On 26.04.2011 19:04, Michael Tokarev wrote:
26.04.2011 18:46, Peter Lieven wrote:
[]
i recently saw some qemu-kvm 0.12.5 guests with scsi and this patch
applies crashing when
we updated our backend iscsi storages. (short interrupt in traffic flow,
iscsi disconnect + reconnect)
i always see:
lsi_scsi: error: ORDERED queue not implemented
and then either the maschine just hangs or it even aborts due to this
assertion:
qemu-kvm-0.12.5: /usr/src/qemu-kvm-0.12.5/hw/lsi53c895a.c:596:
lsi_reselect: Assertion `s->current == ((void *)0)' failed.
http://bugs.debian.org/613413 talks about this very issue too ;)
any ideas?
Unfortunately, no, except that it looks like scsi support is
not of production quality still.
Do you know a reliable way to reproduce the ORDERED queue not
implemented error?
I tried with 0.14.0, but I were not able to. I will now try with 0.12.5.
However in 0.14.0 I manage to freeze a VM when copying data from an SCSI
device and
then temporarely interrupt the connection to my iSCSI storage which is
used as backend
on the host. Strangely, I cannot reprocude this when I run qemu-kvm in
gdb. There I just
see some SIGPIPE errors, but when I continue everything is fine.
From what I read from the SCSI2 specs a target should either implement
all tagged queue
commands or none. If tagged queing is not supported it should send a
reject message, but
continue with the following command.
http://ldkelley.com/SCSI2/SCSI2/SCSI2-06.html#6.6.17
Can somebody who is more familiar with SCSI look into this? SCSI drive
support
seems to be serverly broken.
Peter
/mjt
