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Date: Wed, 20 Jan 2010 12:54:16 +0100
Message-ID: <2ea1731b1001200354t5ed29458h6fc98c49c1a555d5@mail.gmail.com>
Subject: Re: mount ramdisk rootfs /etc directory to jffs2 filesystem.
From: Marco Stornelli <marco.stornelli@gmail.com>
To: Matthias Kaehlcke <matthias@kaehlcke.net>
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Cc: Ricard Wanderlof <ricard.wanderlof@axis.com>,
	"linux-embedded@vger.kernel.org" <linux-embedded@vger.kernel.org>,
	kernelnewbies <kernelnewbies@nl.linux.org>,
	Johnny Hung <johnny.hacking@gmail.com>,
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2010/1/20 Matthias Kaehlcke <matthias@kaehlcke.net>:
> 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.
>

I don't know the size constraints of Johnny, so it can be useful to use jffs2.

Marco