Well you are testing link failover and not I/O failover then .. (:
I would ideally try to do I/O through one path yank out the cable and watch the
I/O failover to the other path...
That is probably what you want to ensure if you want to use dm-multipath..
Also, make sure you change the configuration for failback from "immediate" to
"queue" so that you won't see immediate I/O failures and see the I/O safely
failover to the other path.
Thanks,
Shyam Iyer
Linux Engineering.
-----Original Message-----
From: linux-poweredge-boun...@dell.com on behalf of Brian O'Mahony
Sent: Wed 3/31/2010 2:02 PM
To: 'cri...@erad.com'; linux-poweredge-Lists
Subject: Re: Help with multipath failover
Ping to san ip and yanking a cable....
------------------------
Sent from my BlackBerry Wireless Handheld
----- Original Message -----
From: Charles Riley <cri...@erad.com>
To: Brian O'Mahony
Sent: Wed Mar 31 18:34:12 2010
Subject: Re: Help with multipath failover
How are you determining that it doesn't fail over?
Charles Riley
eRAD, Inc.
----- "Brian O'Mahony" <brian.omah...@curamsoftware.com> wrote:
> Im connecting a PE2850 to a Equalogic SAN, using multipath. I have a
> PCI NIC with one connection to the SAN and one from the onboard
> controller too. The SAN is ona different network, and is at IP
> 10.10.20.10.
>
>
>
> Here is the output from the multipath -ll
>
> [r...@ccvobtest2850 ~]# multipath -ll
>
> DubSanGrp01VolCC (36090a048d03f308d51b1f47c000030a6) dm-18
> EQLOGIC,100E-00
>
> [size=500G][features=1 queue_if_no_path][hwhandler=0][rw]
>
> \_ round-robin 0 [prio=1][enabled]
>
> \_ 3:0:0:0 sdc 8:32 [active][ready]
>
> \_ round-robin 0 [prio=1][enabled]
>
> \_ 4:0:0:0 sdd 8:48 [active][ready]
>
>
>
>
>
>
>
> And here is the multipath.conf:
>
> [r...@ccvobtest2850 ~]# cat /etc/multipath.conf
>
> ## Use user friendly names, instead of using WWIDs as names.
>
> defaults {
>
> user_friendly_names yes
>
> }
>
> blacklist {
>
> # wwid 26353900f02796769
>
> # devnode "^(ram|raw|loop|fd|md|dm-|sr|scd|st)[0-9]*"
>
> # devnode "^hd[a-z]"
>
> # devnode "^sd[a-b]"
>
> }
>
> multipaths {
>
> multipath {
>
> wwid 36090a048d03f308d51b1f47c000030a6
>
> alias DubSanGrp01VolCC
>
> }
>
> }
>
> devices {
>
> device {
>
> vendor "EQLOGIC"
>
> product "100E-00"
>
> path_grouping_policy failover
>
> getuid_callout "/sbin/scsi_id -g -u -s /block/%n"
>
> features "1 queue_if_no_path"
>
> path_checker readsector0
>
> failback immediate
>
> path_selector "round-robin 0"
>
> rr_min_io 10
>
> rr_weight priorities
>
> }
>
> }
>
>
>
>
>
> However when I unplug the cable to eth1, it doesn't failover. I am
> testing with a ping to the SAN at 10.10.20.10. As Im pretty new to all
> this, was wondering if anyone has any pointers on where I am going
> wrong.
>
>
>
> Thanks
>
> Brian
>
>
>
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