The Linux device-mapper, among other uses, maps a logical block device on the SAN host to a LUN. The Linux Multipath Tools use Device Mapper to present the multiple paths to a LUN as a single device. The Oracle FS Path Manager (FSPM) daemon monitors the Multipath Tools and integrates with the Multipath Tools to provide multipathing.
FSPM requires the device-mapper and multipath—tools version that comes with the Linux distribution.
- Verify that device-mapper package is installed.
Run the following commands:
# rpm -qa | grep device-mapper | grep -v multipath
Result:The output displays all versions of all installed packages that include device-mapper in their names.
- If the device-mapper packages are not installed, install them.
You can install the packages from your Linux installation media or the operating system vendor website.
- Verify that the Multipath Tools packages are installed.
Run the following command:
# rpm -qa | grep multipath
Result:The output displays all installed packages that include multipath in the package names. The name of the Multipath Tools package differs between distributions but is usually multipath-tools or device-mapper-multipath. Some distributions also require a second package which is usually named device-mapper-multipath-libs.
- If the Multipath Tools packages are not installed, install the packages and any dependencies. You can install the packages from your Linux installation CDs or the operating system vendor website.