From mboxrd@z Thu Jan  1 00:00:00 1970
From: Matthias Kaehlcke <matthias@kaehlcke.net>
Subject: Re: mount ramdisk rootfs /etc directory to jffs2 filesystem.
Date: Wed, 20 Jan 2010 11:21:45 +0100
Message-ID: <20100120102145.GV16182@darwin>
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To: Marco Stornelli <marco.stornelli@gmail.com>
Cc: Johnny Hung <johnny.hacking@gmail.com>, Ricard Wanderlof <ricard.wanderlof@axis.com>, kernelnewbies <kernelnewbies@nl.linux.org>, "linux-mtd@lists.infradead.org" <linux-mtd@lists.infradead.org>, "linuxppc-dev@lists.ozlabs.org" <linuxppc-dev@lists.ozlabs.org>, "linux-embedded@vger.kernel.org" <linux-embedded@vger.kernel.org>

El Wed, Jan 20, 2010 at 08:57:44AM +0100 Marco Stornelli ha dit:

> 2010/1/20 Johnny Hung <johnny.hacking@gmail.com>:
> > 2010/1/19 Matthias Kaehlcke <matthias@kaehlcke.net>:
> >> El Tue, Jan 19, 2010 at 02:17:22PM +0100 Ricard Wanderlof ha dit:
> >>
> > I consider to use ramdisk as rootfs because worry about wrong
> > operation in rootfs (is use jffs2 rootfs) and it will cause system
> > boot up failed.
> > Another query, does the syslogd/klogd log files also store in jffs2
> > rootfs? Write to jffs2 frequently will reduce flash life cycle.
> >
> > BRs, H. Johnny
> >>
> >> --
> 
> In general a good splitting for rootfs could be: squashfs for rootfs,
> tmpfs for volatile data (/tmp), ubifs (with a flash partition) for
> "strong" permanent data (/etc, ....) and pramfs for "light" permanent
> data (/var/log, .....).

if ubifs is a good choice depends on the size of the partition, iirc
it has a significant overhead for very small partitions.

once using ubi it could be interesting to set up the read-only rootfs
partition upon ubi in order to spread the wear out over a maximum of blocks.

-- 
Matthias Kaehlcke
Embedded Linux Developer
Barcelona

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