multipathd & EMC Clariion CX-4

* multipathd & EMC Clariion CX-4
@ 2011-09-14  9:58 NEVEU Stephane
  2011-09-14 10:46 ` Gianluca Cecchi
  2011-09-14 11:39 ` Hannes Reinecke
  0 siblings, 2 replies; 7+ messages in thread
From: NEVEU Stephane @ 2011-09-14  9:58 UTC (permalink / raw)
  To: dm-devel@redhat.com

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Hi all,

I'm experiencing problems trying to set up a multipathd config with a EMC Clariion CX-4 Storage.
It seems that the CX4 is actually active/passive regarding SPs. My server  has QLogic Fiber Cards. My multipath-tools version is 0.4.8.
Here is my multipath.conf :

##
## This is a template multipath-tools configuration file
## Uncomment the lines relevent to your environment
##
defaults {
                user_friendly_names   yes
}
blacklist {
                #devnode "*"
                devnode "^(ram|raw|loop|fd|md|dm-|sr|scd|st)[0-9]*"
                devnode "^hd[a-z][[0-9]*]"
                devnode "^cciss!c[0-9]d[0-9]*[p[0-9]*]"
}
devices {
                device {
                               vendor                                "DGC  "
                               product                                               "*"
                               path_grouping_policy   group_by_prio
                               getuid_callout          "/lib/udev/scsi_id -g -u -d /dev/%n"
                               prio_callout                       "/sbin/mpath_prio_emc /dev/%n"
                               hardware_handler         "1 emc"
                               features "1 queue_if_no_path"
#                             failback                                15
#                             rr_weight                           priorities
                               no_path_retry                 300
                               path_checker                   emc_clarion
                               failback                                immediate
#                             rr_min_io                           100
                               product_blacklist            LUN_Z
                }
}

multipaths {

                multipath {
                               wwid                                    360060160174026008cf8cef961cde011
                               alias                                      NPCD
                }

                multipath {
                wwid                    36006016017402600f2ed610b62cde011
                alias                   NDO
        }

                multipath {
                wwid                    360060160174026000c984cc67acde011
                alias                   NAGIOS
        }

}

And here is the result of a multipath -ll :

sdg: checker msg is "directio checker reports path is down"
sdm: checker msg is "directio checker reports path is down"
NDO (36006016017402600f2ed610b62cde011) dm-8 DGC     ,RAID 5
[size=50G][features=1 queue_if_no_path][hwhandler=1 emc]
\_ round-robin 0 [prio=2][active]
 \_ 2:0:0:1 sdd 8:48  [active][ready]
 \_ 5:0:0:1 sdj 8:144 [active][ready]
\_ round-robin 0 [prio=0][enabled]
 \_ 2:0:1:1 sdg 8:96  [active][faulty]
 \_ 5:0:1:1 sdm 8:192 [active][faulty]
sde: checker msg is "directio checker reports path is down"
sdk: checker msg is "directio checker reports path is down"
NAGIOS (360060160174026000c984cc67acde011) dm-6 DGC     ,RAID 5
[size=40G][features=1 queue_if_no_path][hwhandler=1 emc]
\_ round-robin 0 [prio=2][active]
 \_ 2:0:1:2 sdh 8:112 [active][ready]
 \_ 5:0:1:2 sdn 8:208 [active][ready]
\_ round-robin 0 [prio=0][enabled]
 \_ 2:0:0:2 sde 8:64  [active][faulty]
 \_ 5:0:0:2 sdk 8:160 [active][faulty]
sdc: checker msg is "directio checker reports path is down"
sdi: checker msg is "directio checker reports path is down"
NPCD (360060160174026008cf8cef961cde011) dm-7 DGC     ,RAID 5
[size=100G][features=1 queue_if_no_path][hwhandler=1 emc]
\_ round-robin 0 [prio=2][active]
 \_ 2:0:1:0 sdf 8:80  [active][ready]
 \_ 5:0:1:0 sdl 8:176 [active][ready]
\_ round-robin 0 [prio=0][enabled]
 \_ 2:0:0:0 sdc 8:32  [active][faulty]
 \_ 5:0:0:0 sdi 8:128 [active][faulty]

So when trying to write on a virtual device /dev/mapper/NAGIOS (for exemple) I see many I/O errors on 'faulty disks'. When tresspassing LUNs on the clariion, I see ready disks becoming faulty and faulty ones becoming ready ... I also have udevd (udev-work) burning my CPUs while trying to rename '/dev/disk/by-id/wwn-0xetcetc...udev-tmp'
What's wrong with my config ? Am I missing something ?
Thx by advance for your help,
Regards,

Cordialement,

--
Stéphane Neveu
Ingénieur Opensource / RedHat Technical Manager
THALES - Critical Information Systems
DIVISION Security Solutions & Services / Server Mgmt
Tél 01 73 17 03 15
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