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Revision 95c6bff3

ID95c6bff3561eedaf7c7de287bc4a002720605a8d

Added by Benoît Canet about 10 years ago

quorum: Add quorum mechanism.

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 <>
Reviewed-by: Max Reitz <>
Signed-off-by: Kevin Wolf <>

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