Bug 248157 - qdisk integration with watchdog daemon
qdisk integration with watchdog daemon
Product: Red Hat Enterprise Linux 5
Classification: Red Hat
Component: cman (Show other bugs)
All Linux
medium Severity medium
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Assigned To: Marek Grac
: Reopened
Depends On:
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Reported: 2007-07-13 10:56 EDT by Lon Hohberger
Modified: 2009-04-16 18:40 EDT (History)
2 users (show)

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Fixed In Version:
Doc Type: Bug Fix
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Last Closed: 2008-09-04 07:15:23 EDT
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RHEL 7.3 requirements from Atomic Host:
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Description Lon Hohberger 2007-07-13 10:56:25 EDT
Description of problem:

Qdisk does monitoring of external resources for a node in a cluster.  Of course,
so does the watchdog daemon.

The request is to allow qdisk to use the watchdog's internal status as the sole
heuristic for fitness for participation in the cluster - thereby reducing the
load as well as duplicate effort on the system.

Qdisk currently uses blind heuristics based on external means, which gives it
great flexibility.  The watchdog daemon uses internally-coded ones, which gives
it better operational capability in high-memory pressure or high-load situations.
Comment 1 Lon Hohberger 2007-07-24 10:07:13 EDT
This will require changes to the watchdog daemon.

Generally, what I'm after here is a way for other apps to read from the watchdog
daemon's internal state.
Comment 2 Lon Hohberger 2007-07-24 10:09:09 EDT
This functionality may already exist, however, the specifics are that it should
be a low-overhead method - like shared memory or something - so that we can be
as memory-neutral as possible (compared to a socket which allocates buffers, for
Comment 3 Kiersten (Kerri) Anderson 2007-11-05 18:26:18 EST
Moving this to 5.3 unless Marek has something ready.
Comment 6 Lon Hohberger 2008-09-04 07:15:23 EDT
This could be stabilizing to the watchdog daemon.
Comment 7 Lon Hohberger 2008-09-04 07:15:37 EDT
Er, destabilizing...

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