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 Post subject: dual-booting AIX and CRUX on a single disk?
PostPosted: 22 Sep 2010, 02:50 
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Joined: 22 Sep 2010, 01:51
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Hi all, I read CRUX supports jfs filesystems.
Is it possible to dual boot AIX and CRUX on a single disk?


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 Post subject: Re: dual-booting AIX and CRUX on a single disk?
PostPosted: 22 Sep 2010, 17:53 
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Joined: 17 Dec 2005, 14:31
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please, machine model?

anyway yes,
CRUX PPC bootkernels have JFS support built-in and jfsutils available.
I don't have experience with AIX but i suppose to have a dual boot on a single disk you'd be obliged, e.g., to boot your preferred OS directly from the OF prompt instead from SMS.


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 Post subject: Re: dual-booting AIX and CRUX on a single disk?
PostPosted: 22 Sep 2010, 18:11 
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Joined: 01 Apr 2010, 08:09
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i've the same question.
I also think the best way is to use a disk for each operating system and use SMS to boot the preferred one.

I'm not sure but yaboot isn't able to boot AIX (there is no jfs support too), is it right?
Today i sent an email, asking help, on yaboot-user ml.


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 Post subject: Re: dual-booting AIX and CRUX on a single disk?
PostPosted: 23 Sep 2010, 06:22 
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Joined: 22 Sep 2010, 01:51
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acrux wrote:
please, machine model?

anyway yes,
CRUX PPC bootkernels have JFS support built-in and jfsutils available.
I don't have experience with AIX but i suppose to have a dual boot on a single disk you'd be obliged, e.g., to boot your preferred OS directly from the OF prompt instead from SMS.


9114-275 with gxt4500p

can jfs exist without a volume group?... like under aix you can specify a different boot volume. If I created a new JFS filesystem within AIX's rootvg, will the installer be able to select the JFS filesystem as the install FS?

Having read a little more about CRUX, it seems it requires a special ppc /boot partition?
I cant think how one would manage switching between the AIX and CRUX boot loaders on the same disk... maybe something completely new?

Anyhow... I'll look around for a few more disks to play with...

I'll take a look at the Open Firmware options to see if I can change the boot LV from there.


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 Post subject: Re: dual-booting AIX and CRUX on a single disk?
PostPosted: 23 Sep 2010, 23:51 
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Joined: 17 Dec 2005, 14:31
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AIX's JFS can be mounted on Linux. You can just mount it normally using the mount command if you have JFS drivers installed (and it isn't ,obviously, a spanned volume group).
As I said, CRUX PPC bootkernels have JFS support built-in and jfsutils available (but without ACL).

Anyway the real answer is probably NO.

In AIX operating system, there exist two generations of JFS filesystem that are called JFS (JFS1) and JFS2 respectively. In the other operating systems, such as OS/2 and GNU/Linux, only the second generation exists and is called simply JFS. This should not be confused with JFS in AIX that actually refers to JFS1.

And again, if you still have an AIX partition layout on your system, you will get the following error message using fdisk to partition your disk:
Code:
  There is a valid AIX label on this disk.
  Unfortunately Linux cannot handle these
  disks at the moment.  Nevertheless some
  advice:
  1. fdisk will destroy its contents on write.
  2. Be sure that this disk is NOT a still vital
     part of a volume group. (Otherwise you may
     erase the other disks as well, if unmirrored.)
  3. Before deleting this physical volume be sure
     to remove the disk logically from your AIX
     machine.  (Otherwise you become an AIXpert).

Command (m for help):

You 'll be able to create a new empty DOS partition table but this will destroy any installed AIX version.
The Linux kernel, as I know 'cause i never tried, isn't able to manage aix partition table.

AIX and Linux can run concurrently in separate partitions on an LPAR-enabled system.


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 Post subject: Re: dual-booting AIX and CRUX on a single disk?
PostPosted: 24 Sep 2010, 00:42 
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Joined: 17 Dec 2005, 14:31
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Location: Italy
ppcaddon wrote:
i've the same question.
I also think the best way is to use a disk for each operating system and use SMS to boot the preferred one.


that's right, you must use the SMS menu and different hdd. AIX and Linux can run concurrently in separate partitions on an LPAR-enabled system (reference IBM Redbooks)

Quote:
I'm not sure but yaboot isn't able to boot AIX (there is no jfs support too), is it right?
Today i sent an email, asking help, on yaboot-user ml.


and again that's right, yaboot is unable to boot AIX


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 Post subject: Re: dual-booting AIX and CRUX on a single disk?
PostPosted: 24 Sep 2010, 00:56 
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Joined: 22 Sep 2010, 01:51
Posts: 4
Any possibility of this being an option for CRUX in the future?

I'll see if I cant pick up a few more disks from ebay....

Thanks for all your time and answers so far, appreciated.


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