Bug 196916
| Summary: | Multipath needs to interact with gnbd better | ||||||
|---|---|---|---|---|---|---|---|
| Product: | Red Hat Enterprise Linux 4 | Reporter: | Ben Marzinski <bmarzins> | ||||
| Component: | device-mapper-multipath | Assignee: | Ben Marzinski <bmarzins> | ||||
| Status: | CLOSED ERRATA | QA Contact: | |||||
| Severity: | medium | Docs Contact: | |||||
| Priority: | medium | ||||||
| Version: | 4.4 | CC: | agk, bmarzins, christophe.varoqui, dwysocha, egoggin, junichi.nomura, kueda, mbroz, tranlan | ||||
| Target Milestone: | --- | ||||||
| Target Release: | --- | ||||||
| Hardware: | All | ||||||
| OS: | Linux | ||||||
| Whiteboard: | |||||||
| Fixed In Version: | RHEA-2007-0256 | Doc Type: | Bug Fix | ||||
| Doc Text: | Story Points: | --- | |||||
| Clone Of: | Environment: | ||||||
| Last Closed: | 2007-05-01 17:41:18 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: | |||||||
| Attachments: |
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Created attachment 134728 [details]
patch for multipath.dev, so that multipath only monitors the correct devices
This patch fixes the first problem, where multipathd monitors unused gnbd
devices. Even with this patch, it is still necessary to modify the
multipath.conf file as described
Added these fixes to the multipath package Just to note, to apply the multipath_gnbd_update.patch from Comment #1 # patch -p0 -d /etc/dev.d/block/ < multipath_gnbd_update.patch This fix is in the latest snapshot. Please retest with the latest packages: device-mapper-multipath-0.4.5-21.RHEL4 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/RHEA-2007-0256.html |
There are two issues where multipath doesn't deal with gnbd devices well. 1. If multipathd is started before the gnbd module is loaded, multipathd starts monitoring all 128 possible gnbd devices. This get's rather annoying. Currently, the workaround for this is to either start or restart multipathd after the gnbd modules are loaded. The other possibility is to add the following multipathd should never monitor gnbd devices that aren't activated. 2. The default getuid callout for GNBD devices is "/sbin/gnbd_import -U /block/%n". Unfortunately, with this callout, if there are any warning messages printed while running the command, they will end up as part of the UID. This keeps the maps for correctly being set up. The default getuid needs to be "/sbin/gnbd_import -q -U /block/%n". As a workaround, people using gnbd can put the following in the /etc/multipath.conf: device { vendor "GNBD" product "GNBD" path_grouping_policy multibus getuid_callout "/sbin/gnbd_import -p -U /block/%n" path_checker directio }