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Bug#466954: open-iscsi: Hangs trying to log out of Dell MD3000i

Andrew Moise wrote:

forwarded 466954 open-iscsi@googlegroups.com
thanks

  Hi all.
  I'm having a bit of trouble with open-iscsi on kernel 2.6.22.18 from
Debian backports; I seem to be able to log in to my storage array, but
when I log out, iscsiadm (and later modprobe) seem to hang forever.
I've filed a Debian bug report about this at
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=466954, and attached
a bug report in Linux kernel bug report format (since it's quite
large, I didn't paste it inline).  This is a production system, but
I've got some ability to muck with it on weekends and such, so I can
try more recent vanilla/git kernels if that will help with the
debugging.
  It seems that the iSCSI system in the kernels I've been trying is
not very mature; I note that http://www.open-iscsi.org/ says, "Stable
What other issues are you hitting. They might be fixed in the new release or we might still need a bug report. Let me know. 


releases: not available yet."  I had been planning to put this into
production -- is iSCSI in a state such that that's a reasonable goal,
or should I just be planning to return this hardware and/or find an
alternative way of interfacing with it?
  Thanks.
This one was the fault of the upstream kernel changing behavior on us, and not iscsi.
It is fixed in 2.6.25-rc2, and the kernel modules in the current rc release: 
http://www.open-iscsi.org/bits/open-iscsi-2.0-868-rc1.tar.gz
To work around the problem you have to disable write caching on the target (not all targets can do this though).
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