On 04/26/2014 01:07 AM, Mike Christie wrote: > On 04/26/2014 01:05 AM, Mike Christie wrote: >> 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. >> > > When you hit this problem, on the console around the time you see the > sync cache sent do you then see a conn error 1011 error message? > > If you reconfig the cache settings on the target so a sync cache is not > needed do you hit this problem? >
As another test/workaround try deleting the scsi disks while the network is still up. So you are running in your root ramfs, then do echo 1 > /sys/block/sdXYZ/delete for the iscsi disks. Then let the kernel shutdown. -- 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.
