[dm-devel] Round Robin vs Active/Passive

[Domenico Viggiani]

* Tore Anderson
> 4) with my configuration:
> 
>         device {
>                 vendor                  DGC
>                 product                 *
>                 product_blacklist       LUNZ
>                 path_grouping_policy    group_by_prio
>                 path_checker            tur
>                 no_path_retry           queue
>                 prio_callout            "/sbin/mpath_prio_emc /dev/%n"
>                 failback                immediate
>         }

Red Hat 4.6 defaults for EMC are:
       device {
               vendor                  "DGC"
               product                 "*"
               bl_product              "LUNZ"
               path_grouping_policy    group_by_prio
               getuid_callout          "/sbin/scsi_id -g -u -s"
               prio_callout            "/sbin/mpath_prio_emc /dev/%n"
               hardware_handler        "1 emc"
               features                "1 queue_if_no_path"
               path_checker            emc_clariion
               failback                immediate
       }
(from  /usr/share/doc/device-mapper-multipath-0.4.5/multipath.conf.defaults)
Why do you use different settings? Are they not "optimal"?

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DV