On 03/04/2010 10:42 AM, Marc Grunberg wrote:
Hi
I am a newcomer on this group and I just own an 2xEquallogic PS6000
that I use on linux.
I am facing strange unwanted computer reboot using iscsi with this
Equallogic
This problem is easily reproducible on different hardware/software
combination.
the first computer is Debian 5/Lenny x86-64 with a Broadcom
Corporation NetXtreme II BCM5708 Gigabit Ethernet
the second one is Centos 5.4 x86-64 with Intel Corporation 82546GB
Gigabit Ethernet Controller (e1000 module)
booth are running up to date resease of open-iscsi/iscsi-initiator-
utils.
To make this strange behavior happens Equalogic disks have to be
mounted first.
Then the reboot comes when I unplug the computer's ethernet iscsi
cable from the switch. I have not made
exhaustive test but the disconnection is around 1 minute then
computers reboot (like reset) without shutting down and without any
log message !
If you have a FS mounted and then you disconnect the disk for longer
than you have set the node.session.timeo.replacement_timeout to the FS
is going to get IO errors and then probably panic and kill the system.
If you hook up a serial line or look in /var/log/messages do you see
something about IO errors, then FS errors, then a panic from the FS
(What FS are you using btw?)?
There also might be bug where I think the iscsi layer will fail the
session, disconnect the socket, and then fail IO upwards. But, the
network layer still has references to the IO's pages, and so when we
fail upwards the upper layers might be freeing the pages while the
network system still thinks it has a valid reference. This is just a
guess of what I have seen on a system reported in bugzilla. I have not
been able to replicate it here. And I think everyone is using refcounts
on the pages, so I do not think upper layers are just going to free the
page from under the network layer. I cannot get any info on the bug. If
you are not seeing panics from the FS let me know.
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