Linux For S/390 And Zseries; Attaching A Storage Unit To An S/390 Or Zseries Host Running Linux; Running Linux On An S/390 Or Zseries Host - IBM TotalStorage DS6000 Attachment Manual

Linux for S/390 and zSeries

Attaching a storage unit to an S/390 or zSeries host running Linux

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Running Linux on an S/390 or zSeries host

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DS6000 Host Systems Attachment Guide
v If you have open-systems traffic with fibre-channel protocol, continue to create
zones that include the host ports and all desired storage ports. Multiple
overlapping zones should be used in this case to support communication from
multiple host ports to share device ports.
This section tells you how to attach a storage unit to an S/390 or zSeries host
system that runs Linux.
This topic provides the references you need to attach a storage unit to an S/390 or
zSeries host running Linux.
You can use either direct or switched attachment to attach a storage unit to an
S/390 or zSeries host system that runs SUSE SLES 8 or 9 or Red Hat Enterprise
Linux 3.0 with current maintenance updates for ESCON and FICON. For the most
current list of supported hosts and release levels, see the Interoperability Matrix at
http://www.ibm.com/servers/storage/disk/ds6000/interop.html.
For up-to-date information about the versions of Linux you can run on an S/390 or
zSeries host, see http://www.suse.de/us/business/products/server/.
Disabling automatic system updates
Many Linux distributions give administrators the ability to configure their systems for
automatic system updates. Red Hat provides this ability in the form of a program
called up2date, and SUSE provides a program called YaST Online Update. You can
configure these features to query for updates that are available for each host and to
automatically install any new updates that they find, which can include updates to
the kernel.
If your host is attached to the DS6000 series and is running the IBM Multipath
Subsystem Device Driver (SDD), you should consider turning off this automatic
update feature because some drivers supplied by IBM, like SDD, are dependent an
a specific kernel and cannot function in the presence of a new kernel. Similarly,
host bus adapters drivers must be compiled against specific kernels to function
optimally. By allowing automatic update of the kernel, you risk an unexpected
impact to your host system.
This section provides the information you need to run Linux on an S/390 or zSeries
host.
There are three ways to run Linux on an S/390 or zSeries host:
v Native
Linux can run on the entire machine with no other operating system.
v Logical Partition (LPAR)
You can logically partition the hardware into a maximum of 15 separate LPARs
per logical channel subsystem. For example, you can have S/390 applications in
one partition, VM and VSE applications in another partition, and Linux
applications in another partition.
v z/VM guest support