Stress testing the UFS2 filesystem

[Kris Kennaway]

On Wed, May 03, 2006 at 02:03:55PM +0400, Pavel Merdine wrote:
> Hello ,
> 
> 
> 
> Wednesday, May 3, 2006, 2:13:07 AM, you wrote:
> 
> > On Wed, May 03, 2006 at 12:32:29AM +0400, Pavel Merdine wrote:
> >> Hello ,
> >> 
> >> Thank you for raising this problem again. I already tried to do that
> >> in that list, but received an answer that kernel is intended to do
> >> that. For example, you have a faulty disk. And you have a faulty
> >> sector which happened to occur on the directory place. So each time
> >> kernel reads this sector it panics. So it's initially hard to even
> >> understand what happens. And also it leads to corruption and lost
> >> files on other file system (each time). Imagine if you have 15 disks.
> >> In this case you have many files lost just because of a small (and not
> >> significant) fault. It's just a nonsense.
> >> Personally, I just replaced bad_dir with error return.
> >> By the way, there was some bug in fs in kernel that could lead to
> >> panic even on clean filesystem (bad_dir as far as I remember). It is
> >> very rare and it was fixed on DragonFly. As far as I remember a fix
> >> for this was also commited to current recently.
> >> 
> >> I think that Linux is usually much smarter on this. By default it
> >> remounts a file system as read-only in case it detects a filesystem
> >> corruption. I would be very happy if FreeBSD could do the same,
> >> because fs panics really hurt when you have many systems with disks.
> >> 
> >> Of course I think we could do patches to overcome corrupting panics,
> >> but the core FreeBSD team would not accept this, as they are happy
> >> with panics and corruptions they make to other filesystems.
> 
> > Of course not, don't make silly accusations :-)
> > The problem is much more difficult to solve than "making the panic an
> > error return".
> 
> I think that is you who call me silly. I did not mean what you wrote.
> Where did I say that? I just said I made an error return for myself.

And you accused the "core FreeBSD team" of being happy with panics and
filesystem corruption.  That's a ridiculous accusation, so you are
treated with ridicule for saying it.

Kris
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