Hello, So Ceph devs final reply was: "ngx_write_fd() is just a write(), which, when interrupted by SIGALRM, fails with EINTR because SA_RESTART is not set. We can try digging further, but I think nginx should retry in this case." Let me know what do you think. Thanks, Vedran Posted at Nginx Forum: http://forum.nginx.org/read.php?2,260512,260540#msg-260540