What is device mapper multipath?
What is device mapper multipath?
With Device mapper multipathing (DM Multipath), you can configure multiple I/O paths between server nodes and storage arrays into a single device. These I/O paths are physical Storage Area Network (SAN) connections that can include separate cables, switches, and controllers.
What is DM multipath and how does it work?
Multipathing aggregates the I/O paths and creates a new device that consists of the aggregated paths. DM Multipath provides: DM Multipath can provide failover in an active/passive configuration. In an active/passive configuration, only half the paths are used at any time for I/O.
How do I stop multipathd?
Multipathd is interpreting the spec to the letter of the law, you could have also done “XIOTECH.*” if you really want to be sure. Once you make these changes, stop multipathd using your initscripts, multipath -F which will flush your config and then start multipathd again. Your config file should be honored now.
Why is multipathd not matching my devices?
There’s a subtle bug in your multipath.conf, vendor and product are matching at the regexp level, that you’ve added a series of leading spaces is causing multipathd to fail to match your configuration with the actual devices on the system.
How do I release a multipath device from a process?
Locate any subsystem or process holding the multipath device open. For any subsystem or process holding the multipath device open, stop the process, or issue commands to release the multipath device.
How do I assign a persistent name to a device using multipath?
In the /etc/multipath.conf file on one node: Set the user_friendly_names configuration option to yes to enable it. Multipath uses the /var/lib/multipath/bindings file to assign a persistent and unique name to the device in the form of mpath< n > in the /dev/mapper directory.
How do I remove partition mapping on a multipath device?
One or more partition mapping (s) still exists on the multipath device. Use “ kpartx -d ” on the multipath device to remove the device partition mapping (s). A filesystem exists on the multipath device and is currently mounted. Unmount the filesystem and if it exists in /etc/fstab, remove it.
