Public bug reported:
We're seeing constant iSCSI session terminations and subsequent
recreations on Ubuntu 16.04 hosts running IO to an E-Series Array using
Jumbo Frames. We've pulled trace of the issue to determine a root cause
and discovered that the host appears to be overrunning the Max Command
Sequence Number set by the Target. The target is responds to this be
killing that session and recreating a new one in it's place as an error
recovery mechanism, so the crux of the issue is why the host seems to be
falling outside of iSCSI compliance and overrunning the Max Command
Sequence Number. This is the reason I went ahead and filed the bug
against open-iscsi.
Attached are actually two separate traces from two separate recreate,
one a Finisar Analyzer Trace, the other a typical TCP dump view-able
through wire-shark. I've also attached the Apport data for open-iscsi in
case that could be of any use.
** Affects: open-iscsi (Ubuntu)
Importance: Undecided
Status: New
** Attachment added: "Zip file containing a finisar trace, tcp dump, and apport
output for open-iscsi"
https://bugs.launchpad.net/bugs/1615694/+attachment/4725797/+files/Defect860730.zip
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https://bugs.launchpad.net/bugs/1615694
Title:
Host experiencing constant session termination and recreation while
using jumbo frames
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