4 Posts
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1479
May 25th, 2020 00:00
Where is my space?
Hello.
I have a problem with pool capacity presented to hyper-v hosts
I got recently installed and configured new PowerVault ME4024 storage with 12 SAS SSD 960GB and 12 SAS HDD 1,2TB.
I've created 2 disk groups: 1-st with all SSD's and 2-nd with all HDD's.
Each RAID6 with dedicated hot spare. So total capacity should be around ((12-2-1)*1,2+(12-2-1)*0,96) 19,44TB
Then I've created pool of these two disk groups, and then a volume from that pool (full size).
The volume shows total capacity of 19,3TB just as it should.
But when I presented this pool to a hyper-v host (Win Srv 2019 Core) it shows 17,6TB capacity
So there's 1,7TB missed somewhere. But where?...
Or should I ask on MS Tech forum?
DELL-Sam L
Moderator
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7.7K Posts
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May 26th, 2020 12:00
Hello nekalyan,
Here is a link to Dell EMC PowerVault ME4 Series and Microsoft Hyper-V, I would double check to make sure that you have deployed your system to best practices as stated in this guide. If you are still seeing a loss of 1.7 TB then I would look into Microsoft issue.
https://dell.to/3c4t8iH
Please let us know if you have any other questions.
nekalyan
4 Posts
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May 27th, 2020 23:00
Hello DELL-Sam L
Thanks, but I've read this guide before deploying the storage and have applied it's advices
I'll ask for microsoft support tnen
Metzge
1 Rookie
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13 Posts
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June 7th, 2020 18:00
Vmware hosts do the same thing. The discrepancies in size is due to how you calculate what a TB is. Either based on the decimal or binary definition. It would appear the host is calculating a TB to be binary 2 to the 40 which is 1, 099,511,627,776 bytes, and the ME4024 is calculating a TB to be 10 to the 12th which is 1,000,000,000,000 bytes.
Why does the ME4024 do it this way when the older SCv2020 did it the other way? Seems to confuse things a lot.
Metzge
1 Rookie
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13 Posts
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June 7th, 2020 18:00
Also you can change this in the system settings, manage users, and change base preference to base 2. Logout of the web gui and back in and it will update.