[GLLUG] knoppix; read-write mounts spontaneously become read-only...?

[bfdamkoehler at worldnet.att.net]

I agree about running fsck. This just happened to me the other day on a 
ext3 filesystem on a USB drive. I realized that the drive needed 
checking when I saw the filesystem errors in /var/log/messages.  I guess 
that automounted drives don't run fsck like those in /etc/fstab. 


Daniel Hedlund wrote:

> Scott,
>
> Scott Harrison wrote:
>
>> After minimal writing of data to the disk (a few
>> hundred kilobytes), /proc/mounts changes and the drive
>> becomes read-only (while the "mount" command still
>> shows the drive being read-write).
>
>
> I believe what is happening is that sometime during the copying of 
> files to the partition, the EXT2/3 driver is detecting 
> errors/anomalies/out-of-syncness on the filesystem and switching 
> itself to read-only to protect itself.  I've had this happen on a 
> couple of occasions when copying a lot of files across to another hard 
> disk.
>
> The first steps you need to take are to make sure the ext3 partition 
> is free from any errors by running fsck, ie:
> fsck /dev/sda1
>
> If this detects any problems, correct them and run fsck again to be 
> sure everything is fixed.  You should also double-check that your hard 
> disk is in reasonable condition and it's not starting to experience 
> any hardware-related issues.  I'm not sure how to do this with SCSI 
> hard disks, but IDE ones you can use smartctl.
>
> I hope this gets you somewhere.
>
> Cheers,
>
> Daniel Hedlund
> daniel at digitree.org
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