Hi,

Does anyone know of a storage tier calculator, where I enter can enter

• X number of SSDs
• size of SSDs
• Y number of HDDs
• size of HDDs

And get results of total amount of storage space available and preferably also the size of the SSD tier and the size of the HDD tier based on my inputs?

Or even just the basic formula for working it out yourself?

Thanks!

• Edited by Trana010 Wednesday, June 24, 2015 4:57 AM

Hi,

You could use PowerShell to do this job. Please see this article:

Find "To add capacity to the SSD tier (Windows PowerShell)" part in it.

https://technet.microsoft.com/en-us/library/dn789160.aspx

The closest cmdlet is:

Get-StorageTier -VirtualDisk (Get-VirtualDisk -FriendlyName $StorageSpaceName) | Format-Table -Property FriendlyName,MediaType,Size -AutoSize

To get all available values in Property, run this cmdlet:

Get-StorageTier -VirtualDisk (Get-VirtualDisk -FriendlyName $StorageSpaceName) | get-member

Check out this TechEd Europe presentation and associated slide deck.  Formulas start about 15 slides in.

https://channel9.msdn.com/Events/TechEd/Europe/2014/CDP-B361

https://view.officeapps.live.com/op/view.aspx?src=http%3a%2f%2fvideo.ch9.ms%2fsessions%2fteched%2feu%2f2014%2fCDP-B361.pptx

Thanks EJ, your pptx was quite informative, but I couldn't honestly still find the simple answer to my question to be honest.

Basically here is my dilemma:

Do I purchase 4 SSDs @ 400GB each or do I purchase 4 SSDs @ 200GB each? 

To make my decision, I kinda just need to know how big either of those SSD tiers would be? Is it like a RAID5 with 1 drive fault tolerance where I "lose" 1 drive for 600GB vs 1200GB? Or is it more like a RAID10 with 1 drive fault tolerance for 400GB vs 800GB?

Or is it something else?

I understand I should be having JBODs and I should be calculcating this from a performance point over a storage size point. But with my existing infrastructure to minimize cost, this is what I have to work with.

Obviously bigger is better, but if I can get away with 4x200GB on the SSDs thats saving a lot of cost, but I can't make that decision without know what usable space I get out of those 4 disks on the SSD tier. If all I get is 200GB from the 4 (200GB) disks, than thats not enough and I need the 4x400GB SSDs. If I get 400GB thats borderline and if I get 600GB from the 4x200GB disks than thats great, I can save on costs to get those.