Timothy, When asking questions it is helpful if you could specify the AFS client and server versions involved and the operating systems.
Jeffrey Altman On 6/21/2013 7:26 PM, Timothy Balcer wrote: > I have a tiny head scratcher... > > Tested this case: > > rsync 100 or so files every 5-10 minutes to an AFS volume which is > remote over a 100Mbit dedicated WAN (33ms ping times) > > with cache size = 500,000 > with chunksize = 19 > rsync -qau -timeout=60 --contimeout=30 <blah blah> > > first rsync after afs client restart shows 0.15 - 0.25 seconds to complete > > second, and subsequent rsync shows in excess of 30 seconds. It never > recovers to below one second. > > Tested some parms... Decreasing cache size to 50,000 AND decreasing > chunksize to 13 gives consistent performance below 0.3 seconds > > Increase cache size to 500m with chunksize 13 and the same behavior > occurs as before. > > This seems counter intuitive... the 100 or so files do not go over the > 500,000 block cache size. They are fairly small (10's to 100's of > kilobytes). Why would increasing cache size impact performance > Negatively in such a case? > > > -- > Timothy Balcer / IT Services > Telmate / San Francisco, CA > Direct / (415) 300-4313 > Customer Service / (800) 205-5510
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