The 20s metrics return valid results, even for extended periods of time, but the 300s result sets are always empty:
irb(main):163:0> pm.retrieve_stats([hosts[2]], ['cpu.usagemhz'], {max_samples: 72, interval: '300', start_time: '2013-07-30 10:25:00PM'})
=> {HostSystem("host-254")=>{:sampleInfo=>[#<RbVmomi::VIM::PerfSampleInfo:0x00000004750540 @props={:dynamicProperty=>[], :timestamp=>2013-07-30 22:30:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003a83e48 @props={:dynamicProperty=>[], :timestamp=>2013-07-30 22:35:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003c32050 @props={:dynamicProperty=>[], :timestamp=>2013-07-30 22:40:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003642f00 @props={:dynamicProperty=>[], :timestamp=>2013-07-30 22:45:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003a08b30 @props={:dynamicProperty=>[], :timestamp=>2013-07-30 22:50:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000002f763e8 @props={:dynamicProperty=>[], :timestamp=>2013-07-30 22:55:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x0000000334bfe0 @props={:dynamicProperty=>[], :timestamp=>2013-07-30 23:00:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003490220 @props={:dynamicProperty=>[], :timestamp=>2013-07-30 23:05:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x000000037e4a70 @props={:dynamicProperty=>[], :timestamp=>2013-07-30 23:10:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x000000036c2b10 @props={:dynamicProperty=>[], :timestamp=>2013-07-30 23:15:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x000000034d6ae0 @props={:dynamicProperty=>[], :timestamp=>2013-07-30 23:20:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x000000034c0358 @props={:dynamicProperty=>[], :timestamp=>2013-07-30 23:25:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003bbbdd8 @props={:dynamicProperty=>[], :timestamp=>2013-07-30 23:30:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003bbe588 @props={:dynamicProperty=>[], :timestamp=>2013-07-30 23:35:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x000000033b2f10 @props={:dynamicProperty=>[], :timestamp=>2013-07-30 23:40:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x000000033b9810 @props={:dynamicProperty=>[], :timestamp=>2013-07-30 23:45:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x000000033c6858 @props={:dynamicProperty=>[], :timestamp=>2013-07-30 23:50:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x0000000345b638 @props={:dynamicProperty=>[], :timestamp=>2013-07-30 23:55:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x0000000346f958 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 00:00:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003475150 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 00:05:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x000000039fde88 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 00:10:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003a0b178 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 00:15:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x0000000378b420 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 00:20:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x000000037a0eb0 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 00:25:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003a722b0 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 00:30:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x000000034bd978 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 00:35:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x000000039cb320 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 00:40:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003376cb8 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 00:45:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x000000038a9140 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 00:50:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003950850 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 00:55:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003990428 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 01:00:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x000000038fc340 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 01:05:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003682420 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 01:10:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003718920 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 01:15:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003b06690 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 01:20:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003b0b028 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 01:25:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003b204a0 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 01:30:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x000000038543c0 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 01:35:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x0000000349c930 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 01:40:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x0000000372eb80 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 01:45:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x000000037232d0 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 01:50:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003ad6530 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 01:55:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003ad3628 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 02:00:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003ad8d58 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 02:05:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x000000039ed2b8 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 02:10:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x000000035cccb0 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 02:15:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003980848 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 02:20:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x000000039a8870 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 02:25:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x000000039adbb8 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 02:30:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x000000039aa468 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 02:35:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x000000036a6460 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 02:40:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x000000036f0100 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 02:45:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003906188 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 02:50:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x000000036082b0 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 02:55:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x000000036051f0 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 03:00:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x0000000360a1a0 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 03:05:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x0000000362a9c8 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 03:10:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003386e38 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 03:15:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x0000000338bfa0 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 03:20:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003388f58 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 03:25:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x000000036461c8 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 03:30:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x000000036431a8 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 03:35:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003a94428 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 03:40:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003a99608 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 03:45:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003c089a8 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 03:50:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003c05a50 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 03:55:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003c0e0d8 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 04:00:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x000000034319f0 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 04:05:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x000000036946c0 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 04:10:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003691380 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 04:15:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x000000036962b8 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 04:20:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x000000035509a8 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 04:25:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x0000000355c0a0 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 04:30:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003669510 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 04:35:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x000000036664a0 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 04:40:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003746d48 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 04:45:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x0000000374c158 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 04:50:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x000000035e79c0 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 04:55:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x000000035e4680 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 05:00:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x000000035edc08 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 05:05:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003b300f8 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 05:10:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003b3c150 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 05:15:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003b69498 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 05:20:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003b6f5a0 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 05:25:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003b6c788 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 05:30:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003a76428 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 05:35:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003a7c580 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 05:40:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003bdf378 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 05:45:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003bdc560 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 05:50:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003be1e48 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 05:55:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003bea5e8 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 06:00:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003be7668 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 06:05:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003bf5240 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 06:10:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003518d78 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 06:15:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003520b40 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 06:20:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003528368 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 06:25:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x0000000352cf80 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 06:30:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003529cb8 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 06:35:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x000000037f52f8 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 06:40:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x000000037fa168 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 06:45:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003807f70 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 06:50:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x0000000380f270 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 06:55:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x0000000380c070 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 07:00:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003814720 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 07:05:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x000000038c3db0 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 07:10:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x000000038ca818 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 07:15:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x000000038d9368 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 07:20:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x000000038d6528 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 07:25:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x000000038dcc48 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 07:30:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003b8b2f0 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 07:35:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003b90570 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 07:40:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003b8d578 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 07:45:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003b94a58 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 07:50:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003ba2608 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 07:55:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003ba8c38 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 08:00:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003ba5d80 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 08:05:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003c1ae00 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 08:10:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003c21b88 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 08:15:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003c33ae0 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 08:20:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003c30bb0 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 08:25:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003c35e30 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 08:30:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003c3da90 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 08:35:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003c3ac28 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 08:40:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003c484e0 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 08:45:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003c4e9d0 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 08:50:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003c605e0 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 08:55:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003c5d598 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 09:00:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003c627f0 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 09:05:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003c6a900 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 09:10:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003c78668 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 09:15:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003c758a0 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 09:20:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003c886f8 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 09:25:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003c7e928 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 09:30:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003ce4d90 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 09:35:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003ce1d20 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 09:40:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003cea678 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 09:45:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003cf79b8 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 09:50:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003d004f0 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 09:55:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003cfd688 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 10:00:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003d0abf8 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 10:05:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003d11700 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 10:10:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003d0e910 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 10:15:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003793c60 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 10:20:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003790d30 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 10:25:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003f2c9e0 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 10:30:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000004096290 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 10:35:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x000000045d05a8 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 10:40:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000004581228 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 10:45:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003e18d10 @props={:dynamicProperty=>[], :timestamp=>2013-07-31 10:50:00 UTC, :interval=>300}>, #<RbVmomi::VIM::PerfSampleInfo:0x00000003e15d18 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