Red Hat :: File System Corruption - Super Block Could Not Be Read Or Don't Describe A Clear Ext2 File System
Jul 12, 2010
My Redhat Enterprise Linux 4 with 6x partitions (/, /boot,/home, /usr, /var, /tmp) of 6.0 GB IDE Hardisk was working quite fine. I decided to create LVM on /home and /var partitions but due to some errors occured and I delete the /home partitions. That's why partition table altered. I then delete 4,5,and 6th partitions (/home, /var, /tmp) partitions and now try to create one by one but following error is coming:-
[Code]....
The Super block could not be read or do not describe a clear ext2 file system. E2fsck b 8193 <device> I have tried following commands,but could not successful:- e2fsck -p /dev/hda7 (where hda7 was created but afterthat it was deleted) e2fsck -a /dev/hda7
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Jan 28, 2011
I'm working on a midrange NAS system basically running on Linux and I got to do some great testing today. The step-by-step lead me to using fsdb to corrupt the magic number on a file system in order to corrupt it / test the script that should fix it.
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May 20, 2010
algorithm:breada
input: file system block number for immediate read
file system block number for asynchronous read
output:buffer containing data for immediate read {
if(first block not in cache) {
get buffer for first block
if(buffer data not valid)
initiate disk read }
if(second block not in cache) {
get buffer for second block)
if(buffer data valid) //line 1
release buffer else
initiate disk read //line 2 }
if(first block was originally in cache) //line 3 {
read first block
return buffer }
sleep (event first buffer contains valid data)
return buffer }
Here is an algorithm for block read algorithm. I have problem in
line 1: If buffer data is valid why is it releasing the buffer?
line 2: If buffer data valid why is it initiating disk read. It should have read directly from buffer?
line 3: It should be the first condition as if it is there in cache then it should return it without delay?
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Jul 12, 2010
[URL]
This problem has arrived again.......I tried the same solution but didn't work out...the problem is described below.
I use Ubuntu 9.10 .
I did this in Ubuntu 9.10 live CD.
quote from terminal :-
ubuntu@ubuntu:~$ sudo mkdir /win
ubuntu@ubuntu:~$ sudo mount /dev/sda5 /win
ubuntu@ubuntu:~$ sudo mkdir /vdisk
ubuntu@ubuntu:~$ sudo mount -o loop /win/ubuntu/disks/root.disk /vdisk
[Code]....
The superblock could not be read or does not describe a correct ext2 filesystem. If the device is valid and it really contains an ext2 filesystem (and not swap or ufs or something else), then the superblock is corrupt, and you might try running e2fsck with an alternate superblock:
e2fsck -b 8193 <device>
ubuntu@ubuntu:~$ "
> ^C
ubuntu@ubuntu:~$
^^ quote ends.
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May 2, 2010
I bought a new SD card which I intend to put some MP3s on - except that I can't write to it because it tells me the destination is Read Only. No-probs thinks I: I'll just reformat it.
"Error creating file system: helper exited with exit code 1: cannot open /dev/mmcblk0p1: Read-only file system"
Various chmod commands all result in Read-only file system. I tried umount then mount commands, but it couldn't find it to mount once I'd unmounted it using the same /media/ file path (I assume it's the only one).
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Feb 2, 2010
Have just assembled a new computer and thought I would install the 64 bit version of openSUSE 11.2 in a "Windows free zone". After a hiccup or two I have managed to get a system of sorts running but on trying to copy files from my old computer(via a memory stick) it tells me that Vfat is an unknown file system.On my old computer I am running 32 bit openSUSE 11.2 as a dual boot system with Windows XP and have no problems moving files between the two different file systems.Is it possible to get a 64 bit file system to read 32 bit file system drives and if so how do I do it?
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Apr 5, 2010
I've recently had my file system irrecoverably corrupted after a hard lock-up. This has happened to me before, a couple weeks ago, and both times I've had to reinstall. I don't know what is causing the lock-ups (possibly the binary nvidia driver..), but I would like my file system to be intact or at least recoverable next time it happens.What is the "safest" way to mount things?
I'll be using ext3 with data=journal, but I've read that disk write caching combined with a kernel crash or power loss can still screw things up. Supposedly, mounting with barrier=1 helps some, but doesn't work with LVM? Would it be wise to turn off disk write caching completely? I understand there's a performance penalty, but if it helps keep the file system consistent in case of disaster.
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Nov 13, 2010
how can i locate an Ext2 or Ext3 file system by using the terminal?
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Nov 1, 2010
Directories(-entries) are in a EXT2 file system
managed in a singly linked list.
Delete files in the directory causes Gaps or holes to appear in
the linked list of the directory.How does a C-source code look like,
which would reorganize this list and remove the gaps or Holes.
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Jul 21, 2010
I plugged in my USb drive into my computer yesterday and tried to delete a folder. I was unable to do so and got the following message
Cannot move file to trash, do you want to delete immediately? The file "my file" cannot be moved to the trash. Show Details Unable to create trashing info file: Read-only file system
So when I click on delete I get another error message:
Error while deleting.
There was an error deleting Case Study Database. Show Details Error removing file: Read-only file system
At this point I can only click on Skip, Skip All, or Cancel.
I have not changed anything on the stick recently so I dont know what is causing the problem.
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May 16, 2010
I just rebuild the kernel for slackware 13, everything works, but root file system which is ext3 is mounted as ext2. Normally I've build ext3, ext4 and so on as modules, not in the kernel... but if I do this, then the kernel mounts the file system as ext2, which is build in the kernel. I also modified rc.modules so I can make sure that ext3,ext4,jbd are loaded, but it doesnt work.
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Mar 27, 2010
I have dual boot system..i.e, windows XP and ubuntu 9.10(insatlled side by side). when i try to boot ubuntu, Im gettin sh:grub > prompt
[Code]...
I am getting something like this.. root mount file system failed.. ext2 ext3 ext4 ....... kernel panic message and hanged at kenelthreadhelpper+ what can i do.. I cant reinstall ubuntu again.. Because I have installed nany application there..
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Jan 28, 2011
Can windows read files from a home file server with an ext4 file system? or do I have to partition the drive with the server (ext4) and an ntfs partition with the files on?
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Jun 16, 2009
All my torrents go to my home/username/Download/ folder, I could read/write yesterday but now I cant even copy the files to a flash drive.The error i get is "Cannot create regular file '/home/username/Download/file' : Read only file system.
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Oct 22, 2010
since arch has started using python3, bleachbit is broken, so i am looking for a system cleaner to replace it. i need something that will overwrite file contents and clear firefox cache + the all the normal functions of a system cleaner.
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Nov 8, 2010
yesterday my downloads stopped working in transmission and gave an error: 'read-only file system'i have since found that all files on my eternal hard drive are now read only.i think it may have something to do with me recently changing the download location to my external hard drive in transmission. how i can rectify this and make it so i can read write again
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May 31, 2010
Was struggling with this for a little, no really clear answers around.Anyways, edit /etc/mstab, kill the entire line with the faulty drive.Unplug the drive/usb, restart, then do a
Code:
sudo fsck -r /dev/whatever
umount it, then remount and it should be fixed
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Feb 10, 2010
I have sandisk usb and want to get rid of the "U3" partition that's on it, but its a read-only file system. can't chmod to 777 from root
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Apr 25, 2010
I have a problem with my USB drive. When i try to make a file transfer, i get the error message which says that it is a 'read only file system' and i can not transfer any files. While looking for a way to solve the problem, i came across another case similar to what i have now which discussed in this thread: [URL]
However, i didn't understand how to resolve the problem from that thread.
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Sep 7, 2010
I have a file system that I can't seem to read and write to. I've tried everything I can think of.
Code:
root@xubuntu:/mnt/t1# ls -la
ls: cannot access .Trash-1000: Input/output error
[code]....
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Jan 28, 2011
I made a modification to the /etc/fstab using Ubuntu 10.04 and now it wont boot correctly. I can get the cli but when I enter /etc/fstab and make an edit it says" changing permission of /etc/fstab: read only file system"How can I mount the partition so that I can edit it
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Jan 19, 2011
i have used debugfs command and "open -w /dev/sda1" command, but i did not close it. the file system is in read-only mode now.
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Jul 17, 2011
rm: cannot remove `dny': Read-only file system
i am administrator :
[root@pty12237b ~]# id
uid=0(root) gid=0(root) groups=0(root)
[code]....
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Oct 9, 2009
i want to edit the file menu.lst in /boot/grub i m facing a problem of not to enter in to the graphical interphase, so i m using only the boot terminal whn i try to edit this file it says the file is read only. i tried to change the permission of file with chmod also
but it is also not working i tried the comand gksu gedit /boot/grub/menu.lst but it is not opening the file to edit since the graphical interphase is not there.
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Mar 15, 2011
Possible Duplicate: Cross-platform file system Can you please tell me what kind of file system can be read by MacOS X, Linux and Windows? And it can create a file greater 4 GB?
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Jan 16, 2010
I insert a certain cdrom into my DVD drive, the cd is mounted meaning I do can see the cd rom icon on my desktop. The cd rom icon name is the correct label of the cdrom but when I try to open the cdrom it results to be empty.
Then on the same computer I have installed Virtual Box and the Windows 7 image does read the content of the cdrom.
How can I read the content of the cdrom with ubuntu 9.10?
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May 22, 2010
I can't insert songs in my iPod nano.There is an error occurs which says that it is a 'read only file system' in ubuntu
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Oct 2, 2010
When trying to copy files from a local folder into a directory that is a mapping of my QNAP server I get an error message " Read-only file system" - and this only since a couple of days.Trying to change ownership with sudo chown also failed.
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Dec 15, 2010
I am trying ti set up a NFS server using the guide on [URL] However, the NFS mounts on the client side as a read-only file system, so I cannot modify nothing. Here is my /etc/export file on the server side:
Code:
/home/acrocephalus/ 192.168.1.35 (rw,async,no_root_squash)
and this is my /etc/fstab file relevant line on the client side
Code:
192.168.1.33:/home/acrocephalus/ /home/acrocephalus/AcrocephalusServer/ nfs rsize=8192,wsize=8192,timeo=14,intr
Then, I mount the system using the command
Code:
sudo mount /home/acrocephalus/AcrocephalusServer/
.
how to mount the NFS with full read-write permissions?
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Jan 28, 2011
I made a modification to the /etc/fstab using Ubuntu 10.04 and now it wont boot correctly. I can get the cli but when I enter /etc/fstab and make an edit it says" changing permission of /etc/fstab: read only file system" This is what I get when the system boots:
PHP Code:
[code]....
so if I choose manual I get to the cli and whenever I attempt to edit the file I get the above error. I used another machine and attempted to mount the drive but I get the same error I added notaime option to my fstab by accident so if I choose manual I get to the cli and whenever I attempt to edit the file I get the above error. I used another machine and attempted to mount the drive but I get the same error. I tried
PHP Code:
[code]...
and I get
PHP Code:
[code]....
How can I mount the partition so that I can edit it?
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