Re: Have ext3 on SanDisk CF but can't disable write-back caching as kernel instructs

From: Edward Lee epl (me_at_linnix.com)
Date: 07/18/03 

Date: 17 Jul 2003 17:23:22 -0700

usenet@harkless.org (Dan Harkless) wrote in message news:<4189894b.0307161533.17ae54ff@posting.google.com>...
> Bernhard Roessmann <roessmann@gmx.net> wrote in message
> news:<bem328$6jri3$1@ID-49938.news.uni-berlin.de>:
> > > Our device may lose power at any time, but it's very important we
> > > don't corrupt our data or our filesystem metadata, so our filesystems
> > > (except our initrd-based root filesystem) are ext3, mounted
> > > 'data=journal'.
> >
> > I don't think that it is a good idea to use ext3 on a CF.
> > ext3 does MANY writes to the journal, so the CF will possibly wear out
> > very soon.
>
> Forgot to address this in my previous reply -- when you say "MANY",
> are you saying an ext3 filesystem on CF will get written to on the
> order of 2-3x as much as an ext2 filesystem would get written to? Or
> are you saying it'll get written to an order of magnitude more?
>
> If not the latter, I don't think we care. Our preliminary ad-hoc
> calculations based on how we *hope* the SanDisk wear-leveling works
> (today I was told they'll supposedly be getting back to us within a
> week with details on that) showed the CF ought to last in the
> thousands of years.

Are they willing to put it in writing?

CFs are rated for approx. 100,000 write cycles. It will last
thousands of years only if you write once a day.

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