multipath: Unrecognised multipath feature request

[ivan]

Hi.

the following stanza in /etc/multipath.conf

features "2 queue_if_no_path no_partitions"

produces the following error "multipath: Unrecognised multipath feature request" and no devices is visible under /dev/mapper

If the line above is commented out, multipath works ok, although all the partitions within the devices under /dev/mapper are shown. I have also tried using

features "1 no_partitions"

and it didn't work

This configuration is been used in production machines running SLES 11SP3 - SLES 12SP1 and it is working as expected

-------------------------------------------------------------------------------------------

lsb_release -rd
Description: Ubuntu 16.04.1 LTS
Release: 16.04

-------------------------------------------------------------------------------------------

apt-cache policy multipath-tools
multipath-tools:
  Installed: 0.5.0+git1.656f8865-5ubuntu2.2
  Candidate: 0.5.0+git1.656f8865-5ubuntu2.2
  Version table:
 *** 0.5.0+git1.656f8865-5ubuntu2.2 500
        500 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages
        100 /var/lib/dpkg/status
     0.5.0+git1.656f8865-5ubuntu2 500
        500 http://us.archive.ubuntu.com/ubuntu xenial/main amd64 Packages

-------------------------------------------------------------------------------------------

cat /etc/multipath.conf

blacklist {
        devnode "^(ram|raw|loop|fd|md|dm-|sr|scd|st)[0-9]*"
        devnode "^hd[a-z]"
        devnode "^dcssblk[0-9]*"
        devnode "^(td|hd|vd)[a-z]"
        devnode "^nvme.*"
        devnode "^cciss!c[0-9]d[0-9]*"
        device {
                vendor "DELL"
                product ".*"
        }
}
blacklist_exceptions {
        device {
                vendor "DELL"
                product "MD32xxi"
        }
}
defaults {
        user_friendly_names yes
        max_fds 8192
}
devices {
        device {
                vendor "DELL"
                product "MD32xxi"
                path_grouping_policy group_by_prio
                prio rdac
# polling_interval 5
                path_checker rdac
                path_selector "round-robin 0"
# hardware_handler "1 rdac"
                failback immediate
                features "2 queue_if_no_path no_partitions"
                #no_path_retry 30
                rr_min_io 100
# prio_callout "/sbin/mpath_prio_rdac /dev/%n"
        }
}

[Mathieu Trudel-Lapierre (cyphermox)]

Could this be something that is included only in a patch in SLES?

I'll look into it, it should be fairly easy to find the relevant patch in git or in SLES packaging.