Red Hat Bugzilla – Bug 1014857
[Broadcom 6.4 but] Writes to multipath FC disk resulted in 'Operation not permitted' during link toggle test
Last modified: 2015-10-14 12:17:06 EDT
Description of problem:
In the midst of removing and re-establishing multipath FC disks (via FCoE), the multipathd daemon marked the disk to read-only (DISK_RO=1) for an extended period of time which led to 'Operation not permitted' failures in the disk-write application. Note that for this specific case, the link toggle was caused by the HP interconnect reboot test.
Version-Release number of selected component (if applicable):
This was observed with the device-mapper-multipath under RHEL6.4 GA
Reproducible after 3-4 hours of testing
Steps to Reproduce:
1. Establish FCoE disks with multipath
2. Continuously do write I/Os to the disks
3. toggle remote FC links
After a few hours of testing, the test application will fail with the 'Operation not permitted' message for the failed write command due to the disk being marked RO.
In this multipath environment, there's always a path to the FC disk. So for every link toggle event, the multipathd daemon should be able to react and change the path accordingly.
Created attachment 806809 [details]
multipathd log which contains the 'DISK_RO=1' message
Created attachment 806810 [details]
corresponding message log
Created attachment 806811 [details]
Application error log with 'Operation not permitted'
This looks like it might be a dup of Bug #958091. The issue is that whenever multipath fails reloading a table, it retried read-only. In case a device was read-only. The fix for Bug #958091, was to only try this reload if the table-load failed with an error of EROFS. Can you please try the latest packages (device-mapper-multipath-0.4.9-71.el6) available at:
and let me know if this resolves the issue.
Thanks, Ben. We are still working to verify your patch. I'll be sure to keep you posted on our findings.
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I'm pretty sure this is a dup, as mentioned in Comment 5. It's been two years, with no response from the reporter on verifying this, so I'm closing the bug.
*** This bug has been marked as a duplicate of bug 958091 ***