On 04/25/2014 11:54 PM, Cheng Cheng wrote: > Hi Mike, > > Thanks for replying. > >> 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. > > Here is what I am going to propose: > > 1. I am now trying to extend iscsistart to be capable send logout > command. > 2. In runlevel 0 and runlevel 6, after remounting the root FS as > read-only, use pivot_root and chroot to change the root to a ramfs, > similar to initramfs, which is loaded with iscsistart. Then we can > logout gracefully by invoking iscsistart. > > Please let me know what do you think of this. > It is nice to logout but it is not going to fix your problem. If you are getting stuck at the sync cache stage then your network probably went down. /sbin/shutdown probably shutdown the network on you. -- You received this message because you are subscribed to the Google Groups "open-iscsi" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/open-iscsi. For more options, visit https://groups.google.com/d/optout.
