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epretorious
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Joined: 04 Jul 2003
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Location: Truckee, CA
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 Posted: Tue Oct 25, 2005 4:36 am Post subject: Changing the system's motherboard: AMD -> Intel |
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'Just a quick sanity check: My Gentoo mail server's AMD motherboard died and my only option for replacement is an Intel motherboard.
It seems to me that recovery should be as simple as...
1. Remove & replace the motherboard (being careful to preserve the HDD-to-IDE relationships).
2. Boot the Gentoo Install CD and begin a basic installation:
a. Mount the HDD-partitions in /mnt/gentoo.
b. `chroot /mnt/gentoo /bin/bash; env-update; source /etc/profile;`
c. Configure /etc/make.conf (CHOST, CFLAGS, CXXFLAGS).
d. `emerge -e world`
3. Reconfigure the kernel (change CONFIG_MK7 to CONFIG_MPENTIUMIII) and re-build/re-install.
Could it really be that simple? All of the configuration files should be safe (CONFIG_PROTECT)... Right? 
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Eric P.
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kiksen
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Joined: 24 Jun 2002
Posts: 401
Location: Denmark
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| Posted: Tue Oct 25, 2005 5:56 am Post subject: |
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Hi.
I think you'll need to bootstrap it before emerge -e world, to make sure the toolchain is functional first. If you expand the line
emerge -e world
to
cd /usr/portage; scripts/bootstrap.sh; emerge -e system; emerge -e world
I think you'd be good to go.
Good luck 
/kiksen |
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Bob P
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Joined: 20 Oct 2004
Posts: 3355
Location: Jackass! Development Labs
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| Posted: Tue Oct 25, 2005 12:21 pm Post subject: |
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yes, it can be that simple. but if you're changing chost you could run into problems. i'd recommend this:
| Code: | emerge -e system
emerge -e system
emerge -e world
emerge -e world |
if you configure your kernel to provide backward compatability, you would not have to rebuild it. similarly, by using an appropriate combination of march and mtune, you could avoid having to rebuild anything next time.
for my servers, for example, i build everything with backward compatability to pentium. doing so eliminates the kind of problems you're having.
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nixnut
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| Posted: Tue Oct 25, 2005 3:21 pm Post subject: |
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| Bob P wrote: | yes, it can be that simple. but if you're changing chost you could run into problems. i'd recommend this:
| Code: | emerge -e system
emerge -e system
emerge -e world
emerge -e world |
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Reinstalling from scratch would be faster actually. Just backup your configuration files and restore them later.
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Bob P
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| Posted: Tue Oct 25, 2005 4:02 pm Post subject: |
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yeah, that could take a long time. reinstallation may ultimately be quicker, but it requires interactive input on your part. in contrast, brute strengh recompiling on a fast machine that doesn't require user input may ultimately involve less of your time. which choice is most efficient depends on the user. my only reason for suggesting the lengthy approach was to keep him from running into problems caused by static library retention if he decides to use the recompilation approach.
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epretorious
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Joined: 04 Jul 2003
Posts: 191
Location: Truckee, CA
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| Posted: Tue Oct 25, 2005 7:35 pm Post subject: |
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| Bob P wrote: | | yeah, that could take a long time. reinstallation may ultimately be quicker, but it requires interactive input on your part. in contrast, brute strengh recompiling on a fast machine that doesn't require user input may ultimately involve less of your time. |
My first priority is to maintain the configuration & data of the system (e.g., mail queued for delivery, databases, passwords, etc.), hence, the appeal of re-compiling the system in-place.
| Bob P wrote: | | my only reason for suggesting the lengthy approach was to keep him from running into problems caused by static library retention if he decides to use the recompilation approach. |
I've started down the path prescribed by kiksen:
| Quote: | 1. Remove & replace the motherboard (being careful to preserve the HDD-to-IDE relationships).
2. Boot the Gentoo Install CD and begin a basic installation:
a. Mount the HDD-partitions in /mnt/gentoo.
b. `chroot /mnt/gentoo /bin/bash; env-update; source /etc/profile;`
c. Configure /etc/make.conf (CHOST, CFLAGS, CXXFLAGS).
d. `cd /usr/portage/; ./scripts/bootstrap.sh`
e. `emerge -e system` <== completed and paused
f. `emerge -e world`
3. Reconfigure the kernel (change CONFIG_MK7 to CONFIG_MPENTIUMIII) and re-build/re-install. |
Should I really `emerge -e system` twice before moving-on to the final `emerge -e world`? (This is a fairly slow system so it's taken approx. 10 hours just to get this far.)
| Bob P wrote: | | Code: | emerge -e system
emerge -e system
emerge -e world
emerge -e world |
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Thanks for all your help Bob, Kiksen, and Nixnut. 
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Eric P.
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Bob P
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kiksen
Guru
Joined: 24 Jun 2002
Posts: 401
Location: Denmark
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| Posted: Wed Oct 26, 2005 6:44 pm Post subject: |
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I don't think you have to emerge -e system twice when you have already bootstapped your system, but I might be wrong. Good luck anyway
/kiksen |
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epretorious
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| Posted: Sat Oct 29, 2005 1:56 am Post subject: |
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Just to be on the safe side I emerge'd system twice, emerge'd world once, and then rebuilt the kernel and re-ran lilo. Everything seems to work just fine! <knock on wood!> 
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Eric P.
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Aynjell
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Joined: 28 Jun 2004
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| Posted: Sat Oct 29, 2005 2:54 am Post subject: |
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Um...
No?
I'd think that changing mobo's and CPU's (providing both have similar instruction sets (if the intel chip has more, it's fine)) would make you just have to recompile the kernel. What am I missing here?
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epretorious
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| Posted: Sat Oct 29, 2005 5:53 am Post subject: |
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| Aynjell wrote: | | I'd think that changing mobo's and CPU's (providing both have similar instruction sets (if the intel chip has more, it's fine)) would make you just have to recompile the kernel. What am I missing here? |
The two processors (AMD Duron and Intel Celeron2) have different CFLAGS. Seems like reason enough to me to recompile. 
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Eric P.
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Aynjell
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| Posted: Sat Oct 29, 2005 5:58 am Post subject: |
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Yes, it does. I just didn't think it was diehard required. Seems like the celeron was a step up, wasn't it?
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Installing Gentoo
