Matthew Dickinson wrote: > > > On 11/10/09 11:39 AM, "Mike Christie" <micha...@cs.wisc.edu> wrote: >> What version of open-iscsi were you using and what kernel, and were you >> using the iscsi kernel modules with open-iscsi.org tarball or from the >> kernel? > > iscsi-initiator-utils-18.104.22.1681-0.10.el5 > kernel-2.6.18-164.2.1.el5 > > RedHat RPMs > >> >> It looks like we are sending more IO than the target can handle. In one >> of those cases it took more than 30 or 60 seconds (depending on your >> timeout value). >> >> What is the value of >> >> cat /sys/block/sdXYZ/device/timeout >> >> ? >> >> If it is 30 or 60 could you increase it to 360? After you login to the >> target do >> >> echo 360 > /sys/block/sdXYZ/device/timeout > > I've tried setting this, but it appears to have no effect - it was 60, and I > increased to 360. > >> And what is the value of: >> >> iscsiadm -m node -T your_target | grep node.session.cmds_max >> >> If that is 128, then could you decrease that to 32 or 16? >> >> Run >> >> iscsiadm -m node -T your_target -u >> iscsiadm -m node -T your_target -o update -n node.session.cmds_max -v 32 >> iscsiad-m node -T your_target -l > > I've tried setting to both 16 and 32, but it behaves about the same. > >> >> And if those prevent the io errors then could you do >> >> echo noop > /sys/block/sdXYZ/queue/scheduler >> >> to see if performance increases with a difference scheduler. > > > I really think I'm back to the duplicate ACK problem - see the attached > packet dump - at one point there's 30 duplicate ACKs... Interestingly, the
I did not get the attachement. > storage has "worked" for the past week - I'm using it as D2D backup. This > morning (about 7 days later), it's giving all these duplicate ACKs. > > I'm currently running into messages such as: > > Nov 19 09:46:58 backup iscsid: Kernel reported iSCSI connection 2:0 error > (1011) state (3) > Nov 19 09:47:00 backup kernel: session2: target reset succeeded If you are using Red Hat RPMs, make a red hat bugzilla https://bugzilla.redhat.com/. CC mchri...@redhat.com on the bugzilla or email me at that address when you have made the bugzilla. I will then add some network people to it. Attach your trace to the bugzilla. -- You received this message because you are subscribed to the Google Groups "open-iscsi" group. To post to this group, send email to open-is...@googlegroups.com. To unsubscribe from this group, send email to open-iscsi+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/open-iscsi?hl=.