2016 Server Storage Spaces ReFS inconsistencies, explanation help requested

[tare55]

Hey guys I've been messing around with Windows Server 2016 TP 4 and I know that Microsoft have move their main file system to ReFS format. But I have been getting highly inconsistent results.

My current configuration is:

Dual Intel Xeon CPU e5-2670s
64 GB DDR single rank DIMM
24 Hitachi SAS SSDs - JBOD mode - through storage spaces

Here's a SQLio result of 24 drives, simple 24 columns raid 0:



compared to 8 drives, simple 8 columns raid 0:


Was wondering if any expert here can help a newbie out with an explanation what may be causing this issue. Could it be the memory? CPUs? Whether single rank or dual rank matters in this situation. Obviously, the OS is a technical preview but I'm just trying to figure out if it may be something else I may be missing out on.

Here's additional information if it may help:




24 drives

8 drives


Many Thanks for any feedback/information on this issue.

 

[cesmith9999]

so your question is: why is an 8 column simple VDisk faster than a 24 disk VDisk? in the same storage pool?

which HBA and what expander are you using?

Chris

 

[markpower28]

Try ntfs, see if that makes any difference. There are some performance issues with refs in 2012r2

 

[Naeblis]

so your question is: why is an 8 column simple VDisk faster than a 24 disk VDisk? in the same storage pool?

which HBA and what expander are you using?

Chris

No expander. And 3 hba flashed to IT mode

 

[Chuntzu]

I am having the same issue with refs and tp4. For fun take out one processor and run your perf tests using 16 threads then compare that to running 32 threads with 2 processors. My perf gets cut in half when using both processors. Switch to ntfs and bam no issue. This happened on server 201y r2 but much much worse. I need to open some sort of ticket with Microsoft to figure why that happens.

 

[ecosse]

Do Microsoft ever reply to tickets? Certainly their public forums you may as well post your question in a personals column. So 3 years I used ReFS on my media server. Over time I found out files that should have been the same size were different. No response from MS. No way to CHKDSK etc. Never touched it again. I would love to know if its now deemed "ready".