15k and 10k Hdd on Hiper-v Server

kaxrimanvk used Ask the Experts™
Hi experts,
I am about to purchase an HP DL380 server for a customer. This server is ….coming along with 2x300GB SAS SFF 15K/12G drivers, on a Smart Array P440ar/2GB FBWC storage controller. I was planning of purchasing another 3X300GB 10K/6G drivers so I make two arrays, one with raid 1, using the 2 x 10k drives and one with raid5 using the 3 x 10k drives. I was planning to setup a Hypervisor server on the raid1, to host an application server (putting the application server drive on the raid1) and to create a second host as a file server putting the hdd drive of that server on the raid5 array. Is all that a good idea? Am I going to use all disk in their higher possible performance ? or the system will run as fast as the 10k disks, making the 15k disks work slower than they could. Shall I purchase a 1X300GB 15k disk, instead of 3X300Gb 10k disks (because that’s the cost relation..) and just create one raid 5 array to host everything? … ( and loose the storage space..).
Thank you in advance
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JohnBusiness Consultant (Owner)
Most Valuable Expert 2012
Expert of the Year 2018

Use 15K RPM disks everywhere on this system. I would not mix and match. You might have issues, but the best you could hope for is reduced performance.
Andrew Hancock (VMware vExpert / EE Fellow)VMware and Virtualization Consultant
Fellow 2018
Expert of the Year 2017

Create a RAID 1 for your OS, and create a RAID 6 for your Data (VMs).

If you can afford 10k, use all 10k, if you have the option of 15k, use all 15k, but you may want to use 10k for RAID1 OS, and 15k for RAID 6 OS.
Technical Architect - HA/Compute/Storage
We would aim towards filling all hot swap bays (usually 8 these days for SFF) with 10K SAS and setting up one RAID 6 array.

That RAID 6 array would be carved up into two logical disks:
 75GB for host OS
 Balance for VHDX and Configuration Files

We do this to keep the host OS separate in the event that we need to flatten and re-install the OS. After doing so, and setting up our host we can then import the VMs on the second partition and be no further behind.

I have an EE article here: Some Hyper-V Hardware and Software Best Practices that may answer some additional questions.

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