[clue-tech] fsck and badblocks

[Angelo Bertolli]

David Anselmi wrote:
> Angelo Bertolli wrote:
> 
>> I was reading the man page for badblocks and it says to use it by 
>> using the -c option with fsck.  Does this mean that fsck doesn't check 
>> for bad blocks automatically?  How would you do a reboot/fsck with the 
>> -c option?
> 
> 
> No, fsck does not check for bad blocks automatically (checking every 
> block takes a long time).  You ask it to by:
> 
> e2fsck -c [other options] device
> 
> where device is the device file for your partition.
> 
> Do you need to reboot to run fsck?  No.  Do you need to run it on an 
> unmounted or read-only partition?  Possibly, but it probably doesn't 
> matter if you aren't fixing anything.
> 

If my entire filesystem is mounted on /, can I just do a

mount -o remount,ro /

And then run e2fsck?  Will that have any adverse effects on a production 
server?  I really think it needs to be done.  Sometimes when I cat or 
grep files, I get "Input/output error" ... and I'm guessing that's a 
problem with the file system.  Even though this means some things may be 
unavailable for a while, I think this is probably better than rebooting 
a server I don't have physical access to (tried that before).

Angelo