Windows 10: How to PROPERLY adjust storage space size (maximum) after adding drive

Ok, let's get some requirements of this post out of the way, as it's irrelevant and I've always had this issue but only joined tenforums.com just now to seek advice from other Windows 10 users:

Microsoft Windows 10 Pro, 64-bit, Version 1909 (OS Build 18363.657)

But I must repeat, I've ALWAYS had this problem after adding a drive, and the solution seemed to be always move everything out of the existing storage space and delete, and re-create. So here is my question:

How do you properly adjust the storage space size (maximum) field once you add new drives to a pool? I've read the sticky post from Brink, and although I appreciate the tutorial, it didn't show anything of value in my situation. Seems like everytime I tried to address this issue, I'm playing a game of "guess my storage space size (maximum)" with Windows. My Pool and Storage Space situation is simple:

1) I created a storage space and planned ahead knowing that I will be adding drives to my pool later once those drives were freed up. "Planning ahead" meant, over-provision the pool so that the correct cluster size will be implemented in the creation of this Pool to at least guarantee that I won't get the dreaded "exceed the size cluster" error message.

2) The pool I created, has the size set to 40TB

3) Initial creation of the the Storage Space in THIS 40TB pool (Item 2 above) is 4x 6TB drives, totalling to 24TB.

4) This Storage Space has NOTHING SPECIAL. Just SIMPLE, no resiliency, it's just used to store a bunch of data that are disposable and "don't-care" if I lost all the volume (although it would be annoying, but it's not critical data).

5) I added two FRESH drives, 8TB each, after removal from another pool. I removed the disks, deleted the pool where it came from, and went into Mini-Tools Partitition Wizard to remove any garbage partition that Windows leaves behind after a drive removal. So the ENTIRE DRIVE after the Partitition Wizard shows as Unused, no partition, so 8TB raw space per drive.

6) After adding the two raw drives to the existing Pool (See item 3 for reference), I went back into that Storage Space and clicked on "Change" to change the attribute of this Storage Space.

7) Please see attached screenshot for reference. In the field "Storage Space Size (maximum)" this is where the guessing-game begins. I tried to type in value of what's shown in the "Total Pool Capacity" but I get the error message "Specified size is not valid" and with "Change storage space" greyed-out so I cannot execute this change.


So back to the general question, lots of info on the web about HOW to change the storage size, but I haven't found ANY that explains how to do it PROPERLY, to adjust this Storage Space to the maximum. Even on MS' own forums, the MS reps on there seems to dodge this question posed on there by asking the scripted questions like "What is your machine's configuration, did you make sure to apply the latest patch, etc." Bunch of unhelpful replies.

But I've been a lurker on here for years and know that there are some Windows 10 power users that probably knows how to solve this. I would appreciate any help.

Oh yeah, I did run into a post about using DISPART and EXTEND VOLUME # (where # is the volume number in the list after listing the volumes out with list volume command).




:)

 

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