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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