Install now, upgrade later?

[ekul taylor]

The 32/64 bit question is very complicated.  Hopefully I can help.

Any AMD Opteron or Intel Xeon server made in the past few years has support
for running 32 bit and 64 bit code (even at the same time).  So you could
clone your existing server and it would work fine but you might not be able
to take advantage of all of your RAM.

If you have more then 4 GB of RAM you have 3 options to use it all:

1. Clone your 32 bit server install but install the linux-server package if
it isn't already used.  This kernel is PAE enabled which is something Intel
developed to let 32 bit processors address more then 4 GB of RAM.  It does
have slight performance issues and no one process can address more then 4 GB
of RAM but for a terminal server this isn't important.

2.  Clone your 32 bit server but install and run a 64 bit kernel.  This can
be tricky dependency-wise so I wouldn't recommend it so I won't outline the
many steps here.

3.  Install a 64 bit version of edubuntu and reuse your configuration files
from your old server.  It's pretty easy to do since except for
/etc/modules.d and /etc/modprobe.conf none of the config files are about the
kernel.  You do have to build your chroot a little differently if you use
this option as thin clients will almost certainly need a 32 bit boot
environment.  To do this you use the command:
ltsp-build-client --arch i386
instead of just ltsp-build-client.  This is what I option I would use when
installing lucid but if you're just going to be using karmic for a few
months option 1 will involve the least setup.


On Fri, Mar 19, 2010 at 9:11 AM, David Groos <djgroos at gmail.com> wrote:

> Confusion compounds...
>
> the one thing I might have understood...
>
>>
>> If you install this kernel in Jaunty/Karmic, then you can access more
>> than 4 Gb of RAM while having 32 bit systems/OS:
>> http://packages.ubuntu.com/karmic/linux-server
>>
>> So you can do that either in the old or the new server.
>>
>
> You're saying that:
> --I could install the above kernel onto my current 32 bit hardware.
> --then I could either:
> --------install up to 64 Gb RAM on old server
>                       or...
> --------then I could clone this new setup to the new server.
> ?
>
> Thanks,
> David
>
>
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