Hi
My comments are below. {sorry no spell checker}
Ben Logan wrote:
> On Thu, May 09, 2002 at 11:10:48AM +0530, Ashwin Mansinghka wrote:
>
>>Hi All,
>>
>>I am in a situation.
>>
>>I have a PC with Celeron 500 Mhz processor and 128MB RAM. I have Redhat
>>7.2 installed (upgraded from 7.1 using the default Redhat Installer
>>provided with the CD - made form the ISO image from Redhat Site) on the
>>Hardisk.
>>
>>I need to take this Hard Disk (physically remove it from the present Box
>>as above) on a tour and use it on another BOX (configurations I do not
>>know apart from a assurance that it will be an intel processor machine -
>>the guys do not want to specify if Celeron or P-I or P-II or Coppermine or
>>x486 or x386 etc.)
>>
>>What precations do I need to take to ensure flawless operations and no
>>troubleshooting on the spot ?
>>
>
> I'm not positive, but I think that as long as you make sure that the
> hard disk remains in the same "position" on the bus, you will be ok.
> IOW, if it is hda in your machine, it should be hda in the other
> machine. It shouldn't matter if there are other disks in the machine,
> as long as your disk is where your configuration files expect it to
> be.
Yes, you must ensure your boot drive is on the proper IDE channel.
You should also make sure your drive is less than 8GB so you can
avoid some broken bios problems. Bring your custom boot floppy just
in case.
>
> Video card might be another problem if you are running X. Unless the
> machine has the same video card/monitor combo, you will probably have
> to do some configuring there. You could play it safe and configure
> your video card and monitor as either standard VGA (really safe) or
> standard SVGA (probably safe enough) before taking the disk out of
> your machine.
If you are running XFree86 >= 4.1 you may be OK, but make sure you
set you machine to startup at init level 3 {multiuser text with network}
not init level 5 {multiuser gdm with network}. You can "init 5" to start
up the gdm once you have run setup to configure the mouse, X and any
other items.
>
> Other than that, you should probably temporarily un-configure any
> hardware specific to your machine: ethernet cards, sound card(s), etc.
> That will save some ugly (but probably non-fatal) messages on boot.
If Kudzu is not disabled most hardware drivers can be changed when the
machine boots.
>
> Just thought of something else: if you have a special pointing device,
> you might change the configuration to be as generic as possible.
>
>
>>Sadly that place has no Internet connection and I won't be able to access
>>Internet or mail etc. for on spot troubleshooting.
>>
>>I am willing to upgrade to 7.3 if required. I have heard from a colleague
>>of mine (as a casual remark) about some tricky issues about "different
>>kernel images" for "different processors" which will make my life
>>miserable on tour. The colleague refuses (says does not know much) to
>>explain more.
>>
The safest kernel is configured as i386 with math emulation enabled.
Then anything 80386SX through P4/Athelon will run. Emulation is not
used even if enabled when a Floating Point Processor is found so you
can still get reasonable processor utilization even though it is not
optimized. Make sure to build all the modules from the kernel source
config file included in the src rpm.
>
> My understanding is that software compiled for an i686, for example,
> will run fine on an i386; it is just optimized for the i686. The
> kernel may be different, I don't know. I do know that if you were to
> use a kernel (or any other software) compiled for i386, you could run
> it on any later Intel-compatible processor without trouble.
>
Any software optomized for a more advanced CPU is forward compatible not
backward compatable. I686 software will not run on i586 but i386 with
emulation enabled will run on any intel {or compatable} processor with
or without an FPU.
>
>>Will my existing self written software work flawlessly too ?
>>
As long as it was not optimized for a more current processor than what
you are using. It might be a good idea to bring the source so you can
recompile it if you have to. Most RedHat software is compiled for i386
so you should be safe.
>
> I guess that depends on what the software does. :)
>
> Regards,
> Ben
>
>
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