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NetApp FAS6240 & Linux performance

After I presented a LUN from NetAPP FAS3240 to OEL 6.5 OS i face the below mentioned issue please suggest.

 

mpath13 (360a9800037536c4964244d7930486c6f) dm-20 NETAPP,LUN
[size=500M][features=0][hwhandler=0][rw]
\_ round-robin 0 [prio=0][enabled]
\_ 3:0:5:7 sdba 67:64 [failed][faulty]
\_ round-robin 0 [prio=0][enabled]
\_ 3:0:6:7 sdbj 67:208 [failed][faulty]
mpath6 (360a9800037536c4964244d7930486d30) dm-13 NETAPP,LUN
[size=200G][features=0][hwhandler=0][rw]
\_ round-robin 0 [prio=0][enabled]
\_ 3:0:5:0 sdat 66:208 [failed][faulty]
\_ round-robin 0 [prio=0][enabled]
\_ 3:0:6:0 sdbc 67:96 [failed][faulty]
mpath12 (360a9800037536c4964244d7930486c6d) dm-19 NETAPP,LUN
[size=500M][features=0][hwhandler=0][rw]
\_ round-robin 0 [prio=0][enabled]
\_ 3:0:5:6 sdaz 67:48 [failed][faulty]
\_ round-robin 0 [prio=0][enabled]
\_ 3:0:6:6 sdbi 67:192 [failed][faulty]
mpath5 (36005076309ffc2000000000000000003) dm-10 IBM,2107900
[size=400G][features=1 queue_if_no_path][hwhandler=0][rw]
\_ round-robin 0 [prio=5][active]
\_ 3:0:3:6 sdah 66:16 [active][ready]
\_ 3:0:4:6 sdaq 66:160 [active][ready]
\_ 3:0:0:6 sdg 8:96 [active][ready]
\_ 3:0:1:6 sdp 8:240 [active][ready]
\_ 3:0:2:6 sdy 65:128 [active][ready]
mpath11 (360a9800037536c4964244d7930486c6b) dm-18 NETAPP,LUN
[size=500M][features=0][hwhandler=0][rw]
\_ round-robin 0 [prio=0][enabled]
\_ 3:0:5:5 sday 67:32 [failed][faulty]
\_ round-robin 0 [prio=0][enabled]
\_ 3:0:6:5 sdbh 67:176 [failed][faulty]

5 REPLIES 5
Highlighted

Re: NetApp FAS6240 & Linux performance

Hello, 

 

Your problem smell like a multipathing problem 

What is the config file in this OS ?

 

Thanks

Highlighted

Re: NetApp FAS6240 & Linux performance

here is the output of multipath.conf output..

 

 

~]# more /etc/multipath.conf

# This is a basic configuration file with some examples, for device mapper

# multipath.

# For a complete list of the default configuration values, see

# /usr/share/doc/device-mapper-multipath-0.4.7/multipath.conf.defaults

# For a list of configuration options with descriptions, see

# /usr/share/doc/device-mapper-multipath-0.4.7/multipath.conf.annotated

 

 

# Blacklist all devices by default. Remove this to enable multipathing

# on the default devices.

#blacklist {

#        devnode "*"

#}

 

## By default, devices with vendor = "IBM" and product = "S/390.*" are

## blacklisted. To enable mulitpathing on these devies, uncomment the

## following lines.

#blacklist_exceptions {

#       device {

#               vendor  "IBM"

#               product "S/390.*"

#       }

#}

 

## Use user friendly names, instead of using WWIDs as names.

defaults {

        user_friendly_names yes

        polling_interval    30

        failback            immediate

        no_path_retry       5

        path_checker        tur

        rr_min_io           100

}

##

## Here is an example of how to configure some standard options.

##

#

#defaults {

#       udev_dir                /dev

#       polling_interval        10

#       selector                "round-robin 0"

#       path_grouping_policy    multibus

#       getuid_callout          "/sbin/scsi_id -g -u -s /block/%n"

#       prio_callout            /bin/true

#       path_checker            readsector0

#       rr_min_io               100

#       max_fds                 8192

#       rr_weight               priorities

#       failback                immediate

#       no_path_retry           fail

#       user_friendly_names     yes

#}

##

## The wwid line in the following blacklist section is shown as an example

## of how to blacklist devices by wwid.  The 2 devnode lines are the

## compiled in default blacklist. If you want to blacklist entire types

## of devices, such as all scsi devices, you should use a devnode line.

## However, if you want to blacklist specific devices, you should use

## a wwid line.  Since there is no guarantee that a specific device will

## not change names on reboot (from /dev/sda to /dev/sdb for example)

## devnode lines are not recommended for blacklisting specific devices.

##

#blacklist {

#       wwid 26353900f02796769

#       devnode "^(ram|raw|loop|fd|md|dm-|sr|scd|st)[0-9]*"

#       devnode "^hd[a-z]"

#}

#multipaths {

#       multipath {

#               wwid                    3600508b4000156d700012000000b0000

#               alias                   yellow

#               path_grouping_policy    multibus

#               path_checker            readsector0

#               path_selector           "round-robin 0"

#               failback                manual

#               rr_weight               priorities

#               no_path_retry           5

#       }

#       multipath {

#               wwid                    1DEC_____321816758474

#               alias                   red

#       }

#}

#devices {

#       device {

#               vendor                  "COMPAQ  "

#               product                 "HSV110 (C)COMPAQ"

#               path_grouping_policy    multibus

#               getuid_callout          "/sbin/scsi_id -g -u -s /block/%n"

#               path_checker            readsector0

#               path_selector           "round-robin 0"

#               hardware_handler        "0"

#               failback                15

#               rr_weight               priorities

#               no_path_retry           queue

#       }

#       device {

#               vendor                  "COMPAQ  "

#               product                 "MSA1000         "

#               path_grouping_policy    multibus

#       }

#}

devices {

        device {

                vendor                   "IBM"

                product                  "2107900"

                path_grouping_policy     group_by_serial

        }

}

###################################################################

multipaths {

    multipath {

        wwid          36005076309ffc2000000000000000108

        alias         OLR_1

        path_grouping_policy  group_by_serial

        path_checker      tur

        path_selector   "round-robin 0"

        failback        immediate

        rr_weight        priorities

        no_path_retry      5

    }

multipath {

        wwid          36005076309ffc200000000000000002d

        alias         VOT_1

        path_grouping_policy  group_by_serial

        path_checker      tur

        path_selector   "round-robin 0"

        failback        immediate

        rr_weight        priorities

        no_path_retry      5

    }

 

 

multipath {

        wwid          36005076309ffc200000000000000002e

        alias         VOT_2

        path_grouping_policy  group_by_serial

        path_checker      tur

        path_selector   "round-robin 0"

        failback        immediate

        rr_weight        priorities

        no_path_retry      5

    }

multipath {

        wwid          36005076309ffc200000000000000002f

        alias         VOT_3

        path_grouping_policy  group_by_serial

        path_checker      tur

        path_selector   "round-robin 0"

        failback        immediate

        rr_weight        priorities

        no_path_retry      5

    }

multipath {

        wwid          36005076309ffc2000000000000000030

        alias         VOT_4

        path_grouping_policy  group_by_serial

        path_checker      tur

        path_selector   "round-robin 0"

        failback        immediate

        rr_weight        priorities

        no_path_retry      5

    }

multipath {

        wwid          36005076309ffc2000000000000000047

        alias         ARCH_1

        path_grouping_policy  group_by_serial

        path_checker      tur

        path_selector   "round-robin 0"

        failback        immediate

        rr_weight        priorities

        no_path_retry      5

    }

multipath {

        wwid          36005076309ffc200000000000000013c

        alias         BKP_1

        path_grouping_policy  group_by_serial

        path_checker      tur

        path_selector   "round-robin 0"

        failback        immediate

        rr_weight        priorities

        no_path_retry      5

 

 

Highlighted

Re: NetApp FAS6240 & Linux performance

Hi, is depending your version cDOT or 7-Mode 

 

and after ALUA or not in your initiator group

 

but, so you can see this document :

https://library.netapp.com/ecmdocs/ECMP1654943/html/GUID-C5CFA561-7FD1-45F2-8BF8-1C7F04910274.html 

Highlighted

Re: NetApp FAS6240 & Linux performance

Hi,

I am using 7-mode and also not using ALUA in initiator group.

Highlighted

Re: NetApp FAS6240 & Linux performance

I have also tried rebooting the node. Also just to bring it to your notice, its a production node so before changing anything in the multipath.conf file i need to be prety sure as we cant afford any problems.

 

 

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