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Re: [dm-devel] DM-MP, Xen 5.0.0 and NetApp



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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