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Once the path is restored, an informational message is sent to the same queue. To monitor the
status of the paths in IBM i:
•
Start Services Tools and sign on
•
Work with disk units
•
Display disk configuration
•
Display disk path status
Note that while the HMC allows a single VSCSI client adapter to be tagged as an IPL device, it is
not required to change the tagged resource if that path is lost. As long as the alternate path
through the second VIOS is active, the IBM i LPAR will be able to IPL. from the same load source
LUN. The alternate path must exist prior to the loss of the original IPL path and prior to powering
the IBM i LPAR off.
9.3.3 Subsystem Device Driver – Path Control Module (SDDPCM)
VIOS also supports the Subsystem Device Driver – Path Control Module (SDDPCM) for certain
storage subsystems. Examples of supported subsystems include the SAN Volume Controller
(SVC) and IBM DS8000. To find out whether a particular storage system supports SDD-PCM for
VIOS, consult its interoperability matrix on the SDDPCM Web site:
http://www.ibm.com/support/docview.wss?uid=ssg1S4000201. Note that there are separate
support statements for AIX and VIOS. If SDDPCM is supported on your storage subsystem for
VIOS, download and install the driver following the instructions in the Multi-path Subsystem
Device Driver User's Guide at the same location.
10. Attaching open storage to IBM i through VIOS
As described in section 8, IBM i joins the VIOS virtualization environment, allowing it to use open
storage. The setup process involves three main steps:
•
Open storage configuration
•
VIOS installation and configuration
•
IBM i installation and configuration
The VIOS and open storage configuration steps are the same as for existing clients of VIOS,
such as AIX and Linux. These steps are well documented and any existing skills in those areas
would apply to IBM i as a client partition, as well. The only significant difference with IBM i is the
specific open storage configuration requirements in order to achieve good performance, as
referenced in section 9.2.
10.1. Open storage configuration
All open storage subsystems follow similar general configuration steps:
•
Perform physical disk and RAID configuration
•
Create volumes (LUNs)
•
Attach those volumes to a host (VIOS in this case)
Naturally, the detailed steps and graphical interfaces used vary by subsystem. Locate the correct
documentation for your supported subsystem at http://www.redbooks.ibm.com. Importantly,
follow the instructions for creating and attaching LUNs to an AIX host.
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