sequential writing very slow use SAS 6/iR (LSI 1068E) and readers of SAS 15 k RPM on ESXi, run fast on a native installation of Win 2008

Hi gentlemen,

I'm having a problem on a Dell PowerEdge 2950 (quad core 2.66 ghz, 18 GB of ram) with my SAS drives with a very low write speed. The tests ran inside a virtual Windows XP machine using virtual thick 32 GB drive. I tried a single seagate 15 k RPM 500 GB and got 26 MB s, 2 of them in raid-0 and still got dry 26 MB, then I tried a different SAS 2.5 inch 10 k rpm HP and still got the same s 26MB.

This controller is a hardware raid, not the best around, but it's good for raid 1 and 0. Then I took off of ESXi machine and installed Windows 2008 re-usable. The disc written now 100 MB s sequentially on disk and using software raid 0 is 145 MB s. I'll configure hardware raid 0 tomorrow on Windows 2008 to check if the writing is a bit better.

But anyway, there seems to be a huge difference between a virtual machine in ESXi and a native machine running on these drives. I'll install VMware workstation on top of Windows 2008 and run tests with a virtual disk again thick.

It's very strange that all disks are capped at 26 MB s. The reading speed is also very low in raid 0. I get on Windows 2008 340 s MB, on ESXi I get 200.

The controller is not write far cache I have now as there is no battery on board. Can use Windows 2008 write cache on hard drives without any kind of system requirements for me? But even with or without write caching, it's so fresh generals to let fall a sequential read 340 to 200 MB on a xeon quad core with 12 MB of cache and SAS controller?

Thank you!

You cannot directly compare a stand-alone OS and a virtual one. There is more than just the write cache, but it can make a difference of 10 times in some environments (depending on controller, cache size, number of axes etc.).

If you search the forums you will find many many similar positions and invariably, the answer is battery and caching module.

http://communities.VMware.com/docs/doc-5490

Forum upgrade notice - we will be upgrading systems VMware communities between December 10-12, 2010. During this time, the system will be placed in READ ONLY mode.

Tags: VMware

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