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Moving 32bit to 64bits keeping old one on same hdd
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mahdi1234
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PostPosted: Fri Jan 12, 2018 7:29 pm    Post subject: Moving 32bit to 64bits keeping old one on same hdd Reply with quote

Hi,

I am thinking about upgrading from 32bit to 64bit gentoo installation and had idea about resizing one of the existing partitions and install 64bit on this space so I would have

/dev/sda1 - boot (used for both archs)
/dev/sda2 - current 32bits
/dev/sda3 - new 64bit install from Gentoo DVD
..
/dev/sda6 - swap (used for both archs)

Then I would

- copy over .config from kernel, enable 64bits and re-compile, re-boot
- copy over make.conf with local overlays
- copy over world file
- copy over /etc (and adjust package.keywords arch)
- copy over ~ (or maybe just selected folders like .mozilla)

Compile everything.

Did I miss something to have identical 64bit system to my existing 32bit? Is there better way to achieve this?
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eccerr0r
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PostPosted: Fri Jan 12, 2018 9:51 pm    Post subject: Reply with quote

Definitely need to watch your kernel config carefully, a lot of the x86 options may not translate over to amd64 options.

I might need to straight copy my 32-bit install and dump a 64-bit stage3 over it minus world and make.conf and start from there. I have too many customizations that it will be tough to convert to 64-bit, mostly webserver and other services I setup on it... *sigh*

Maybe it'd be easier for me to just to dig out an old computer that's not susceptible to spectre/meltdown...
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krinn
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PostPosted: Sat Jan 13, 2018 12:43 pm    Post subject: Reply with quote

you could have a common /home form sda2 with sda3 as home, you just need to mount sda2 somewhere, and bind /sda2/home to /home
ie:
Code:
/dev/sda2                                  /somewhere_on_sda3          fstype      noatime   0 0
/somewhere_on_sda3/home   /home      none   bind

Because of this, you also don't need to copy local overlay, but set local overlay to /somewhere_on_sda3/usr/local/portage, or bind /somwhere_on_sda3/usr/local/portage with /usr/local/portage
Same for everything that could be common: either bind /somewhere_on_sda2/usr/portage with /usr/portage, or set PORTDIR="/somwhere_on_sda2/usr/portage", however do not forget to set PKGDIR because it will be really a bad idea to use /usr/portage/packages to hold binaries for 32 and 64bits.

Or if you don't feel "secure" to have /sda2 mount somewhere on sda3, you could create another partition, move /sda2/home content to it, and use that partition as /home on your 32 and 64bits.
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mahdi1234
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PostPosted: Wed Jan 17, 2018 7:57 pm    Post subject: Reply with quote

Thanks guys, since I'm sick in the bed I went ahead and have now working 64bits system (well not completely, but most thing do work). It was easier/faster than I expected and I still have 32bits on hand in case...
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