Re: Some very basic questions

[Stephan von Krawczynski <skraw@ithnet.com>]

On Tue, 21 Oct 2008 13:15:13 -0400
Christoph Hellwig <hch@infradead.org> wrote:

> On Tue, Oct 21, 2008 at 07:01:36PM +0200, Stephan von Krawczynski wrote:
> > Sure, but what you say only reflects the ideal world. On a file service, you
> > never have that. In fact you do not even have good control about what is going
> > on. Lets say you have a setup that creates, reads and deletes files 24h a day
> > from numerous clients. At two o'clock in the morning some hd decides to
> > partially die. Files get created on it, fill data up to errors, get
> > deleted and another bunch of data arrives and yet again fs tries to allocate
> > the same dead areas. You loose a lot more data only because the fs did not map
> > out the already known dead blocks. Of course you would replace the dead drive
> > later on, but in the meantime you have a lot of fun.
> > In other words: give me a tool to freeze the world right at the time the
> > errors show up, or map out dead blocks (only because it is a lot easier).
> 
> When modern disks can't solve the problems with their internal driver
> remapping anymore you better replace it ASAP as it is a very strong
> disk failure indication.  Last years FAST has some very interesting
> statitics showing this in the field.

And of course a "disk" is always a "disk", right? 

-- 
Regards,
Stephan