Thanks Mike - That helped On Saturday, August 23, 2014 2:41:01 AM UTC+5:30, Mike Christie wrote: > > > On Aug 22, 2014, at 12:07 PM, Redwood Hyd <redwo...@gmail.com > <javascript:>> wrote: > > Hi All, > I am trying to achieve10Gbps in my single initiator/single target env. > (open-iscsi and IET) > > I exported 3 Ramdisks, via 3 different IP aliases to initator, did three > iscsi logins , 3 mounts points and then 3 fio jobs in parallel (256K block > size each). > > Question 1) Is above a real use case where from same iscsi initiator i did > 3 iscsi logins to same target (via different IP addresses) ? Anything > pros/cons with this. > > > This seems normal. > > > Question 2) What are the other best ways to create parallel TCP flows > (because it seems open-iscsi does'nt have MC/S support) > > > Multiple sessions to different portals then use dm-multipath over all > those paths/sessions to the LU. > > Question 3) In this scenario can I use dm-multipath - can someone suggest > most common way so that at TCP level i get multiple flows. > > > What you described above, when you run > > /sbin/multipath > /sbin/multipath -ll > > Do you see each device having 3 paths? Did you set it up to do round robin > for dm multipath path selection? If so, each path is going to be a > different tcp socket connection which the iscsi initiator and dm-multipath > will use to send IO on. > > At my last job, fusion-io/sandisk, we sold a high performance target, and > to get the highest throughput when using linux we had to create extra > sessions/connections to avoid some bottlenecks in the linux block/scsi > layer. > > Above you would have a session to each target portal/ip. We would set > node.session.nr_sessions > in iscsid.conf to greater than one so each portal would have nr_sessions > sessions/connections. When you run iscsiadm -m node -T target -p ip -l, > iscsiadm would then create nr_session to that portal. iscsiadm -m session > would show the extra sessions when logged in and multipath -ll should show > the extra paths. > > You can also just do > > iscsiadm -m session -R SID -o new > > to dynamically add another session/connection. > >
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