[CentOS] CentOS and Dell MD3200i / MD3220i iSCSI w/ multipath

Sat Jan 22 01:07:37 UTC 2011
Ross Walker <rswwalker at gmail.com>

On Jan 21, 2011, at 7:20 PM, Edward Morbius <dredmorbius at gmail.com> wrote:

> 
> 
> On Fri, Jan 21, 2011 at 3:58 PM, Ross Walker <rswwalker at gmail.com> wrote:
> On Jan 21, 2011, at 6:41 PM, Edward Morbius <dredmorbius at gmail.com> wrote:
> 
>> We've been wrestling with this for ... rather longer than I'd care to admit.
>> 
>> Host / initiator systems are a number of real and virtualized CentOS 5.5 boxes.  Storage arrays / targets are Dell MD3220i storage arrays.
>> 
>> ...
> 
> 
> Once this is installed you need to setup dm-multipath, look for multipathd.conf in /etc, get the product id and vendor id from dmesg after making an initial connection via open-iscsi and use that in the mutipath config. Your going to need to use path utility 'rdac' in the config instead of tur.
> 
> Google is your friend here.
> 
> -Ross
> 
> 
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> 
> /etc/multipath.conf appears to be appropriately configured (we'd installed the MDSM host components):
> 
> ------------------------------------------------------------------------
>          device {
>                 vendor                  "DELL"
>                 product                 "MD32xxi"
>                 path_grouping_policy    group_by_prio
>                 prio                    rdac
>                 polling_interval        5
>                 path_checker            rdac
>                 path_selector           "round-robin 0"
>                 hardware_handler        "1 rdac"
>                 failback                immediate
>                 features                "2 pg_init_retries 50"
>                 no_path_retry           30
>                 rr_min_io               100
>                 prio_callout            "/sbin/mpath_prio_rdac /dev/%n"
>         }
>         device {
>                 vendor                  "DELL"
>                 product                 "MD32xx"
>                 path_grouping_policy    group_by_prio
>                 prio                    rdac
>                 polling_interval        5
>                 path_checker            rdac
>                 path_selector           "round-robin 0"
>                 hardware_handler        "1 rdac"
>                 failback                immediate
>                 features                "2 pg_init_retries 50"
>                 no_path_retry           30
>                 rr_min_io               100
>                 prio_callout            "/sbin/mpath_prio_rdac /dev/%n"
>         
>         }
> }

AFAIK the RDAC you have installed looks correct and the config also looks good.

Did you start the multipath service make a connection to each IP and do a 'multipath -ll' and see what shows up?

-Ross
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