Show Table of Contents Hide Table of Contents English 日本語 English Multi-page HTML Single-page HTML PDF ePub Configuring device mapper multipathProviding feedback on Red Hat documentation1. Setting up DM Multipath1.1. Basic DM Multipath setup1.2. Ignoring local disks when generating multipath devices1.3. Configuring additional storage devices1.4. Setting up multipathing in the initramfs file system2. Modifying the DM-Multipath configuration file2.1. Configuration file overview2.2. Blacklisting devices from DM Multipath2.2.1. Blacklisting by WWID2.2.2. Blacklisting by device name2.2.3. Blacklisting by device type2.2.4. Blacklisting by udev property2.2.5. Blacklisting by device protocol2.2.6. Blacklist exceptions2.3. Modifying multipath configuration file defaults2.4. Modifying multipath settings for specific devices2.5. Modifying multipath settings for storage controllers2.6. Setting multipath values for all devices3. Managing multipathed volumes3.1. The multipath command3.1.1. Multipath command output3.1.2. Displaying multipath configuration3.2. Resizing an online multipath device3.3. Moving a root file system from a single path device to a multipath device3.4. Moving a swap file system from a single path device to a multipath device3.5. Determining device mapper entries with the dmsetup command3.6. Administering the multipathd daemon3.7. Cleaning up multipath files on package removal4. Troubleshooting DM Multipath4.1. DM Multipath troubleshooting checklist4.1.1. The multipath daemon is not running4.1.2. Issues with queue_if_no_path feature4.2. Troubleshooting with the multipathd interactive console5. Configuring maximum time for storage error recovery with eh_deadline5.1. The eh_deadline parameter5.2. Setting the eh_deadline parameterLegal Notice Configuring device mapper multipath Red Hat Enterprise Linux 8Using the Device Mapper Multipath featureRed Hat Customer Content ServicesLegal NoticeAbstract This documentation collection provides instructions on how to configure and manage the Device Mapper Multipath (DM-Multipath) feature on Red Hat Enterprise Linux 8. Providing feedback on Red Hat documentation Where did the comment section go?Red Hat's documentation publication system recently went through an upgrade to enable speedier, more mobile-friendly content. We decided to re-evaluate our commenting platform to ensure that it meets your expectations and serves as an optimal feedback mechanism. During this redesign, we invite your input on providing feedback on Red Hat documentation via the discussion platform.