On Mon, Nov 27, 2006 at 11:14:54PM -0000, chentom60 wrote:
> Hello,
>
> After 7250 boots up, I am using "loadUSBModules.sh" and "loadUSB.sh" to
> chroot to USB file system. I am wondering what is the difference
> between this method and using RamDisk to boot to a mini file system
> first then pivot root to USB? Are they virtually same thing?
Let me give you another scenerio which might make a good example. I have a
bootable linux CD, aka Timos rescue disk, which I can use on a regular Intel PC.
When it starts it says "do you want to (a) run from CD, or (b) load the whole
O/S into RAM." If I run from CD when I issue commands it hunts the CD for the
executables, but if I load it all into RAM, I can remove the CD, and the whole
O/S runs from RAM. The first case requires the CD, but not much RAM. The
second case requires the CD only long enough to load an image into RAM, then it
takes a lot of RAM.
Once you chroot to something else, you end up in the place you chroot'ed to, and
it matters little how you got there, so you might say it is virtually the same
thing. One other difference is that you have to take deliberate steps to free
up the RAM you tied up with the RamDisk. I presume TSlinux does this for you.
>
> Is using USB,CF drive a safe way to work around the limitation of on
> board flash memory?
>
On my TS-7200 I routinely use a CF card as my main disk instead of the the tiny
onboard flash because I want a full featured O/S like I have on my PC. For
safety I use ext3 and mount read-only during "production" (aka when user will
cycle power at will). I've never had any issues.
Hope that helps.
Joe
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