Bug 600395 - allow_kill does not prevent eviction via disk
Summary: allow_kill does not prevent eviction via disk
Status: CLOSED DUPLICATE of bug 602731
Alias: None
Product: Red Hat Enterprise Linux 5
Classification: Red Hat
Component: cman
Version: 5.5
Hardware: All
OS: Linux
low
medium
Target Milestone: rc
: ---
Assignee: Lon Hohberger
QA Contact: Cluster QE
URL:
Whiteboard:
Keywords:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2010-06-04 15:54 UTC by Lon Hohberger
Modified: 2011-01-25 15:11 UTC (History)
4 users (show)

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Clone Of:
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Last Closed: 2011-01-25 15:11:50 UTC


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Description Lon Hohberger 2010-06-04 15:54:13 UTC
Description of problem:

When you set allow_kill to 0, the qdiskd master no longer asks CMAN to evict/fence the presumed-dead host.  However, it will still write an eviction notice to disk.  If the presumed-dead host reads in the eviction notice, it will reboot itself.

If storage is flaky (for example, exhibiting long delays for I/O), users may wish to disable all qdiskd failure-recovery actions in order to sabilize the cluster - this includes both CMAN *and* disk eviction.

Today, the former is possible, but the latter is not.

We need the ability to disable disk-based eviction.

Comment 1 Lon Hohberger 2010-06-04 15:56:07 UTC
There are two possibilities:

1) Simply do not write eviction notices, or

2) Do not act on eviction notices by reboot -- instead, restart qdiskd with a new incarnation #.

Comment 4 Lon Hohberger 2011-01-25 15:11:50 UTC

*** This bug has been marked as a duplicate of bug 602731 ***


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