talos-extensions/storage/multipath-tools

multipath-tools

This extension provides the multipathd daemon on the host for handling device-mapper multipathing. It enables consistent, fault-tolerant access to storage devices that expose multiple I/O paths.

What's Included

• multipathd: Multipath daemon
• multipath: Device mapper target autoconfig
• multipathc: Interactive client for multipathd
• mpathpersist: Manages SCSI persistent reservations on dm multipath devices
• kpartx: Create device maps from partition tables.

Use Case

To run this daemon you need the following kernel modules:

kernel:
    modules:
      - name: dm_multipath
      - name: dm_round-robin # or dm-queue-length

To configure multipath accordingly you need to apply something like:

apiVersion: v1alpha1
kind: ExtensionServiceConfig
name: multipathd
configFiles:
    - content: |
        defaults {
            user_friendly_names yes
            find_multipaths no
            path_selector "round-robin 0"
        }
      mountPath: /etc/multipath.conf

You probably need to use round-robin or queue-length (if that is supported by your use case) as the default service-time is not supported, since dm-service-time kernel module is not jet in talos build at the moment.

References

• multipath man page
• multipathd man page
• Related Kernel module issue