Creating a FIxed 1TB VHDX drive  took  9-10 hours

Nadee Perer
Nadee Perer used Ask the Experts™
on
I have a single Hyper-v host and running two VM's.All the VM's are sitting in local storage
My local storage specs- (Lenovo 600 GB Hard Drive - SAS (12Gb/s SAS) - 3.5" Drive - Internal 15000rpm - Hot Swappable) drive with Raid 5.
My hosting OS Server 2016 running on 128 GB Lenovo Solid State Drive - SATA (SATA/600) - Internal - M.2.

I tried to create a Fixed 1TB VHDX drive and it took me 9-10 hours.

Just wanted to find out is this normal or something to do with my storage.
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Top Expert 2014

Commented:
It takes a long time as it zeroes out all blocks, but that is slower than normal. What controller do you have, what state is the cache battery and how many disks?

Author

Commented:
Storage Controller Name : ThinkSystem RAID 530-8i

Cacheless (not upgradeable)

 4 x 600 GB Hard Drive - SAS (12Gb/s SAS) - 3.5" Drives in Riad 5



server Model:Thinksystem SR530
7X08A03SNA
Top Expert 2014

Commented:
RAID 5 without cache so 4 I/Os per write, performance is about the same as a single disk. RAID 10 would be about than twice the speed.
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Author

Commented:
In your opinion this is nothing to do with the Raid card specs and the Hard drive specs.
any idea why it took so kind to creat a fixed disk?
Top Expert 2014
Commented:
The RAID card is a budget one and does not perform well with RAID 5. There;s nothing wrong with it. it is slow because it has no cache. There are other controllers available for that server that are more suitable for RAID 5 and 6.
Philip ElderTechnical Architect - HA/Compute/Storage

Commented:
For any VHDX larger than 250GB to 300GB we use dynamic VHDX files after creating all of the fixed ones so that the growth of the remaining large one remains contiguous. We would never create 1TB or larger fixed VHDX.

I have two very thorough EE articles on all things Hyper-V:

Some Hyper-V Hardware and Software Best Practices
Practical Hyper-V Performance Expectations

Author

Commented:
as you mention I did change the VHDX fixed to Dynamic and initiate the file transfer.
I couldn't access VM file server while transferring Data from the old server to my new Hyper-V VM. It took me 5-10 minutes to open file explorer

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