IBM MQ日志写入完整性

Question

In the Queue manager object we have a parameter under log section to define the log write integrity. What is the difference between SingleWrite , DoubleWrite and TripleWrite in IBM MQ log write integrity ? Please explain in detail.

Answer 1

LogWriteIntegrity is all about how the queue manager logger writes partial 4KB pages. Unless you are absolutely certain that your file system provides atomically written pages under all circumstances you should leave it at the default setting of TripleWrite . The option to set anything other than TripleWrite only exists because of a possible performance enhancement, however since partial pages should be rare with a queue manager with a good amount of concurrent work going on, it's not a big area for performance improvement, and a better way to improve the performance of your queue manager is to increase concurrency rather than the risks associated with changing this setting.

There is a very useful blog post from MQ Development that you should read. You can find it here: LogWriteIntegrity.... should I pick SingleWrite or TripleWrite?