Thanks for the information Pavel
We have a support contract but the bug is filled already so
I assume Oracle is already working on it ;)
Thomas
On Mon, 28 Nov 2011, pavel filipensky - oracle wrote:
Hi Thomas,
this is likely a known problem:
6826477 NFSv4 can be much slower and more expensive than NFSv3 when creating
files at high concurrency
If you have a support contract you can contact Oracle for fixing this issue.
Regards,
Pavel
On 11/24/11 05:15 PM, Thomas Nau wrote:
Dear all
We recently ran a few tests using filebench with different workloads
such as varmail and others. In some cases, especially the varmail test
run, v3 performs much better than v4 with repect to the total number
of OPs handled per interval. We destroy the pool and reboot the server
after each test so there should be no dependency left. Also the
workload is big enough to fit into main memory for the client as well as
for the server. Given that we tend to use v3 for a few hundred clients
but honetsly, I expected v4 to be superior. Both client and server run
Solaris 11 with a few tweaks in /etc/system such as the number of
connections, ...
For example pre-allocating 80.000 files takes about 270 seconds in v3 versus
357
in NFSv4. The total IOs for a mix of create/delete/append/... ops are
v3:
IO Summary: 6894774 ops, 11490.8 ops/s, (1768/1768 r/w) 53.4mb/s,
662us cpu/op, 4.5ms latency
v4:
IO Summary: 3084085 ops, 5139.9 ops/s, (791/791 r/w) 30.1mb/s,
921us cpu/op, 10.1ms latency
Any hints or recommendations?
Thomas
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