On Aug 26, 2014, at 3:11 PM, Learner <learner.st...@gmail.com> wrote:
> Another related observation and some questions; > > I am using open iscsi on init with IET on trgt over a single 10gbps link > > There are three ip aliases on each side > > I have 3 ramdisks exported by IET to init > > I do iscsi login 3 times, once using each underlying ip address and notice > that each iscsi session sees all 3 disks. > > Is it possible to restrict such that each init only sees one separate disk? > There is no iscsi initiator or target setting for this. The default is to show all paths (each /dev/sdx is a path to the same device).. You would have to manually delete some paths by doing echo 1 > /sys/block/sdX/device/remove > When I run fio on each mounted disk, I see that only two underlying tcp > sessions are being used - that limits the perf. > Any ideas on how to overcome this? How are you matching sessions with devices? It should just be a matter of running fio on the right devices. If you run: iscsiadm -m session -P 3 you can see how the sdXs match up with sessions/connections. If you run fio to a /dev/sdX from each session, you should be seeing IO to all 3 sessions. > > Thanks! > > > Sent from my iPhone > > On Aug 26, 2014, at 12:53 PM, "Mark Lehrer" <m...@knm.org> wrote: > >> On Tue, 26 Aug 2014 08:58:46 -0400 Alvin Starr <al...@iplink.net> wrote: >>> >>>>> I am trying to achieve10Gbps in my single initiator/single target >>>>> env. (open-iscsi and IET) >>>> >>>> On a semi-related note, are there any good guides out there to >>>> tuning Linux for maximum single-socket performance? On my 40 gigabit >>> >>> You are likely getting hit by the bandwidth-delay product. >>> Take a look at http://en.wikipedia.org/wiki/Bandwidth-delay_product >>> and http://www.kehlet.cx/articles/99.html >> >> Thanks that helped get my netcat transfer up over 500MB/sec using IPoIB. >> Unfortunately that is still only about 10% of the available bandwidth. >> >> I'll keep on tweaking and see how far I can take it. >> >> Thanks, >> Mark >> >> -- >> You received this message because you are subscribed to the Google Groups >> "open-iscsi" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to open-iscsi+unsubscr...@googlegroups.com. >> To post to this group, send email to open-iscsi@googlegroups.com. >> Visit this group at http://groups.google.com/group/open-iscsi. >> For more options, visit https://groups.google.com/d/optout. > > -- > You received this message because you are subscribed to the Google Groups > "open-iscsi" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to open-iscsi+unsubscr...@googlegroups.com. > To post to this group, send email to open-iscsi@googlegroups.com. > Visit this group at http://groups.google.com/group/open-iscsi. > For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups "open-iscsi" group. To unsubscribe from this group and stop receiving emails from it, send an email to open-iscsi+unsubscr...@googlegroups.com. To post to this group, send email to open-iscsi@googlegroups.com. Visit this group at http://groups.google.com/group/open-iscsi. For more options, visit https://groups.google.com/d/optout.
