| 2016-01-27 22:14:06 |
Stuart Hopkins |
bug |
|
|
added bug |
| 2016-01-27 22:15:40 |
Stuart Hopkins |
affects |
saucy-backports |
multipath-tools (Ubuntu) |
|
| 2016-02-01 14:45:23 |
Mathieu Trudel-Lapierre |
nominated for series |
|
Ubuntu Trusty |
|
| 2016-02-01 14:45:23 |
Mathieu Trudel-Lapierre |
bug task added |
|
multipath-tools (Ubuntu Trusty) |
|
| 2016-02-01 14:45:57 |
Mathieu Trudel-Lapierre |
multipath-tools (Ubuntu): status |
New |
Fix Released |
|
| 2016-02-01 14:46:03 |
Mathieu Trudel-Lapierre |
multipath-tools (Ubuntu Trusty): status |
New |
In Progress |
|
| 2016-02-01 14:46:05 |
Mathieu Trudel-Lapierre |
multipath-tools (Ubuntu Trusty): importance |
Undecided |
Medium |
|
| 2016-02-01 14:46:07 |
Mathieu Trudel-Lapierre |
multipath-tools (Ubuntu Trusty): assignee |
|
Mathieu Trudel-Lapierre (mathieu-tl) |
|
| 2016-02-01 14:48:24 |
Mathieu Trudel-Lapierre |
description |
Release: Ubuntu 14.04.3 LTS
Kernel: linux-image-3.16.0-59-generic
A clean system installed fresh today (2016-01-27)
In attempting to configure a system to boot-from-SAN and enable multipath support I ran into an issue whereby despite the multiple paths being detected (when running the multipath command from the CLI) the configuration wasn't being enabled at boot. After examining /usr/share/initramfs-tools/scripts/local-top/multipath I found the following:
verbose && log_begin_msg "Waiting for scsi storage"
{ rmmod scsi_wait_scan ; modprobe scsi_wait_scan ; rmmod scsi_wait_scan ; } >/dev/null 2>&1
verbose && log_end_msg
The problem appears to be that the scsi_wait_scan module doesn't exist and so there is no wait before the multipath scan is performed. I managed to observe this briefly during bootup (with the script edited) and could see it performed the scan before sda/sdb was discovered.
I also found a debian bug report indicating the module was removed a while back (https://lists.debian.org/debian-kernel/2012/05/msg00791.html).
After adding in an artificial delay for testing the multipath command does what is expected and configures the paths accordingly. I'm not sure what the correct approach is if the scsi_wait_scan module is removed.
I also found that the same local-top script doesnt have the dm-round-robin module loaded (but it is included in the initrd by the associated hook script), however I'm not sure if that is by design. I know I need it for my specific use-case, but don't know if it is deliberately excluded to prevent breakage on SAN units that don't support native round-robin. |
[Impact]
Users of multipath may see an error message on every boot (when in verbose mode) about the scsi_wait_scan module being unavailable.
[Test case]
Boot 14.04 system with multipath-tools-boot. (Multipath devices installed, and the pacakge multipath-tools-boot installed).
[Regression Potential]
None. This module has been removed for a long while; as such this has no effect aside from removing an extra error message on boot.
------
Release: Ubuntu 14.04.3 LTS
Kernel: linux-image-3.16.0-59-generic
A clean system installed fresh today (2016-01-27)
In attempting to configure a system to boot-from-SAN and enable multipath support I ran into an issue whereby despite the multiple paths being detected (when running the multipath command from the CLI) the configuration wasn't being enabled at boot. After examining /usr/share/initramfs-tools/scripts/local-top/multipath I found the following:
verbose && log_begin_msg "Waiting for scsi storage"
{ rmmod scsi_wait_scan ; modprobe scsi_wait_scan ; rmmod scsi_wait_scan ; } >/dev/null 2>&1
verbose && log_end_msg
The problem appears to be that the scsi_wait_scan module doesn't exist and so there is no wait before the multipath scan is performed. I managed to observe this briefly during bootup (with the script edited) and could see it performed the scan before sda/sdb was discovered.
I also found a debian bug report indicating the module was removed a while back (https://lists.debian.org/debian-kernel/2012/05/msg00791.html).
After adding in an artificial delay for testing the multipath command does what is expected and configures the paths accordingly. I'm not sure what the correct approach is if the scsi_wait_scan module is removed.
I also found that the same local-top script doesnt have the dm-round-robin module loaded (but it is included in the initrd by the associated hook script), however I'm not sure if that is by design. I know I need it for my specific use-case, but don't know if it is deliberately excluded to prevent breakage on SAN units that don't support native round-robin. |
|
| 2016-02-01 16:51:34 |
Mathieu Trudel-Lapierre |
bug |
|
|
added subscriber Ubuntu Stable Release Updates Team |
| 2016-02-05 00:06:13 |
Brian Murray |
multipath-tools (Ubuntu Trusty): status |
In Progress |
Fix Committed |
|
| 2016-02-05 00:06:16 |
Brian Murray |
bug |
|
|
added subscriber SRU Verification |
| 2016-02-05 00:06:24 |
Brian Murray |
tags |
|
verification-needed |
|
| 2016-02-05 10:37:20 |
Stuart Hopkins |
tags |
verification-needed |
verification-done |
|
| 2016-02-11 19:09:03 |
Brian Murray |
tags |
verification-done |
|
|
| 2016-02-11 19:09:04 |
Brian Murray |
tags |
|
verification-needed |
|
| 2016-02-11 21:53:09 |
Mathieu Trudel-Lapierre |
tags |
verification-needed |
verification-done |
|
| 2016-02-15 23:15:28 |
Launchpad Janitor |
multipath-tools (Ubuntu Trusty): status |
Fix Committed |
Fix Released |
|
| 2016-02-15 23:16:04 |
Adam Conrad |
removed subscriber Ubuntu Stable Release Updates Team |
|
|
|
