Bug 167973
| Summary: | iscsi reload can hang during "iscsi-rescan" if targets are unreachable | ||||||
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| Product: | Red Hat Enterprise Linux 4 | Reporter: | Dave Wysochanski <davidw> | ||||
| Component: | iscsi-initiator-utils | Assignee: | Mike Christie <mchristi> | ||||
| Status: | CLOSED ERRATA | QA Contact: | |||||
| Severity: | medium | Docs Contact: | |||||
| Priority: | medium | ||||||
| Version: | 4.0 | CC: | coughlan, davidw | ||||
| Target Milestone: | --- | ||||||
| Target Release: | --- | ||||||
| Hardware: | All | ||||||
| OS: | Linux | ||||||
| Whiteboard: | |||||||
| Fixed In Version: | RHBA-2006-0495 | Doc Type: | Bug Fix | ||||
| Doc Text: | Story Points: | --- | |||||
| Clone Of: | Environment: | ||||||
| Last Closed: | 2006-08-10 21:53:41 UTC | Type: | --- | ||||
| Regression: | --- | Mount Type: | --- | ||||
| Documentation: | --- | CRM: | |||||
| Verified Versions: | Category: | --- | |||||
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |||||
| Cloudforms Team: | --- | Target Upstream Version: | |||||
| Embargoed: | |||||||
| Bug Depends On: | |||||||
| Bug Blocks: | 181409 | ||||||
| Attachments: |
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Created attachment 118667 [details]
iscsi-kill-session
*** This bug has been marked as a duplicate of 167946 *** This bug is to add the iscsi-kill-session script created by Netapp to U4. This is a dulpicate of BZ 167946, but for that BZ we did a fix for the rescan part in U3. This bug is to get the second part of the fix into U4. An advisory has been issued which should help the problem described in this bug report. This report is therefore being closed with a resolution of ERRATA. For more information on the solution and/or where to find the updated files, please follow the link below. You may reopen this bug report if the solution does not work for you. http://rhn.redhat.com/errata/RHBA-2006-0495.html |
Description of problem: If any targets are unreachable, and you try an "iscsi reload", the command will hang indefinately. I came up with another simple script that issues the kill session command, and seems to work ok in the session hangs I found. I'll attach the script and let you all decide whether you think this is ok to include or not - seems to meet my needs but you may have issues with including it. Also, for this particular problem, there may be other more elegant solutions but I thought the simple script was worth mentioning since it solved my problems. Note that the README states how to shutdown sessions (see below), but having a simple utility do it seems worth considering. Note that any configuration changes will not affect existing target sessions. For example, removal of a DiscoveryAddress entry from /etc/iscsi.conf will not cause the removal of sessions to targets discovered through this DiscoveryAddress, but it will cause the removal of the discovery session corresponding to the deleted DiscoveryAddress. To remove these sessions execute the following for each of these sessions: - Set ConnFailTimeout, ResetTimeout and AbortTimeout on the session to a low value, like 5 seconds through sysfs by executing the following commands: echo 5 > /sys/class/scsi_host/host<host_no>/connfail_timeout echo 5 > /sys/class/scsi_host/host<host_no>/reset_timeout echo 5 > /sys/class/scsi_host/host<host_no>/abort_timeout - Stop IOs to all the devices discovered through the session. - If these devices have been mounted, unmount them. - Shutdown the session through sysfs by executing the following command: echo > /sys/class/scsi_host/host<host_no>/shutdown where <host_no> is the Host Number of the session that has to be removed. Version-Release number of selected component (if applicable): iscsi-initiator-utils-4.0.3.0-2 How reproducible: Every time Steps to Reproduce: 1. Enter DiscoveryAddress=IP1 into /etc/iscsi.conf 2. /etc/init.d/iscsi start 3. Add DiscoveryAddress=IP2 in /etc/iscsi.conf 4. Somehow make target on IP1 unreachable (pull cable, stop iscsi on target side, etc) 5. /etc/init.d/iscsi reload *command hang* Actual results: "/etc/init.d/iscsi reload" hangs indefinately Expected results: "/etc/init.d/iscsi reload" should not hang indefinately Additional info: