[dm-devel] Re: RHEL 4.3 to Sun 6320 storage

[Kevin Foote]

Andrew
I'm not a pro at dm-multipath but if you are looking for failover dont you
want your  path_grouping_policy line to be

    default_path_grouping_policy    failover

that way your multipath -ll output would look something like

archives (30690a018a0e3a3178c46f4510900307f)
[size=16 GB][features="0"][hwhandler="0"]
\_ round-robin 0 [active]
 \_ 2:0:1:0  sdc 8:32   [active][ready]
\_ round-robin 0 [enabled]
 \_ 3:0:1:0  sdo 8:224  [active][ready]

hope some of that made sense..

-- 
:wq!
kevin.foote

On 6/27/06, Andrew Elwell <andrewe at epcc.ed.ac.uk> wrote:
>
> Hi folks,
>
> I'm trying to set up access to our SAN, 5 cabinets of 6320 storage, from
> CentOS 4.3 using dm-multipath and two Emulex lpfc cards.
>
>
> So far I can see the correct arrays through the zoning and have setup
> multipath.conf as below:
>
> defaults {
>         user_friendly_names     yes
>         polling_interval        1
>         path_checker            tur
>         path_grouping_policy    group_by_serial
> }
> devnode_blacklist {
>         devnode "^(ram|raw|loop|fd|md|dm-|sr|scd|st)[0-9]*"
>         devnode "^hd[a-z]"
>         devnode "^sd[a-b]"
>         # sda and sdb are internal 3ware raid and sata system disk
>         devnode "^cciss!c[0-9]d[0-9]*"
> }
> multipaths {
>         multipath {
>                 wwid     360003baccb976000426f26d30004c45a
>                 alias    cab2a01t0
>         }
>         multipath {
>                 wwid    360003baccb976000426f27a00006ae93
>                 alias   cab2a01t1
>         }
>         ... snip more multipath definitions....
> }
>
> multipath -ll shows..
>
>
> cab2a01t2 (360003baccb976000426f289000049adb)
> [size=1638 GB][features="0"][hwhandler="0"]
> \_ round-robin 0 [active]
> \_ 3:0:0:2 sde 8:64  [failed][faulty]
> \_ 4:0:0:2 sdj 8:144 [active][ready]
>
> cab2a01t1 (360003baccb976000426f27a00006ae93)
> [size=1638 GB][features="0"][hwhandler="0"]
> \_ round-robin 0 [active]
> \_ 3:0:0:1 sdd 8:48  [active][ready]
> \_ 4:0:0:1 sdi 8:128 [active][ready]
>
> cab2a01t0 (360003baccb976000426f26d30004c45a)
> [size=1638 GB][features="0"][hwhandler="0"]
> \_ round-robin 0 [active]
> \_ 3:0:0:0 sdc 8:32  [active][ready]
> \_ 4:0:0:0 sdh 8:112 [active][ready]
>
>
>
> but the error log is filling up with
> kernel: Device sde not ready.
> kernel: end_request: I/O error, dev sde, sector 2181037632
> multipathd: 8:64: mark as failed
> multipathd: cab2a01t2: remaining active paths: 1
> multipathd: 8:64: tur checker reports path is up
> multipathd: 8:64: reinstated
> multipathd: cab2a01t2: remaining active paths: 2
> kernel: Device sde not ready.
> kernel: end_request: I/O error, dev sde, sector 3187670215
> kernel: device-mapper: dm-multipath: Failing path 8:64.
>
> etc. I guess I should be using something other than the default for
> prio_callout, but what?
>
> Please can someone give me hints on the correct incantation for
> path_checker, path_grouping_policy, prio_callout
>
> Many thanks
>
> Andrew
>
> --
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