SQL Server cluster locking failures

org.nuxeo.ecm.core.storage.StorageException: Could not insert: INSERT INTO [locks] ([id], [owner], [created]) VALUES (?, ?, ?)
	at org.nuxeo.ecm.core.storage.sql.jdbc.JDBCRowMapper.insertSimpleRows(JDBCRowMapper.java:579)
	at org.nuxeo.ecm.core.storage.sql.jdbc.JDBCMapper.setLock(JDBCMapper.java:1031)
	at org.nuxeo.ecm.core.storage.sql.LockManager$1.call(LockManager.java:221)
	at org.nuxeo.ecm.core.storage.sql.LockManager$1.call(LockManager.java:218)
	at org.nuxeo.ecm.core.storage.sql.LockManager.callInTransaction(LockManager.java:303)
	at org.nuxeo.ecm.core.storage.sql.LockManager.setLockInternal(LockManager.java:218)
	at org.nuxeo.ecm.core.storage.sql.LockManager.setLock(LockManager.java:165)
	at org.nuxeo.ecm.core.storage.sql.SessionImpl.setLock(SessionImpl.java:1085)
	at org.nuxeo.ecm.core.storage.sql.TestSQLBackend$LockingJob.doHeavyLockingJob(TestSQLBackend.java:2792)
	at org.nuxeo.ecm.core.storage.sql.TestSQLBackend$LockingJob.run(TestSQLBackend.java:2760)
	at java.lang.Thread.run(Thread.java:662)
Caused by: java.sql.BatchUpdateException: Snapshot isolation transaction aborted due to update conflict. You cannot use snapshot isolation to access table 'dbo.locks' directly or indirectly in database 'jabberwock' to update, delete, or insert the row that has been modified or deleted by another transaction. Retry the transaction or change the isolation level for the update/delete statement.
	at net.sourceforge.jtds.jdbc.JtdsStatement.executeBatch(JtdsStatement.java:947)
	at net.sourceforge.jtds.jdbcx.proxy.StatementProxy.executeBatch(StatementProxy.java:495)
	at org.nuxeo.ecm.core.storage.sql.jdbc.JDBCRowMapper.insertSimpleRows(JDBCRowMapper.java:564)
	... 10 more