknown filesystem type ''
mount: unknown filesystem type ''
mount: unknown filesystem type ''

vg_backup-lv_swap': ____________________________________________________________

File system:
Boot sector type: Unknown
Boot sector info:
Mounting failed: mount: unknown filesystem type ''
mount: unknown filesystem type ''
mount: unknown filesystem type ''
mount: unknown filesystem type ''

============================ Drive/Partition Info: =============================

Drive: sda _____________________________________________________________________
Note: sector size is 4096 (not 512)

Disk /dev/sda: 3000.6 GB, 3000592977920 bytes
255 heads, 63 sectors/track, 45600 cylinders, total 732566645 sectors
Units = sectors of 1 * 4096 = 4096 bytes

Partition Boot Start Sector End Sector # of Sectors Id System

/dev/sda1 1 4,294,967,295 4,294,967,295 ee GPT


GUID Partition Table detected.

Partition Start Sector End Sector # of Sectors System
/dev/sda1 2,048 2,639,306,751 2,639,304,704 Data partition (Windows/Linux)

"blkid" output: ________________________________________________________________

Device UUID TYPE LABEL

/dev/cciss/c1d0p1 46827432-53c2-4041-a57b-dfb57110db00 ext4
/dev/cciss/c1d0p2 0qb1IG-oodK-12oB-Qxf9-STr7-SD9s-qm7d49 LVM2_member
/dev/mapper/vg_backup-lv_home 901d0985-388d-4172-a2f5-4df5fa5bd223 ext4
/dev/mapper/vg_backup-lv_root cb4aa8de-2555-4b9b-bc43-12ebc698d0a8 ext4
/dev/mapper/vg_backup-lv_swap 3abbd3bf-f327-4ac9-9931-14599f83c4f8 swap

========================= "ls -R /dev/mapper/" output: =========================

/dev/mapper:
control
vg_backup-lv_home
vg_backup-lv_root
vg_backup-lv_swap

================================ Mount points: =================================

Device Mount_Point Type Options

/dev/cciss/c1d0p1 /boot ext4 (rw)
/dev/mapper/vg_backup-lv_home /home ext4 (rw)
/dev/mapper/vg_backup-lv_root / ext4 (rw)


======================== Unknown MBRs/Boot Sectors/etc: ========================

Unknown BootLoader on sda1


Unknown BootLoader on vg_backup-lv_root'


Unknown BootLoader on vg_backup-lv_home'


Unknown BootLoader on vg_backup-lv_swap'



=============================== StdErr Messages: ===============================

hexdump: /dev/sda1: No such file or directory
hexdump: stdin: Bad file descriptor.
hexdump: /dev/sda1: No such file or directory
hexdump: /dev/sda1: Bad file descriptor
One or more specified logical volume(s) not found.
One or more specified logical volume(s) not found.
One or more specified logical volume(s) not found.
hexdump: /dev/mapper/vg_backup-lv_root': No such file or directory
hexdump: stdin: Bad file descriptor.
hexdump: /dev/mapper/vg_backup-lv_root': No such file or directory
hexdump: /dev/mapper/vg_backup-lv_root': Bad file descriptor
One or more specified logical volume(s) not found.
One or more specified logical volume(s) not found.
One or more specified logical volume(s) not found.
hexdump: /dev/mapper/vg_backup-lv_home': No such file or directory
hexdump: stdin: Bad file descriptor.
hexdump: /dev/mapper/vg_backup-lv_home': No such file or directory
hexdump: /dev/mapper/vg_backup-lv_home': Bad file descriptor
One or more specified logical volume(s) not found.
One or more specified logical volume(s) not found.
One or more specified logical volume(s) not found.
hexdump: /dev/mapper/vg_backup-lv_swap': No such file or directory
hexdump: stdin: Bad file descriptor.
hexdump: /dev/mapper/vg_backup-lv_swap': No such file or directory
hexdump: /dev/mapper/vg_backup-lv_swap': Bad file descriptor
mdadm: No arrays found in config file or automatically

I'm surprised that sda1 id "unknown filesystem" as that should be a separate boot partition. My understanding is that if you are using GPT with a UEFI system, you need a separate EFI partition and if you are using it without EFI, you need Grub in the MBR and a separate BIOS boot partition. I don't use UEFI boot and am not familiar with LVM so hopefully someone else will come along.

Not booting from it. This is a HP proliant server with a smart array (cciss) with an internal array. The sda1 is the removable USB drive which is gpt partition table and formated with ext4 fs. Problem is I can't access it now for whatever reason and I'm not sure why.

EDIT: Also this system is not UEFI.

Rich

When you type
what does it say?

Might want to give this one a look:
http://www.linuxquestions.org/questi...ab-4175463357/

EDIT: If you can boot it from a live USB/CD and upload your fstab file, that'd be great. It may have gotten borked while saving.

Here is fstab:


#
# /etc/fstab
# Created by anaconda on Tue Jul 29 15:48:08 2014
#
# Accessible filesystems, by reference, are maintained under '/dev/disk'
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
/dev/mapper/vg_backup-lv_root / ext4 defaults 1 1
UUID=46827432-53c2-4041-a57b-dfb57110db00 /boot ext4 defaults 1 2
/dev/mapper/vg_backup-lv_home /home ext4 defaults 1 2
/dev/mapper/vg_backup-lv_swap swap swap defaults 0 0
tmpfs /dev/shm tmpfs defaults 0 0
devpts /dev/pts devpts gid=5,mode=620 0 0
sysfs /sys sysfs defaults 0 0
proc /proc proc defaults 0 0
UUID=cbfd6352-07e5-4987-b062-1411d55e2799 /backup/alwayson ext4 defaults 0 0


The last line was the line I had used to mount that drive. Right now I can't get any UUID for that drive when using blkid.

Rich

closes stables door after horse has bolted...but, I don't suppose you kept a copy of your old fstab which you could revert to?

How about commenting out the last line of fstab to see whether that is the cause of your problems? I normally try a to ensure I can mount before rebooting.

Just a few random thoughts.

The only thing that I changed was the last 0 in the 6th field position on the last line... it was 2 instead of 0 in which it makes fsck check the filesystem upon boot. The error that it gave is it couldn't locate the filesystem with that UUID so fsck failed and hence halted the boot process.

Since that UUID doesn't exist that line will do nothing.

I think this problem is more circling around the issue that the drive is GPT and the partition is > 2TB.

Anyone have any clues about this?

Rich

Could this be part of my problem? :

[root@backup ~]# parted /dev/sda
Warning: Device /dev/sda has a logical sector size of 4096. Not all parts of GNU Parted support this at the moment, and the working code is HIGHLY EXPERIMENTAL.

I get this message when going into Parted. When trying to print the partition table I get:

(parted) p
Error: /dev/sda: unrecognised disk label

I read something somewhere about 4k sectors...

Rich