Hi there,

may be a stupid question but sometime's You have no ideas at all.

The problem is that we plan to upgrade a 6H1 from one to two proc's. Got
a new processor board. OS is still 4.3.3. The downtime should be as
short as possible. As far as I know the OS won't boot after the upgrade
because of the uniprocessor kernel installed. On the other hand, I know
no way to install a multiprocessor kernel prior to the upgrade.

The only way I worked out for doing the upgrade is to mksysb the machine
and resore it afterwards.

Does anyone know a way of more elegance?

Patrick

"Patrick" <rhodan_nospam_5625@freenet.de> schrieb im Newsbeitrag
news:bumrc1$v0f$1@online.de...
> Hi there,
>
> may be a stupid question but sometime's You have no ideas at all.
>
> The problem is that we plan to upgrade a 6H1 from one to two proc's. Got
> a new processor board. OS is still 4.3.3. The downtime should be as
> short as possible. As far as I know the OS won't boot after the upgrade
> because of the uniprocessor kernel installed. On the other hand, I know
> no way to install a multiprocessor kernel prior to the upgrade.
>
> The only way I worked out for doing the upgrade is to mksysb the machine
> and resore it afterwards.
>
> Does anyone know a way of more elegance?
>
> Patrick

Hallo Patrick,

actually it is a good idea to install mp kernel even if you just use one cpu
to ease upgrading. Performance differences with single cpu can be neglected.
Anyway this is a rather simple task with AIX, you just need to change two
links from unix to unix_mp before exchanging the board:
# ln -sf /usr/lib/boot/unix_mp /unix
# ln -sf /usr/lib/boot/unix_mp /usr/lib/boot/unix
# bosboot -ad /dev/ipldevice
# shutdown -r

HTH,
Andreas

"Andreas Schulze" <b79xan@gmx.de> wrote in message
news:bunsn2$9ml9@news-1.bank.dresdner.net...
> "Patrick" <rhodan_nospam_5625@freenet.de> schrieb im Newsbeitrag
> news:bumrc1$v0f$1@online.de...
> > Hi there,
> >
> > may be a stupid question but sometime's You have no ideas at all.
> >
> > The problem is that we plan to upgrade a 6H1 from one to two proc's. Got
> > a new processor board. OS is still 4.3.3. The downtime should be as
> > short as possible. As far as I know the OS won't boot after the upgrade
> > because of the uniprocessor kernel installed. On the other hand, I know
> > no way to install a multiprocessor kernel prior to the upgrade.
> >
> > The only way I worked out for doing the upgrade is to mksysb the machine
> > and resore it afterwards.
> >
> > Does anyone know a way of more elegance?
> >
> > Patrick
>
> Hallo Patrick,
>
> actually it is a good idea to install mp kernel even if you just use one
cpu
> to ease upgrading. Performance differences with single cpu can be
neglected.
> Anyway this is a rather simple task with AIX, you just need to change two
> links from unix to unix_mp before exchanging the board:
> # ln -sf /usr/lib/boot/unix_mp /unix
> # ln -sf /usr/lib/boot/unix_mp /usr/lib/boot/unix
> # bosboot -ad /dev/ipldevice
> # shutdown -r


After making sure you have bos.mp installed...

Patrick <rhodan_nospam_5625@freenet.de> wrote in message news:<bumrc1$v0f$1@online.de>...
> Hi there,
>
> may be a stupid question but sometime's You have no ideas at all.
>
> The problem is that we plan to upgrade a 6H1 from one to two proc's. Got
> a new processor board. OS is still 4.3.3. The downtime should be as
> short as possible. As far as I know the OS won't boot after the upgrade
> because of the uniprocessor kernel installed. On the other hand, I know
> no way to install a multiprocessor kernel prior to the upgrade.
>
> The only way I worked out for doing the upgrade is to mksysb the machine
> and resore it afterwards.
>
> Does anyone know a way of more elegance?
>
> Patrick

I'm sure the box will still boot with 2 processsors. You will just
need to install bos.mp either before or after the upgrade, then you
need to link /unix to usr/lib/boot/unix_mp, run bosboot, reboot and
you should be using both processors.

Steve

"Andreas Schulze" <b79xan@gmx.de> wrote in message news:<bunsn2$9ml9@news-1.bank.dresdner.net>...
> "Patrick" <rhodan_nospam_5625@freenet.de> schrieb im Newsbeitrag
> news:bumrc1$v0f$1@online.de...
> > Hi there,
> >
> > may be a stupid question but sometime's You have no ideas at all.
> >
> > The problem is that we plan to upgrade a 6H1 from one to two proc's. Got
> > a new processor board. OS is still 4.3.3. The downtime should be as
> > short as possible. As far as I know the OS won't boot after the upgrade
> > because of the uniprocessor kernel installed. On the other hand, I know
> > no way to install a multiprocessor kernel prior to the upgrade.
> >
> > The only way I worked out for doing the upgrade is to mksysb the machine
> > and resore it afterwards.
> >
> > Does anyone know a way of more elegance?
> >
> > Patrick
>
> Hallo Patrick,
>
> actually it is a good idea to install mp kernel even if you just use one cpu
> to ease upgrading. Performance differences with single cpu can be neglected.
> Anyway this is a rather simple task with AIX, you just need to change two
> links from unix to unix_mp before exchanging the board:
> # ln -sf /usr/lib/boot/unix_mp /unix
> # ln -sf /usr/lib/boot/unix_mp /usr/lib/boot/unix
> # bosboot -ad /dev/ipldevice
> # shutdown -r
>
> HTH,
> Andreas

AIX will install a mp kernel if the machine can be configured with
multiple cpu's even if the machine only has 1 cpu at install time.
You can verify this by looking at the links Andeas gave, they should
already point to the mp kernel.

Regards,
Ron.

Hi there,

thanks for the help. You are right, the mp kernel is already linked.
But, once I tried to restore the system from a mksysb tape to a mp
machine and that didn't work. Using the CD was successful. I thougt that
was because of the wrong kernel in the boot session of the tape.
Restoring to a uniprocessor machine worked directly from tape ?!?

OK, we will install the board and see what happens ;-)

Patrick

Ron Visser wrote:

> "Andreas Schulze" <b79xan@gmx.de> wrote in message news:<bunsn2$9ml9@news-1.bank.dresdner.net>...
>
>>"Patrick" <rhodan_nospam_5625@freenet.de> schrieb im Newsbeitrag
>>news:bumrc1$v0f$1@online.de...
>>
>>>Hi there,
>>>
>>>may be a stupid question but sometime's You have no ideas at all.
>>>
>>>The problem is that we plan to upgrade a 6H1 from one to two proc's. Got
>>>a new processor board. OS is still 4.3.3. The downtime should be as
>>>short as possible. As far as I know the OS won't boot after the upgrade
>>>because of the uniprocessor kernel installed. On the other hand, I know
>>>no way to install a multiprocessor kernel prior to the upgrade.
>>>
>>>The only way I worked out for doing the upgrade is to mksysb the machine
>>> and resore it afterwards.
>>>
>>>Does anyone know a way of more elegance?
>>>
>>>Patrick
>>
>>Hallo Patrick,
>>
>>actually it is a good idea to install mp kernel even if you just use one cpu
>>to ease upgrading. Performance differences with single cpu can be neglected.
>>Anyway this is a rather simple task with AIX, you just need to change two
>>links from unix to unix_mp before exchanging the board:
>># ln -sf /usr/lib/boot/unix_mp /unix
>># ln -sf /usr/lib/boot/unix_mp /usr/lib/boot/unix
>># bosboot -ad /dev/ipldevice
>># shutdown -r
>>
>>HTH,
>>Andreas
>
>
> AIX will install a mp kernel if the machine can be configured with
> multiple cpu's even if the machine only has 1 cpu at install time.
> You can verify this by looking at the links Andeas gave, they should
> already point to the mp kernel.
>
> Regards,
> Ron.