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[dm-devel] rdac path failure - Sun 6140



Hello All,

I am seeing many of these messages when my Sun 6140 array is under heavy I/O
device-mapper: multipath: Failing path 8:208.
device-mapper: multipath: Failing path 8:208.
device-mapper: multipath: Failing path 8:208.
device-mapper: multipath: Failing path 8:208.
device-mapper: multipath: Failing path 8:208.


I am running a Fedora 10 server, with two fiber connections to two
different switches.  Both controllers on the 6140 have one connection
to each switch as well.  The end result is that I see four paths to
each LUN.

When the volume is mounted and under significant load I see the
messages above every few seconds.  They seem to appear every
"no_path_retry" seconds.

The 6140 controller firmware is up to date at version 07.50.08.10 and
I have installed the latest firmware for my Emulex LPe11002 cards.  I
have reproduced the problem using both Cisco MDS and Brocade fiber
channel switches as well.

Using CAM, I have set the initiator Host Type to "Linux" at the
moment.  I have tried other options as well without success.

I have NOT installed the RDAC drivers from either Sun or LSI -
primarily because they do not seem to build on my Fedora 10 kernel.

Any ideas would be greatly appreciated!!!

configs and debugging multipathd output is below.





Kernel: 2.6.27.24-170.2.68.fc10.x86_64

# multipath -lll
vol1 (3600a0b800048335200001e5d48b68a9b) dm-1 SUN,CSM200_R
[size=12T][features=1 queue_if_no_path][hwhandler=1 rdac][rw]
\_ round-robin 0 [prio=6][active]
 \_ 5:0:1:2 sdj 8:144 [active][ready]
 \_ 2:0:1:2 sdn 8:208 [active][ready]
\_ round-robin 0 [prio=0][enabled]
 \_ 2:0:0:2 sdb 8:16  [active][ghost]
 \_ 5:0:0:2 sdd 8:48  [active][ghost]


# cat /etc/multipath.conf

blacklist {
        devnode "^sd[a-z][[0-9]*]"
        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]*)*"
}

defaults {
        udev_dir                /dev
        polling_interval        10
        selector                "round-robin 0"
        path_grouping_policy    multibus
        getuid_callout          "/sbin/scsi_id --whitelisted /dev/%n"
        prio                    alua
        path_checker            readsector0
        rr_min_io               100
        max_fds                 8192
        rr_weight               priorities
        failback                immediate
        no_path_retry           fail
        user_friendly_names     yes
}
devices {
        device {
                vendor                  "SUN"
                product                 "CSM200_R"
                product_blacklist       "Universal Xport"
                getuid_callout          "/sbin/scsi_id --whitelisted /dev/%n"
                features                "0"
                hardware_handler        "1 rdac"
                path_selector           "round-robin 0"
                path_grouping_policy    group_by_prio
                failback                immediate
                rr_weight               uniform
                no_path_retry           queue
                rr_min_io               1000
                path_checker            rdac
                prio                    rdac
        }
}

multipaths {
        multipath {
                wwid                    3600a0b800048335200001e5d48b68a9b
                alias                   vol1
                rr_weight               priorities
                no_path_retry           5
                rr_min_io               100
        }
}



# multipathd -d v3


Aug 13 14:48:53 | sdb: ownership set to vol1
Aug 13 14:48:53 | sdb: not found in pathvec
Aug 13 14:48:53 | sdb: mask = 0xc
Aug 13 14:48:53 | sdb: path checker = rdac (controller setting)
Aug 13 14:48:53 | sdb: state = 4
Aug 13 14:48:53 | sdb: rdac prio = 0
Aug 13 14:48:53 | sdd: ownership set to vol1
Aug 13 14:48:53 | sdd: not found in pathvec
Aug 13 14:48:53 | sdd: mask = 0xc
Aug 13 14:48:53 | sdd: path checker = rdac (controller setting)
Aug 13 14:48:53 | sdd: state = 4
Aug 13 14:48:53 | sdd: rdac prio = 0
Aug 13 14:48:53 | sdj: ownership set to vol1
Aug 13 14:48:53 | sdj: not found in pathvec
Aug 13 14:48:53 | sdj: mask = 0xc
Aug 13 14:48:53 | sdj: path checker = rdac (controller setting)
Aug 13 14:48:53 | sdj: state = 2
Aug 13 14:48:53 | sdj: rdac prio = 3
Aug 13 14:48:53 | sdn: ownership set to vol1
Aug 13 14:48:53 | sdn: not found in pathvec
Aug 13 14:48:53 | sdn: mask = 0xc
Aug 13 14:48:53 | sdn: path checker = rdac (controller setting)
Aug 13 14:48:53 | sdn: state = 2
Aug 13 14:48:53 | sdn: rdac prio = 3
Aug 13 14:48:53 | vol1: pgfailback = -2 (controller setting)
Aug 13 14:48:53 | vol1: pgpolicy = group_by_prio (controller setting)
Aug 13 14:48:53 | vol1: selector = round-robin 0 (controller setting)
Aug 13 14:48:53 | vol1: features = 0 (controller setting)
Aug 13 14:48:53 | vol1: hwhandler = 1 rdac (controller setting)
Aug 13 14:48:53 | vol1: rr_weight = 2 (LUN setting)
Aug 13 14:48:53 | vol1: minio = 100 (LUN setting)
Aug 13 14:48:53 | vol1: no_path_retry = 5 (multipath setting)
Aug 13 14:48:53 | pg_timeout = NONE (internal default)
Aug 13 14:48:53 | vol1: set ACT_CREATE (map does not exist)
create: vol1 (3600a0b800048335200001e5d48b68a9b) n/a SUN,CSM200_R
[size=12T][features=0][hwhandler=1 rdac][n/a]
\_ round-robin 0 [prio=6][undef]
 \_ 5:0:1:2 sdj 8:144 [undef][ready]
 \_ 2:0:1:2 sdn 8:208 [undef][ready]
\_ round-robin 0 [prio=0][undef]
 \_ 2:0:0:2 sdb 8:16 [undef][ghost]
 \_ 5:0:0:2 sdd 8:48 [undef][ghost]


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