[Gllug] Re: RAID on laptop or xfs?

[Liam Smit]

Yup drives do tend to do perform lots of black magic behind the ATA
interface, not a lot you can do about that except make sure it won' t
cause problems.

Buy a UPS? That's what we'd do back home. <g>

I'm not sure how much hdd corruption you will suffer if you are using
a journalling file system when the drive loses power, all changes to
files being stored in the journal.

If some of that cache is for reads (i.e. not stuff waiting to be
written) than you can ignore that for data corruption purposes.
Combining these two factors means you should survive. Of course if you
can' t take that kind of a risk then you should be using high end
controllers with battery backed cache and have everything on a UPS.

Regards
Liam     


On Fri, 01 Apr 2005 00:52:28 +0100, Nix <nix at esperi.org.uk> wrote:
> On Thu, 31 Mar 2005, Russell Howe uttered the following:
> > Even worse, some drives *IGNORE* a request to disable write caching! In
> > this case, there isn't a whole lot the filesystem can do other than take
> > a guess at the state of the drive (although I think I read something on
> > the linux-xfs list talking about cache barriers or something...).
> 
> A lost cause, if you ask me: if a drive's so loony nonstandard as to
> ignore cache disable requests, why on earth would it respect the (much
> less frequently implemented) cache barrier ops?
> 
> -- 
> This is like system("/usr/funky/bin/perl -e 'exec sleep 1'");
>    --- Peter da Silva
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