Re: [Iscsitarget-devel] [iscsitarget-devel] mulpath.conf example?

[Marko K. <mar...@ar...>]

Hi,

Thanks for the hint. I've added this to multipathd.conf

# IET Target
devices {
     device {
          vendor                  "IET"
          product                 "VIRTUAL-DISK"
          path_grouping_policy    multibus
          path_grouping_policy    group_by_prio
          path_selector           "round-robin 0"
          failback                immediate
          rr_min_io               1
          rr_weight               priorities
     }
}

restarted multipath and now I see:

mpathb (1494554000000000067722d70726f6430392d736f6c723032) dm-0 IET,VIRTUAL-DISK
size=1.0T features='0' hwhandler='0' wp=rw
`-+- policy='round-robin 0' prio=1 status=active
  |- 4:0:0:0 sda        8:0   active ready running
  `- 5:0:0:0 sdb        8:16  active ready running


and dd shows:

# sync; time `dd if=/dev/zero of=/index2/ddfile bs=1M count=20480 && sync`
20480+0 records in
20480+0 records out
21474836480 bytes (21 GB) copied, 84.4271 s, 254 MB/s

Now I'm happy ;)


Kind regards, Marko Kobal


From: Donald Williams [mailto:don...@gm...]
Sent: Monday, July 09, 2012 6:30 PM
To: Marko Kobal
Subject: Re: [iscsitarget-devel] mulpath.conf example?

That's because MPIO isn't completely configured.  The output needs to be like this:
mpathb (1494554000000000067722d70726f6430392d736f6c723032) dm-0 IET,VIRTUAL-DISK
size=1.0T features='0' hwhandler='0' wp=rw
|-+- policy='round-robin 0' prio=1 status=active
| `- 2:0:0:0 sda        8:0   active ready running
`  `- 3:0:0:0 sdb        8:16  active ready running

  You can try #multipath -v2   then #multipath -ll  again.  If that still doesn't show correctly restart the multipath daemon service.


On Mon, Jul 9, 2012 at 12:09 PM, Marko Kobal <mar...@ar...<mailto:mar...@ar...>> wrote:
Hi,

Thanks, I've managed to get it working:

mpathb (1494554000000000067722d70726f6430392d736f6c723032) dm-0 IET,VIRTUAL-DISK
size=1.0T features='0' hwhandler='0' wp=rw
|-+- policy='round-robin 0' prio=1 status=active
| `- 2:0:0:0 sda        8:0   active ready running
`-+- policy='round-robin 0' prio=1 status=enabled
  `- 3:0:0:0 sdb        8:16  active ready running

I see only the first path is active, how can I set it to active-active setup?


Lep pozdrav, Marko Kobal
CTO, Arctur d.o.o.

From: Donald Williams [mailto:don...@gm...<mailto:don...@gm...>]
Sent: Monday, July 09, 2012 5:12 PM
To: Marko Kobal
Subject: Re: [Iscsitarget-devel] mulpath.conf example?

Are you asking for help setting up MPIO itself or tweaking the resulting devices?

Centos includes a sample multipath.conf under /usr/share/doc/device-mapper-multipath-0.4.7
It's called multipath.conf.defaults.  This file allows you to manage how MPIO devices are handled, it does not actually configure MPIO.

 I know how to configure MPIO for an Equallogic SAN, but not for IETd.  I suspect others on this list will be able to help you.

Regards,


On Mon, Jul 9, 2012 at 10:17 AM, Marko Kobal <mar...@ar...<mailto:mar...@ar...>> wrote:
Hi,

I would like to setup multipath from a Centos6 box to an IET target (via 2x Gbit interfaces) ... Can one provide me with a samle mulpath.conf?


Kind regards, Marko Kobal
CTO, Arctur d.o.o.


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