Hello, On Mon, 12 Mar 2012 16:33:55 -0400 John Chandy wrote: > Jim, > > I can provide some answers to the fuse question. In principle, the fuse > module in PVFS works the same way as the kernel module - i.e. there is still > a user to kernel back to userspace transition. The tests that we did (about > 4 years ago) showed that pvfs2fuse had similar performance to the kernel > module as long as the block size was less than 128K.
I tested the orangefs-2.8.5 fuse client on Linux-3.0.10 recently. It looks limited in functionality compared to the kernel module: 1) chmod on any file fails: $ chmod 0755 test.file chmod: changing permissions of `test.file': Invalid argument 2) If you multiple pvfs2-servers are running on the same node, they will have different config files due to different data/meta directories, log file and so on. The fuse client checks sizes and checksums of all server's configs and refuse to start if they are different. pvfs2-client powered by the kernel module works fine in this case. I haven't performed speed tests for fuse client. Limitations above are sufficient for me to make a choise between two clients. Best regards, Andrew Savchenko
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