linux-kernel - Re: jffs2 and kernel config for SDHC Memory Cards

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Message-ID: <20090310112355.GF1337@ucw.cz>
Date:	Tue, 10 Mar 2009 12:23:55 +0100
From:	Pavel Machek <pavel@....cz>
To:	Thanasis <thanasis@...r.hopto.org>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: jffs2 and kernel config for SDHC Memory Cards

On Sat 2009-03-07 18:59:28, Thanasis wrote:
> on 03/07/2009 12:57 AM Sitsofe Wheeler wrote the following:
> > On Fri, Mar 06, 2009 at 10:24:25PM +0200, Thanasis wrote:
> >> on 03/06/2009 08:24 PM Sitsofe Wheeler wrote the following:
> >>> On Fri, Mar 06, 2009 at 03:56:01PM +0200, Thanasis wrote:
> >>>> on 03/06/2009 03:39 PM Thanasis wrote the following:
> >>>>> I want to use two of these Transcend?s Class 6 SDHC (SD High-Capacity)
> >>>>> Memory Cards,
> >>>>> http://www.transcendusa.com/Products/ModDetail.asp?ModNo=147&LangNo=0&Func1No=1&Func2No=13
> >>>>> as part of the filesystem in a netbook (Acer A110L), will mount /home on
> >>>>> one, and /tmp and /var on the other.
> >>>  
> >>>> Let me rephrase my questions in order to be clearer:
> >>>> Q1: In order to achieve wear leveling should I format them as jffs2?
> >>> This probably won't be very effective as you are already past the
> > 
> >> OK. I believe I should stick to ext2, right?
> > 
> > If you mean compared to jffs2 then probably yes, better to stick with
> > ext2. 
> Right, that is what I meant.
> 
> If you mean is ext2 the best choice over anything else... well
> > that's an open question (or so I'm told). You would need to ask a
> > filesystem expert really but it apparently depends on the workload, the
> > characteristics of the "disks" and whether you need journaling.
> It is going to be a desktop (netbook) system, so, if it had a HDD, I
> would opt for ext4 or xfs, but given the hardware (SDHC), I guess ext2
> is the best choice.

Well, maybe  ext2 is _best_ choice, but it is not good one. It will
loose data on sudden powerdowns...

See

(english) http://www.livejournal.com/~pavelmachek

entry 'evil little cards'.

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