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My server freezes for several seconds
Check if you are running other applications on the same box; memory or CPU intensive applications can push out OpenAMQ for several seconds, causing unpredictable latencies. For serious production work we recommend giving OpenAMQ its own box.
Several OpenAMQ servers all freeze together, for as long as minute!
Woah! That sounds like you put the logging onto a centralized NFS server, which went down for a few minutes. While OpenAMQ is multithreaded, disk i/o is synchronous and if several logging threads all have to wait for an NFS server to come back up, the whole messaging core can grind to a halt. It's probably a very bad idea to put logging on a remote machine. Our advice is to log locally, and use scheduled scripts ("cron jobs") to compress and copy logs across to a shared NFS disk, if needed, at off-peak moments.