[lustre-discuss] Wanted: multipath.conf for dell ME4 series arrays

[Andrew Elwell]

Hi Jeff,

On Wed, 21 Aug 2019 at 17:34, Jeff Johnson
<jeff.johnson at aeoncomputing.com> wrote:
> What underlying Lustre target filesystem? (assuming ldiskfs with a hardware RAID array)
correct - ldiskfs, using 8* raid6 luns per ME4084

> What does your current multipath.conf look like?
we just had blacklist, WWNs and mappings, we were missing any ME4
specific device {} settings, however I've since found the magic
incantation from
https://downloads.dell.com/manuals/common/powervault-me4-series-linux-dell-emc-2018-3924-bp-l_wp_en-us.pdf,
notably

device {
       vendor "DellEMC"
       product "ME4"
       path_grouping_policy "group_by_prio"
       path_checker "tur"
       hardware_handler "1 alua"
       prio "alua"
       failback immediate
       rr_weight "uniform"
       path_selector "service-time 0"
   }
and it seems to be working a whole lot better :-)

<support request can be closed, thanks folks for your patience>