[stgt] Multiple active paths

[Mark Ruys]

On Wed Jun 2 17:39:31 CEST 2010, Chandra Seetharaman wrote:

> Hi Mark,
>
> dm multipath is treating multiple paths to the iSCSI lun as fail over
> paths. Hence it is putting them in different path groups. It has nothing
> to do with iSCSI target.

So I posted this question to the wrong mailing list. Apologies.

> Add the following stanza to /etc/multipath.conf and restart multipath by
> running "multipath -f billy" and "service multipathd restart"
>
> ------------------
> devices {
> 	device {
>                 vendor "IET"
>                 product "VIRTUAL-DISK"
>                 path_grouping_policy multibus
>          }
> }
> ------------------
>

That did the trick :)

> For more information on multipath usage, have a read at:http://sources.redhat.com/lvm2/wiki/MultipathUsageGuide
>

Useful for me! Thanks.

Mark

> chandra
>
> On Wed, 2010-06-02 at 15:23 +0200, Mark Ruys wrote:
> >/  Hi,
> />/
> />/  I've just succesfully set up an tgtd target on a CentOS 5.5 machine
> />/  having four (non-bonded) nic's. My initiator connects as follows:
> />/
> />/  billy (1IET_00010001) dm-3 IET,VIRTUAL-DISK
> />/  [size=400G][features=0][hwhandler=0][rw]
> />/  \_ round-robin 0 [prio=1][active]
> />/    \_ 17:0:0:1  sdh  8:112  [active][ready]
> />/  \_ round-robin 0 [prio=1][enabled]
> />/    \_ 19:0:0:1  sdo  8:224  [active][ready]
> />/  \_ round-robin 0 [prio=1][enabled]
> />/    \_ 20:0:0:1  sdz  65:144 [active][ready]
> />/  \_ round-robin 0 [prio=1][enabled]
> />/    \_ 18:0:0:1  sdj  8:144  [active][ready]
> />/
> />/  So the path through /dev/sdh is active and used. For another EMC target,
> />/  I get:
> />/
> />/  bulbby (360060160b9781b008488bd4f0e2fde11) dm-7 DGC,RAID 10
> />/  [size=15G][features=1 queue_if_no_path][hwhandler=1 emc][rw]
> />/  \_ round-robin 0 [prio=2][active]
> />/    \_ 14:0:0:5  sdr  65:16  [active][ready]
> />/    \_ 16:0:0:5  sdy  65:128 [active][ready]
> />/  \_ round-robin 0 [prio=0][enabled]
> />/    \_ 13:0:0:5  sdaq 66:160 [active][ready]
> />/    \_ 15:0:0:5  sdar 66:176 [active][ready]
> />/
> />/  As I understand it, in this case both /dev/sdr and /dev/sdy are used
> />/  doubling the network throuhgput capacity. How can I achieve this with
> />/  tgtd? I tried to find an answer in this mailing list in vain.
> />/
> />/  Thanks,
> />/
> />/  Mark
> />/
> />/  /etc/tgt/targets.conf:
> />/
> />/  default-driver iscsi
> />/
> />/  <target iqn.2010-05.net.maas:rijn.tgt>
> />/           backing-store /dev/VG00/Billy
> />/           initiator-address 192.168.91.0/24
> />/           initiator-address 192.168.92.0/24
> />/  </target>
> />/
> />/
> /

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