>>>>> You should not have to logout the session. For Red Hat and I think
>>>>> SLES, when the system is shutting down the root FS gets mounted as
>>>>> read-only. iSCSI is left running. Eventually /sbin/shutdown is run and
>>>>> from there the kernel is shutdown and if needed the scsi layer might
>>>>> have the iscsi layer send some commands like a sync cache. So for this
>>>>> you just need to leave the network up.
>>>> I did some research today around this. For Debian, yes, the root FS will
>>>> be remounted as read-only before shutting down/rebooting. However, the
>>>> system will then stuck at sync cache, even I have left network running.
>>>> I have not looked into the Linux kernel to check whether iscsi layer
>>>> will send logout command to the target, but I highly suspect it won't.
>>> It will not logout of the target at this time. It cannot because
>>> userspace is shutdown and iscsid is what sends the logout request.
>>> A logout is *not* needed though. It is not what is causing your problem.
>>> For RHEL/OEL and SUSE we do not send a logout and it works fine.
>> The reason I need the logout operation is not only limited to a gracefully 
>> shutdown. I also want to have the tgt side have a clean record for the 
>> target.
> If you want to send a patch for iscsistart then that would be ok.

Okay, then I will try to work on iscsistart this weekend for logout. This 
problem should be specific to the case of using iscsi volume as root FS.


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