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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