RAID -- Stripe Element Size / disk array ?

What "Stripe Element Size" do you recommend for the below ?
  ** maybe 64k ?

What "RAID 10 CONFIG" do you recommend for the
below Dell PowerEdge T630 H730 RAID controller ?
  ** separate RAID 10 disk array for each VM
     or just one big RAID 10 disk array for ALL ?
======================================================
  HOST
    ** Windows 2012 R2

  VM #1
    ** Microsoft SQL 2012 with Reporting Services,
       lots of READING to summarize 365 days worth
       of HISTORICAL based on user submitted PARAMETERS

  VM #2
    ** Microsoft SQL 2012 with Reporting Services,
       lots of READING to summarize 365 days worth
       of HISTORICAL based on user submitted PARAMETERS

  VM #3
    ** Microsoft SQL 2012 with Reporting Services,
       lots of READING to summarize 365 days worth
       of HISTORICAL based on user submitted PARAMETERS
======================================================
http://www.computerweekly.com/RAID-chunk-size-the-key-to-RAID-striping-performance says if you want big I/O requests, you should opt for smaller RAID chunk sizes, and if I/O will be small, you should go for larger chunks. For use cases such as databases and email servers, you should go for a bigger RAID chunk size, say, 64 KB or larger.

http://www.pcguide.com/ref/hdd/perf/raid/concepts/perfStripe-c.html says as stripe size is decreased, files are broken into smaller and smaller pieces. This increases the number of drives that an average file will use to hold all the blocks containing the data of that file, theoretically increasing transfer performance, but decreasing positioning performance.
finance_teacherAsked:
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Muhammad BurhanManager I.T.Commented:
Yes, you should go with the 1 Virtual disk containing all of the physical disk at Raid 10.
after initializing all of the disks, it gives you better fault tolerance. And then make partitions, usually the smaller one for HOST OS and rest of the space is for VMs.
if any of your SAS drive fails you still have a feature to run your system and it will re-initialize when you replace that faulty disk.

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Carlos IjalbaIT Systems DirectorCommented:
Hi,

You would never create a separate RAID per VM, you just create one big RAID for a DataStore, and then hold all your VMs in the DataStore.

Otherwise, you would waste lots of disk space, and gain nothing.
Carlos IjalbaIT Systems DirectorCommented:
Also better leave the default stripe size, which in Dell is 64K.
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