MSA 2062 DP+ Datastore Presentation to VMWare 7

[SCG1]

Good Day All,

I can't seem to find a raid calculator for DP+ Raids.   Let's say 12 1.8 TB drives in one DP+ RAID?   I used a raid calculator for raid 6(the closest I could find) and it came up with 21.6 TB Raw and 16.4 usable.  I don't need an exact number, just a ball park...or a least a formula/website I can use to calculate these things.

Also, is there documentation somewhere that verifies you can add HDs to the DP+ Raid for additional capacity?

Thanks!

[support_s]

System recommended content:

1. HPE MSA 2062 Storage Array - Overview

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[Cali · Accepted solution]

Here is the Sizer Link: HPE Ninja Online for MSA
and the result:

Cali

[SCG1]

Ok I didn't see that when I used the wizard...thank you!

[Sunitha_Mod]

Hello @SCG1,

We are glad to know your concern has been addressed. 

[JustinGawn]

Depending on the drive type, a capacity equal to the following should be reserved for sparing:

• SSDs: 1 drive in the first 24 drives, and an additional drive in every subsequent 1 to 24 drives (so you're rounding up - e.g. there would be 2 drives' worth of sparing in 25 to 48 drives, and 3 in 49 to 72)
• Enterprise HDDs: 2 drives in the first 24 drives, and an additional drive in every subsequent 1 to 24 drives
• Midline HDDs: 2 drives in the first 12 drives, and an additional drive in every subsequent 1 to 12 drives

After sparing, the remaining capacity is split 80% for data, and 20% for parity.

So in your example 12 x 1.8TB drives (assuming these are Enterprise HDDs):

• 2 x 1.8TB (3.6TB) reserved for sparing
• Take this 3.6TB from the overall disk footprint of 21.6TB = 18TB for data and parity
• Of that, 20% will be parity (3.6TB), leaving 14.4TB for data

Though if you're not wanting to go above 90% utilisation you'll want to multiply that by 0.9 (12.96TB) and in many cases it would be sensible to also leave 10% headroom within that for snapshots, so multiply by 0.9 again for a final 11.7TB for your VMs.

Regarding your drive addition question, yes, see 3rd question on page 6 here.