Subject: Re: mode data=journal in ext3. Is it safe to use?
From: Petter Larsen <pla@morecom.no>
To: Ken Ryan <linuxryan@leesburg-geeks.org>
Cc: linux-kernel@vger.kernel.org
In-Reply-To: <40D1B110.7020409@leesburg-geeks.org>
References: <40D1B110.7020409@leesburg-geeks.org>
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Date: Sat, 19 Jun 2004 16:49:35 +0200
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> > 
> > We are using ext3 on a compact flash disk in an embedded device. So we
> > are not using RAID systems.
> 

> Um, is this a new application or have you done this before?
> 
> It's my understanding that very few (or no) CF devices do wear-levelling internally.
> Using a journal, especially a true data journal, seems like *the* way to wear out your
> flash as quickly as possible.
> 
> If you've had success using ext2 in read/write mode on flash/CF in a shipping product,
> I for one would like to know more details!
> 
> 		ken

>From our data sheet:

    Wear Leveling is an intrinsic part of the operation of 	
    SanDisk products using NAND memory.

But for sure, we will use a Compact flash that DO wear leveling, and
also shuffling read-only data around the Compact Flash disk.

This will be for production, yes.

Petter
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