Avago Technologies Syncro CS 9271-8i - Manual (Page 72)

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Syncro CS 9271-8i Solution User Guide
October 2013 Chapter 5: Troubleshooting
Confirming SAS Connections
5.2 Confirming SAS Connections
The high availability functionality of HA-DAS is based on redundant SAS data paths between the clustered nodes and
the disk drives. If all of the components in the SAS data path are configured and connected properly, each HA-DAS
controller has two SAS addresses for every drive, when viewed from the HA-DAS controllers.
This section explains how to use three tools (StorCLI, WebBIOS, and MSM) to confirm the correctness of the SAS data
paths.
5.2.1 Using WebBIOS to View Connections for Controllers, Expanders, and Drives
Use the Physical View in WebBIOS to confirm the connections between the controllers and expanders in the Syncro CS
system. As shown in the following figure, if both expanders are running, the view in WebBIOS from one of the nodes
includes the other HA-DAS RAID controller (Processor 8 in the figure), the two expanders, and any drives, as shown in
the following figure.
Figure 51 WebBIOS Physical View
If the other node is powered off, the other RAID controller does not appear in WebBIOS. Devices can appear and
disappear while the system is running, as connections are changed. Use the WebBIOS rescan feature to rediscover the
devices and topology after a connection change.
5.2.2 Using WebBIOS to Verify Dual-Ported SAS Addresses to Disk Drives
Use the Drive Properties View in WebBIOS to confirm that each SAS drive displays two SAS addresses. In a Syncro CS
9271-8i system that is properly cabled and configured, every drive should have two SAS addresses. If the system lacks
redundant SAS data paths, the WebBIOS shows only one SAS address on the screen.
To check the drive SAS addresses, open the Physical View on the home page of WebBIOS and click on a drive link. On
the Disk Properties page, click Next. When the redundant SAS data paths are missing, this second view of drive
properties shows only one SAS address in the left panel, as in the following figure.