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quorum: Add quorum mechanism.

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This patchset enables the core of the quorum mechanism.
The num_children reads are compared to get the majority version and if this
version exists more than threshold times the guest won't see the error at all.

If a block is corrupted or if an error occurs during an IO or if the quorum
cannot be established QMP events are used to report to the management.

Use gnutls's SHA-256 to compare versions.

--enable-quorum must be used to enable the feature.

Signed-off-by: Benoit Canet <benoit@irqsave.net>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Benoît Canet 2014-02-21 22:21:15 +01:00 • committed by Kevin Wolf
parent 7db6982a19
commit 95c6bff356
6 changed files with 467 additions and 2 deletions
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2
include/monitor/monitor.h
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@ -49,6 +49,8 @@ typedef enum MonitorEvent {
QEVENT_SPICE_MIGRATE_COMPLETED,
QEVENT_GUEST_PANICKED,
QEVENT_BLOCK_IMAGE_CORRUPTED,
QEVENT_QUORUM_FAILURE,
QEVENT_QUORUM_REPORT_BAD,
/* Add to 'monitor_event_names' array in monitor.c when
* defining new events here */