If a hardware error causes data to be unreadable, WebSphere MQ can still be recovered by using the media recovery technique:
The more recent your backup copy, the more quickly your subsystem can be made available again.
When the queue manager restarts, it uses the archive logs to reinstate changes made since the backup copy was taken. You must keep sufficient archive logs to enable WebSphere MQ to reinstate the changes fully. Do not delete archive logs until there is a backup copy that includes all the changes in the log.
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