Messages in this thread | | | From | (G.W. Wettstein) | Date | Tue, 28 Sep 1999 10:14:19 -0500 | Subject | Anyone putzing with NBD besides me? |
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Good morning to everyone on the list.
Is anyone working with the Network Block Device driver (NBD) in 2.2.12. If so what type of luck are you having.
I grabbed the tarball of userland stuff from Pavel's site and have it up and running between a couple of SMP dual PII-450 systems. I can make a filesystem on the device and mount it and read/write files just fine.
Problems seem to occur when the device gets subjected to large amounts of I/O. In these cases the throughput goes way, way done. The slowdown can be pretty easily demonstrated by running Bonnie with a scratch filesize of 200-300 megabytes.
It smells like a client side (NBD) problem and it also appears to be a Heisenbug. When I turned on debugging in the server side utility the stalls went away but throughput was than poor due to the massive amounts of I/O being generated in the way of the debug information being printed.
I would be interested in the experiences that anyone has had or if there are a set of patches floating around which improve performance.
Thanks much and have a pleasant mid-week.
Greg
As always, Dr. G.W. Wettstein Enjellic Systems Development - Specializing 4206 N. 19th Ave. in information infra-structure solutions. Fargo, ND 58102 WWW: http://www.enjellic.com Phone: 701-281-4950 EMAIL: greg@enjellic.com ------------------------------------------------------------------------------ "A distributed system is one on which I cannot get any work done because a machine I have never heard of has crashed." -- Leslie Lamport
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