Re: DM-MP, Xen 5.0.0 and NetApp

[James Tanner <jtanner@redhat.com>]

Netapp support has a host setup guide which covers the settings you 
should be using in multipath.conf:

defaults
{
   user_friendly_names   yes
   max_fds               4096
}
blacklist
{
    wwid <DevId>
    devnode "^(ram|raw|loop|fd|md|dm-|sr|scd|st)[0-9]*"
    devnode "^hd[a-z]"
    devnode "^cciss!c[0-9]d[0-9]*[p[0-9]*]"
}
devices
{
    device
    {
      vendor                 "NETAPP"
      product                "LUN"
      getuid_callout         "/sbin/scsi_id -g -u -s /block/%n"
      prio_callout           "/sbin/mpath_prio_ontap /dev/%n"
      features               "1 queue_if_no_path"
      hardware_handler       "0"
      path_grouping_policy group_by_prio
      failback               immediate
      rr_weight              uniform
      rr_min_io              128
      path_checker           directio
      }
}


Try those out and see if it helps.

Rodrigo Nascimento wrote:
> multipath -ll output:
>  
> [root@CMPXEN02 ~]# multipath -ll
> 360a98000572d42774e6f4f2f682f6330dm-0 NETAPP,LUN
> [size=20G][features=1 queue_if_no_path][hwhandler=0]
> \_ round-robin 0 [prio=32][active]
>  \_ 0:0:0:0 sda        8:0   [active][ready]
>  \_ 0:0:1:0 sdb        8:16  [active][ready]
>  \_ 1:0:0:0 sdd        8:48  [active][ready]
>  \_ 1:0:1:0 sde        8:64  [active][ready]
>  \_ 2:0:0:0 sdh        8:112 [active][ready]
>  \_ 3:0:0:0 sdi        8:128 [active][ready]
>  \_ 3:0:1:0 sdj        8:144 [active][ready]
>  \_ 2:0:1:0 sdk        8:160 [active][ready]
> \_ round-robin 0 [prio=7][enabled]
>  \_ 0:0:2:0 sdc        8:32  [active][ready]
>  \_ 1:0:2:0 sdf        8:80  [active][ready]
>  \_ 1:0:3:0 sdg        8:96  [active][ready]
>  \_ 3:0:2:0 sdl        8:176 [active][ready]
>  \_ 3:0:3:0 sdn        8:208 [active][ready]
>  \_ 0:0:3:0 sdo        8:224 [active][ready]
>  \_ 2:0:3:0 sdp        8:240 [active][ready]
> \_ round-robin 0 [prio=0][enabled]
>  \_ 2:0:2:0 sdm        8:192 [failed][faulty]
>
>
> On Wed, Apr 1, 2009 at 11:36 AM, Hannes Reinecke <hare@suse.de 
> <mailto:hare@suse.de>> wrote:
>
>     Rodrigo Nascimento wrote:
>
>         Hi All,
>          I'm having problems to put the Multipathing tools to work
>         correctly with NetApp Cluster Solution.
>          I have a xenpool with 3 machines the multipathing are enabled
>         on them, the HBA are Qlogic, two FAS3140 controllers in
>         Cluster. I created a lun to be a storage repository (SR), the
>         lun is visible and was recognized on the 3 machines, but when
>         we say to the XenServer to build a SR with this Lun, all I/O
>         operations arrive to the FAS3140 by the non-optimized path.
>          *XenServer multipath.conf*
>          defaults {
>                user_friendly_names no
>         }
>         devices {
>                device {
>                        vendor                  "NETAPP"
>                        product                 "LUN"
>                        path_grouping_policy    group_by_prio
>                        getuid_callout          "/sbin/scsi_id -g -u -s
>         /block/%n"
>                        prio_callout          
>          "/sbin/mpath_prio_netapp /dev/%n"
>                        features                "1 queue_if_no_path"
>                        path_checker            directio
>                        failback                immediate
>                }
>         }
>          We made two tests, one with prio_callout as
>         /sbin/mpath_prio_alua and other with prio_callout as
>         /sbin/mpath_prio_netapp, both returns the same results.
>          
>
>
>     What's the output of 'multipath -ll'?
>     Looks like all paths are configured into one group here.
>
>     Cheers,
>
>     Hannes
>     -- 
>     Dr. Hannes Reinecke                   zSeries & Storage
>     hare@suse.de <mailto:hare@suse.de>                          +49
>     911 74053 688
>     SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg
>     GF: Markus Rex, HRB 16746 (AG Nürnberg)
>
>     --
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>
>
>
> -- 
> Rodrigo Nascimento
> ------------------------------------------------------------------------
>
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