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There is a lot of good information on hosted vs. non-hosted partitions
in the Linux on iSeries Implementation Guide.
In a nutshell, this is the difference:
In a hosted environment, one or more Linux partitions have access to
certain hardware of a "hosting" OS/400 partition. This hardware includes
Disk, Tape and CD-ROM. It is possible to run this type of Linux
partition with no external I/O making it very cost efficient to create
many Linux partitions within an iSeries system. The hosted logical
partition must be started from the hosting OS/400 partition by varying
on a network server description. This partition can be active only when
the host server is both active and out of restricted state.
In a non-hosted environment, the I/O and devices must be completely
provided through natively attached hardware. A non-hosted partition does
not have access to Tapes, CD-ROM's or Disks in an OS/400 partition.
Because it is not possible to move hardware dynamically between Linux
partitions, it is not usually feasible to use switchable devices in
these partitions. A non-hosted logical partition is not dependent on the
hosting OS/400 partition for any I/O resources. The logical partition
has its own disk units or the partition makes use of networking support
to do a network start. A non-hosted logical partition can be started
even if the primary partition is not fully active.
So, if you want your Linux partition to be completely independent of your
OS/400 partition run it non-hosted. If you want to be able to share
devices run it hosted. Both types of partitions have access to the
virtual LAN and virtual console.
At V5R2 and above, you can download the RedHat ISO's to the IFS, load
them into an Image Catalog and install Linux from a virtual optical
device. You will need to manually change the virtual "CD's" if you
choose this method. You can also load different distributions and have
the ability to "dual-boot" your Linux server. ==================================
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