> Hi Paolo,
>
> Friday, November 03, 2000, 12:27:40 PM, you wrote:
>
> PM> Just a little newbie question: in order to achieve speed and a good robustness
>of an embedded system, in order to let user to switch off without a shutdown
>procedure and avoiding those bad
> PM> filesystem checks ), should I load everything on a Ramdisk? Any hints about it ?
>
> when i was confronted with that problem, i decided to mount the
> filesystem read-only. all the parts of the filesystem which need to be
> writable at runtime are linked to ramdisk filesystems (like the /tmp,
> /var/... and the /dev directories). in a linux how-to or faq i found a
> hint by which means you can prevent the fcheck program of checking
> your disks. i don't remember at the moment but i will dig through my
> notes if you are interested in it ...
>
some posible solutions to that problem ,
1) use reiserfs in the system (the exeption is /boot but that can be readonly)
reiserfs is stable enough to manage such crash situation (you could also
try ext3, but I can't say anything about ext3 realy since I did not play
with it yet).
http://www.reiserfs.org (not shure on this one, but it shouls be in the
kernent kernels/releases anyway)
2) if you need to do something realy crule then you might consider using a
ramdisk-based minisystem for testing . Ramdisk based systems don't even
need access to the boot-media during runtime and on a crash/power-down
the ramdisk is lost but that does not influence the boot-media.
http://www.rtlinux.org/minirtl.html
3) get a network card with an boot-rom on it and boot via DHCP/BOOTP mount
everything including / via NFS , so if you crash the box it will not corupt
any filesystems aslong as you did not try to write anything to them, and
there is naturally no fsck with such a setup.
/usr/doc/howto/Diskless-HOWTO
4) write output and debug info to a remote site, ither via syslog/syslog-server
or via an NFS mounted data-partition, and have everything local mounted
read-only.
man syslogd
5) Consider using Carbon-kernel for developement/debuging
http://www.carbonkernel.org
6) only write perfect, bugfree code :)
hofrat
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