I''ve gotten hit with four "lock callback timer expired" events in the past week. The logs from one event are attached. I recently upgraded from 1.8.3 to 1.8.5. On 1.8.3 the error had only occurred once. Now, four times in a week. Looking through bugzilla, I thought it might be 23190 and 23963. But then I took note of the following line. Does this mean it''s the backend storage? INFO: task jbd2/sdj-8:10577 blocked for more than 120 seconds. Any ideas? Thanks! -Joe -------------- next part -------------- A non-text attachment was scrubbed... Name: client.log Type: application/octet-stream Size: 3738 bytes Desc: not available Url : http://lists.lustre.org/pipermail/lustre-discuss/attachments/20110218/d66fd58e/attachment-0002.obj -------------- next part -------------- A non-text attachment was scrubbed... Name: oss1.log Type: application/octet-stream Size: 33884 bytes Desc: not available Url : http://lists.lustre.org/pipermail/lustre-discuss/attachments/20110218/d66fd58e/attachment-0003.obj