vmfs Benchmark changing over time

Question

I'm in the middle of migrating esx4 to 5 and did some benchmarks again. With SANHQ its nice to see whats going on on the san side. All benchmarks shows as expected without the reallife benchmark with vmdk files. I did the test on a new esx5 server with 2 san groups with one member each (ps3700 and ps4000) with MEM enabled and 4 gbit uplinks. I had the same issue on another host with different hardware to the same san groups (also esx5 and MEM + 4 uplinks). The first run on both was weird. At first it was slow with a queue depth of 1, but in the time it was going up. A second run just after the first showed better results. I did not had this with iscsi volumes inside the guest vm. 1st run: 2nd run: Anyone have a explanation? Its no big deal, because the other benchmarks all showed fine... some other screenshots: 100% read to 3700X 16x 400GB 10k SAS Raid 50 (with jumboframes): 100% read to 4000 16x 1TB 7200 SATA Raid 5 (without jumboframes):

sbuerger · Answer

1st run 2nd run PS3700 PS4000

sbuerger · Answer

Somehow all screenshots were gone... 1st run:

sbuerger · Answer

Forgot the link to the benchmark: http://vmktree.org/iometer/

sbuerger · Answer

Looks like its the way the vmdk is created. With lazy zeroed I get this slow first run with queue length 1. With eager zeroed its okay at the first time.

EqualLogic

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