topic Re: dual boot in Operating System - HP-UX

dual boot

John Wright — Mon, 03 Sep 2001 10:10:47 GMT

I have a 715 running 10.20 on an 18GB disk. I have another disk (1GB) that I would like to install 11.00 on giving me the opportunity to boot into 10.20 or 11.00. However disk2 isn't big enough to take all my applications. So can I add disk2 to my existing volume group and then install 11.00 onto it allowing me to grow 11.00 applications onto disk1 ?
I hope that's clear - two disks each bootable but in the same volume group.

Thanks

Re: dual boot

Ravi_8 — Mon, 03 Sep 2001 10:50:56 GMT

Hi,
your idea wouldn't work. u can't have the 2 os's on the same disk. whereas u can install os on each disks and can use one at a time.
if u wanted 2 more os running at the same time then opt for superdome which is very costly.
but you present idea of adding 1GB disk to 18G disk and installing 2 os wouldn't work. if you did so you end up with loosing the previous os.

Re: dual boot

Marcin Wicinski — Mon, 03 Sep 2001 11:02:36 GMT

Hi John,

It's impossible to build two OS on one phisical disk. There is no oportunity to build two OS on the same vg also. There is no similarity between solutions under HP-UX and disk partitions under DOS or Windows.

Later,

Re: dual boot

Patrick Wallek — Mon, 03 Sep 2001 17:59:37 GMT

What you are proposing won't work. If you installed 11.0 on the 1GB disk and then wanted to extend that VG to include the 18GB disk, you would lose your 10.20 OS on the 18GB disk.

I think the easiest thing would be to acquire another 18GB disk for your system to install 11.0 onto. I wouldn't even try to install 11.0 onto anything smaller than a 4GB disk. I would personally advise at least a 9GB.

Re: dual boot

Sridhar Bhaskarla — Mon, 03 Sep 2001 18:17:40 GMT

John,

It's not possible to configure two different boot disks together in one volume group. However, if you have a 2 GB disk, you can install 11.0 on it and import the 10.20 volume group and mount the file systems of it. After mounting, keep an fstab file with only the application file systems in it as you don't need 10.20 root file systems. This way you can work on both 10.20 and 11.0 whenever you want.

It's bit difficult to allot space on 2 GB disk using LVM. SO, you may need to select whole disk - HFS option while installing the OS.

-Sri

Re: dual boot

Sanjay_6 — Tue, 04 Sep 2001 16:55:26 GMT

Hi,

Like the others have told you, you cannot share the same disk (18GB) between two OS. The only choice is to use a higher capacity disk in place of the 1GB disk and load 11.0 on that.

Thanks

Re: dual boot

Joseph C. Denman — Tue, 04 Sep 2001 17:10:24 GMT

Hey guys,

On the 11.0 disk (1GB), could he not import the vg from the 18G disk as vg01? Then mount his applications filesystem?

Just a thought...???

...jcd...

Re: dual boot

Patrick Wallek — Tue, 04 Sep 2001 17:22:02 GMT

Yes, he could probably import his 10.20 vg00 disk as vg01 on the 11.0 system. The problem is there will be a real problem installing 11.0 on a 1GB disk. The HP-UX 11.0 Installation and Update Guide says a MINIMUM of a 2 GB root disk is required.

Re: dual boot

Joseph C. Denman — Tue, 04 Sep 2001 17:44:26 GMT

Yes, but I think...bare bones...he could get it loaded.

John, if this is something you really wanted to do, you could give it a try. It might me fun playing around with this but I would really look into getting another disk.

...jcd...

Re: dual boot

John Wright — Tue, 04 Sep 2001 17:58:08 GMT

Guys,
Thanks for the help. I did install a minimum 11.00 system on the 1GB disk and then imported the 18GB disk as vg01. I then had to transfer /opt to the 18GB disk but I can now boot both systems.

John