Failed all 3 nodes
I've create new bucket (with name "log") and after few minutes (not right after creation of bucket) ALL 3 NODES with very important information became "down".
Please, somebody, if you have some time, explain me, what's happened.
Diagnostic log: https://dl.dropbox.com/u/63808427/ns-diag-20130227092906.zip
I will reboot servers now, because I don't know what can I do else.