Cisco Cisco UCS C22 M3 Rack Server 技術マニュアル

This document describes how SAP HIgh Performance Analytic Appliance (HANA) scale-out
solutions with Electromagnetic Compatability (EMC) VNX storage and applies to the Cisco SAP
HANA appliance as well as to SAP HANA Tailored Datacenter Integration (TDI) implementations.
It also explains how multipath configuration changes to mitigate unexpected outages of the
environment.

There are no specific requirements for this document.

This document is not restricted to specific software and hardware versions.

The information in this document was created from the devices in a specific lab environment. All of
the devices used in this document started with a cleared (default) configuration. If your network is
live, make sure that you understand the potential impact of any command.

For SAP HANA the required data and log file systems are mounted via fiber channel from the
EMC VNX storage. Mounting and unmounting of the devices is controlled by the SAP HANA
storage API and is based on the Linux Device Mapper Multipath (DM-MP) module. The
configuration consists of eight paths (active/passive) to each storage device.

With SUSE Linux Enterprise System 11.3, Linux kernel 3.0.101-0.40 a bug in the multipathing
logic has been detected

This may result in unexpected outages of the SAP HANA scale-out environment. 

The bug is not encountered as long as the hardware and cabling is error free.