Re: CentOS and Dell MD3200i / MD3220i iSCSI w/ multipath

[Edward Morbius <dredmorbius@xxxxxxxxx>]

On Fri, Jan 21, 2011 at 3:58 PM, Ross Walker <rswwalker@xxxxxxxxx> wrote:

On Jan 21, 2011, at 6:41 PM, Edward Morbius <dredmorbius@xxxxxxxxx> 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"
       
        }
}
------------------------------------------------------------------------

-- 
Dr. Ed Morbius
Chief Scientist
Krell Power Systems Unlimited

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