Thanks Deepak, one more question: Can we export a FUSE mounted volume (on gluster client) to be a NAS backend ? thus the client can act as a NAS server with file distribution capability. Bill ???: Deepak C Shetty [mailto:deepakcs at linux.vnet.ibm.com] ????: Wednesday, March 14, 2012 11:44 PM ???: Bill Bao ??: gluster-users at gluster.org ??: Re: does Gluster support O_DIRECT ? On 03/14/2012 07:29 AM, Bill Bao wrote: This might be a question asked before, but I just couldn?t effectively search the whole archives, So please bear me and kindly advise. We have a 3rd party application (video streaming kind of) which uses directIO (O_DIRECT). On the server side, in the posix translator, we added the ?option o-direct enable? On the client side, we mounted as ?mount -t glusterfs -o direct-io-mode=enable server1:/test-volume /mnt/glusterfs? But the application still fails with error (cannot create/open file with O_DIRECT). Then we trace to the fuse module in the kernel, which has following checking: int fuse_open_common(struct inode *inode, struct file *file, bool isdir) { struct fuse_conn *fc = get_fuse_conn(inode); int err; /* VFS checks this, but only _after_ ->open() */ if (file->f_flags & O_DIRECT) return -EINVAL; err = generic_file_open(inode, file); looks like regardless what we configure on the gluster side, the FUSE still rejects the O_DIRECT. Could someone shed light ? we?re also trying to take out the O_DIRECT checking in FUSE module, to see what will happen, will report soon. Bill Bao O_DIRECT support for fuse was added recently. Check the fsdevel archives. _______________________________________________ Gluster-users mailing list Gluster-users at gluster.org http://gluster.org/cgi-bin/mailman/listinfo/gluster-users -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://gluster.org/pipermail/gluster-users/attachments/20120315/9e9e24e2/attachment.htm>
