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

[Scott Harrison]

Just as a follow-up, fsck.ext3 did indeed make things work
normally.  Thanks to everybody for this very helpful thread! 


bfdamkoehler at worldnet.att.net writes: 

> 
> 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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>> 
> 
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