Re: [MLUG - DISCUSSION] "missing" files after hard crash or power failure

[George Robb <EMAIL:PROTECTED>]

There is a package for playing with the cache / drive parameters in  
general...  hdparm

http://freshmeat.net/projects/hdparm/

http://www.linuxdevcenter.com/pub/a/linux/2000/06/29/hdparm.html

A simple hdparm /dev/<your drive here (not partition)>  will tell the  
current parameters.

Good point that if there is a large cache on the drives or if they  
are on a RAID controller there could be some serious data floating in  
cache.

;)

George



On Apr 2, 2007, at 1:55 PM, Stephen Montgomery-Smith wrote:

> Mark Rages wrote:
> > On 4/2/07, shawn parker <EMAIL:PROTECTED> wrote:
> > > checked lost+found thinking that could be the issue. empty.
> >
> > My intuition is that a bogus script is going through and deleting
> > things.  ext2 is a very, very well tested filesystem.   And I'm not
> > able to think of a failure mode that would unlink all normal files.
>
> But I have heard of problems, where even if the filesystem is  
> extremely well tested and effective, that the hard drive itself  
> caches data.  Then the OS is helpless.
>
> I have had similar bad experiences with the UFS+softupdates  
> filesystem that comes with BSD, which I am sure is caused by hard  
> drive cache that the software cannot flush.
>
>
> Anyway, with ext2, cannot it be operated in either sync or async  
> mode, and async is much faster, but much less forgiving of hardware  
> failures?
>
> Stephen
>
>
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