Hi, I am developing an application in C and it opens, reads, writes and closes many files, kind of like a custom database. I am using Linux's io_submit() system call, so all the read()/write() operations are asynchronous. But I don't know about the open() system call, so I have the following questions to the group: 1) Will the open() block if Ceph's cluster goes off line completely ? I understand the write() or read() will, but I am not worried because it is done with io_submit(), no locking will occur in my application. 2) Will I experience some delay during the execution of open() system call even if it is called with O_NONBLIOCK flag and Ceph's cluster working without failures ? Thanks in advance Nulik
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