From: pSeries AIX Geek (aixgeek@YAHOO.COM)
Date: Tue Dec 31 2002 - 15:12:38 EST
I guess that might be the case with older hardware
(and I think a B50 probably qualifies as older).
I guess AIX 5 is delivering some sort of firmware
update or something that modifies the NVRAM structure
(I think we saw this from AIX 4.1 to AIX 4.2, if I
remember right).
It could also be some sort of microcode-level thing.
In the interest of full disclosure -- I've done the
4.3->5.1/5.2 migration and back to 4.3 (at least once)
on a B80, H80/6H1, M80/6M1, S80/S85 without any
problems.
--- Adam Hanel <hanela@BILLINGS.K12.MT.US> wrote:
> This is also not completely true. I have a 7046-B50
> and after putting 5.1
> on it I could not go back to 4.3 or lower. The
> solution from IBM was to get
> a diagnostics disk, completely erase the hard
> drives, and remove the
> internal battery to drain the NVRAM. Otherwise 4.3
> or lower wouldn't work.
>
>
>
> -----Original Message-----
> From: IBM AIX Discussion List
> [mailto:aix-l@Princeton.EDU] On Behalf Of
> pSeries AIX Geek
> Sent: Saturday, December 28, 2002 11:46 AM
> To: aix-l@Princeton.EDU
> Subject: Re: AIX 5.2 back to 4.3.3 or lower
>
> If you had a box that supported AIX 4.3.3, then you
> should not have any problem going back to AIX 4.3.3,
> even if you installed AIX 5.2 at some point.
> There's
> nothing in the OS that would "alter" the machine.
>
> What you CANNOT do is a "reverse migration"; i.e. go
> back automagically to your 4.3.3 setup in a fashion
> akin to rejecting an applied APAR. You have to
> reinstall AIX 4.3.3.
>
>
> --- Steve Chandler <schandler@APPLE.COM> wrote:
> > I cant answer your first question, but the 6228
> > cards were supported in
> > ML8 and above according to the announcement letter
> > of the 6228.
> >
> >
> > steve
> >
> > "Vincent D'Antonio, III" wrote:
> >
> > > Hoping everyone had some good time off........
> > >
> > > A co-worker was saying that if I put AIX 5.2 on
> > some boxes, not sure
> > > which ones, which I could not go back to 4.3.3.
> > Has anyone seen or
> > > heard this? I load the OS 5.1, 4.3.3 or even
> > 4.2.1 many times on the
> > > same box for testing, hence the reason I ask.
> > >
> > > Also at which ML level does AIX 4.3.3 support
> the
> > 6228 cards?
> > > Thanks
> > > Vince
>
>
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