[dm-devel] multipathd & EMC Clariion CX-4
NEVEU Stephane
stephane.neveu at thalesgroup.com
Wed Sep 14 09:58:48 UTC 2011
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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