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chilos
n00b
Joined: 02 Mar 2018
Posts: 19
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 Posted: Sat Mar 10, 2018 5:11 am Post subject: Failed to mount /dev/sda4 |
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Hey, guys. I tried installing gentoo according to the amd64 handbook and I screwed it up. So, I went back to the section with the partitions and remade all my partitions (this time with the mklabel msdos instead of gpt). I thought this might solve my problem. But, now, I am able to mount the other partitions, but not my root partition (/dev/sda4).
when I enter:
#mount /dev/sda4 /mnt/gentoo
It gives me an error: "failed to mount '/dev/sda4' invalid argument."
Any help?
I thought reformatting the drives would give me a clean slate.
-chilos
edit:
I also tried the system rescue cd before reformatting the drives (again) and it hung up on mounting /dev/sda4 as well. |
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NeddySeagoon
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| Posted: Sat Mar 10, 2018 12:28 pm Post subject: |
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chilos,
What does show ?
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NeddySeagoon
Computer users fall into two groups:-
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chilos
n00b
Joined: 02 Mar 2018
Posts: 19
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| Posted: Sat Mar 10, 2018 9:38 pm Post subject: |
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It shows my four partitions with a star for boot next to the /dev/sda2 partition. The type for all 4 partitions is 'Linux'. The id for all four is 83. The partition sizes are 2 M, 128 M, 512 M, and 465.1 G respectively. The first line says: "Disk /dev/sda: 465.8 GiB, 500107862016 bytes, 976773168 sectors."
I can take a picture if this doesn't suffice. |
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NeddySeagoon
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Joined: 05 Jul 2003
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Location: 56N 3W
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| Posted: Sat Mar 10, 2018 9:56 pm Post subject: |
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chilos,
I prefer the link you get from | Code: | | wgetpaste -c 'fdisk -l /dev/sda' |
as I can't copy and paste from a picture.
What you posted sounds correct.
Do you have a /dev/sda4 ?
What does show.
The ? in the command is a wildcard for any one symbol.
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NeddySeagoon
Computer users fall into two groups:-
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chilos
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Joined: 02 Mar 2018
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NeddySeagoon
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Joined: 05 Jul 2003
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Location: 56N 3W
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| Posted: Sun Mar 11, 2018 12:19 am Post subject: |
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chilos,
That all looks good. What are the permissions on sda4 ?
will show it.
It should be | Code: | $ ls -l /dev/sda4
brw-rw---- 1 root disk 8, 4 May 12 2013 /dev/sda4 |
What filesystem type did you make on /dev/sda4 ?
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NeddySeagoon
Computer users fall into two groups:-
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chilos
n00b
Joined: 02 Mar 2018
Posts: 19
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| Posted: Sun Mar 11, 2018 1:39 am Post subject: |
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yields:
| Code: | | brw-rw---- 1 root disk 8, 4 Mar 11 01:37 /dev/sda4 |
Looks good, right? What else could it be? |
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grumblebear
Apprentice
Joined: 26 Feb 2008
Posts: 202
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| Posted: Sun Mar 11, 2018 2:06 am Post subject: |
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Did you forget to create the mountpoint?
mkdir -p /mnt/gentoo
Also, you have to create a filesystem (with mkfs) on the /dev/sda4 partition before trying to mount it. |
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chilos
n00b
Joined: 02 Mar 2018
Posts: 19
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| Posted: Sun Mar 11, 2018 3:09 am Post subject: |
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| I believe I have the mount point already (I have a /mnt/gentoo directory already--is that it?). My /dev/sda4 has a ext4 file system. |
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NeddySeagoon
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| Posted: Sun Mar 11, 2018 11:42 am Post subject: |
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chilos,
That's all the right answers so far.
What does | Code: | | mount -t ext4 /dev/sda4 /mnt/gentoo |
tell?
Look at the end of too.
If that mount fails, what does
Do not run that command if the mount works.
_________________
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NeddySeagoon
Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail. |
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C5ace
Guru
Joined: 23 Dec 2013
Posts: 472
Location: Brisbane, Australia
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| Posted: Sun Mar 11, 2018 12:00 pm Post subject: |
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I had a similar problem when changing from gtp to msdos partitions. My solution was to to run overnight.
| Code: |
dd if=/dev/zero of=/dev/sda bs=4096
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Then partition the drive with fdisk:
| Code: |
Disk /dev/sda: 931.5 GiB, 1000204886016 bytes, 1953525168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: dos
Disk identifier: 0x614c7c1d
Device Boot Start End Sectors Size Id Type
/dev/sda1 * 2048 1026047 1024000 500M 83 Linux
/dev/sda2 1026048 1953525167 1952499120 931G 5 Extended
/dev/sda5 1028096 17805311 16777216 8G 82 Linux swap / Solaris
/dev/sda6 17807360 80721919 62914560 30G 83 Linux
/dev/sda7 80723968 1863303167 1782579200 850G 83 Linux
/dev/sda8 1863305216 1953525167 90219952 43G 83 Linux
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# Create the File System:
| Code: |
mkfs.ext4 -L HP_BOOT /dev/sda1
mkfs.ext4 -L HP_ROOT /dev/sda6
mkfs.ext4 -L HP_HOME /dev/sda7
mkfs.ext4 -L HP_VBOX /dev/sda8
mkswap -L HP_SWAP /dev/sdf5
swapon -L HP_SWAP
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# /etc/fstab:
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#<fs> <mountpoint> <type> <opts> <dump/pass>
LABEL=HP_BOOT /boot ext4 noatime 1 2
LABEL=HP_ROOT / ext4 noatime 0 1
LABEL=HP_HOME /home ext4 noatime 0 2
LABEL=HP_VBOX /VirtualBox ext4 noatime 0 2
LABEL=HP_SWAP none swap sw 0 0
/dev/cdrom /mnt/cdrom auto noauto,ro 0 0
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# Mount the Filesystem:
| Code: |
mount LABEL=HP_ROOT /mnt/gentoo
mkdir /mnt/gentoo/boot
mount LABEL=HP_BOOT /mnt/gentoo/boot
mkdir /mnt/gentoo/home
mount LABEL=HP_HOME /mnt/gentoo/home
mkdir /mnt/gentoo/VirtualBox
mount LABEL=HP_VBOX /mnt/gentoo/VirtualBox
cd /mnt/gentoo
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Bootloader: sys-boot/grub-static
# /boot/grub/grub.conf
| Code: |
default 0
timeout 10
title HP Gentoo Linux 4.9.72-gentoo
root (hd0,0)
kernel /boot/kernel-genkernel-HP-x86_64-4.9.72-gentoo net.ifnames=0 real_root=LABEL=HP_ROOT scandelay=5 ro ipv6.disable=1
initrd /boot/initramfs-genkernel-HP-x86_64-4.9.72-gentoo
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The above is for my HP laptop. |
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NeddySeagoon
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Joined: 05 Jul 2003
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Location: 56N 3W
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| Posted: Sun Mar 11, 2018 1:06 pm Post subject: |
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C5ace,
That seems excessive. Your | Code: | | dd if=/dev/zero of=/dev/sda bs=4096 |
will be very slow too.
dd gets faster with increasing block size up to approximately bs=1M.
The block size here is not your drive physical block size, its the size of the transfers that dd will perform.
_________________
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NeddySeagoon
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those that do backups
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Jaglover
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Posts: 8291
Location: Saint Amant, Acadiana
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mike155
Advocate
Joined: 17 Sep 2010
Posts: 4438
Location: Frankfurt, Germany
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| Posted: Sun Mar 11, 2018 1:31 pm Post subject: |
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What makes we wonder is the error message: 'failed to mount '/dev/sda4' invalid argument.'
I tried to reproduce this error - but not matter what I do: I don't get this message. I get 'special device ... does not exist.', 'mount point does not exist', 'mount point is not a directory' and so on - but not 'invalid argument'.
There must be something totally wrong. Maybe C5ace is right... |
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NeddySeagoon
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Location: 56N 3W
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| Posted: Sun Mar 11, 2018 1:37 pm Post subject: |
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mike155,
I tried to provoke that error and failed too.
_________________
Regards,
NeddySeagoon
Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail. |
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Tony0945
Watchman
Joined: 25 Jul 2006
Posts: 5127
Location: Illinois, USA
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| Posted: Sun Mar 11, 2018 3:43 pm Post subject: |
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| I had this problem last week. Unfortunately the filesystem was bad. The first thing that fsck reported was that the partition size reported exceeded the size of the disk. |
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Hu
Moderator
Joined: 06 Mar 2007
Posts: 21607
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| Posted: Sun Mar 11, 2018 4:33 pm Post subject: |
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On the speculation that Tony's issue might be the one that the OP is experiencing, the output of dumpe2fs -h /dev/sda4 might be interesting.
Also, OP, what exactly did you do when you "reformatted" the drives? What commands did you run, and in what order? |
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chilos
n00b
Joined: 02 Mar 2018
Posts: 19
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| Posted: Sun Mar 11, 2018 8:08 pm Post subject: |
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| NeddySeagoon wrote: | chilos,
That's all the right answers so far.
What does | Code: | | mount -t ext4 /dev/sda4 /mnt/gentoo |
tell?
Look at the end of too.
If that mount fails, what does
Do not run that command if the mount works. |
ok
| Code: | | # mount -t ext4 /dev/sda4 /mnt/gentoo |
gives error: "mount: /mnt/gentoo: wrong fs type, bad option, bad superblock on /dev/sda4, missing codepage or helper program, or other error."
at the bottom of
I have a line that says, "EXT4-fs (sda4): can't read group descriptor 1"
says: fsck.ext2: Attempt to read block from filesystem resulted in short read while trying to open /dev/sda4. Could this be a zero-length partition?
| Hu wrote: | On the speculation that Tony's issue might be the one that the OP is experiencing, the output of dumpe2fs -h /dev/sda4 might be interesting.
Also, OP, what exactly did you do when you "reformatted" the drives? What commands did you run, and in what order?
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I just followed the amd64 handbook. I first used then to delete the partitions then I remade them with mkpart.
| Code: | | dumpe2fs -h /dev/sda4 |
gives error: dump2fs: Attempt to read block from filesystem resulted in short read while trying to open /dev/sda4. Couldn't find valid filesystem superblock.
Thanks for the help so far guys. |
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NeddySeagoon
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Joined: 05 Jul 2003
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Location: 56N 3W
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| Posted: Sun Mar 11, 2018 8:15 pm Post subject: |
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chilos,
Either sda4 is an extended partition, which is just a fake to reserve space or the filesystem is corrupt.
Try remaking the filesystem.
| Code: | | mke2fs -t ext4 /dev/sda4 |
Post the output if you can.
_________________
Regards,
NeddySeagoon
Computer users fall into two groups:-
those that do backups
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chilos
n00b
Joined: 02 Mar 2018
Posts: 19
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| Posted: Sun Mar 11, 2018 9:58 pm Post subject: |
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Can't post it all very easily. The last lines are:
Allocating group tables: done
Writing inode tables: done
Creating journal: done
Writing super blocks and filesystem accounting information: done
Looks like it worked, right?
Should I go ahead and try to mount my root partition again? |
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NeddySeagoon
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| Posted: Sun Mar 11, 2018 10:35 pm Post subject: |
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chilos,
Yes, that looks good. You would have got an error trying that on an extended partition.
You should be good to mount /dev/sda4 now.
_________________
Regards,
NeddySeagoon
Computer users fall into two groups:-
those that do backups
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chilos
n00b
Joined: 02 Mar 2018
Posts: 19
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| Posted: Sun Mar 11, 2018 10:41 pm Post subject: |
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| Thanks! No error message when I mounted it. Anyway to verify it worked though? |
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NeddySeagoon
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| Posted: Sun Mar 11, 2018 10:43 pm Post subject: |
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chilos,
Look in
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NeddySeagoon
Computer users fall into two groups:-
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Installing Gentoo
