I figured it out.
Will post here just for someone who try something like this.
User manual
Virtual Drive Expansion Commands The StorCLI utility supports the
following commands for virtual drive expansion:
storcli /cx/vx expand size=<value> [expandarray]
storcli /cx/vx|vall show expansion
The
detailed description for each command follows.
storcli /cx/vx expand size=<value> [expandarray]
This command expands the virtual drive
within the existing array or if you replace the drives with drives
larger than the size of the existing array. Although the value
provided might be in MB, the value of the expanded size is displayed
based on the nearest possible unit. Depending on the input (value)
provided by you, storcli recognizes the size from the input provided
by you and rounds up the size to the nearest percentage of free space
remaining on the drive group; hence, the actual expanded size can
differ from the size requested by you. If the expandarray option is
specified, the existing array is expanded. If this option is not
specified, the virtual drive is expanded.
storcli /cx/vx show expansion
This command shows the expansion information on the virtual
drive with and without array expansion.
Input example: storcli /c0/v0 show expansion
Windows> .\storcli64.exe /c0/v0 show expansion
EXPANSION INFORMATION :
=====================
---------------------------------------------
VD Size OCE NoArrExp WithArrExp Status
---------------------------------------------
0 232.830 GB Y - 213.272 GB -
So I have 213 GB free, and will use 190 of them ( the value provided might be in MB)
.\storcli64.exe /c0/v0 expand size=190000 expandarray
CLI Version = 007.1704.0000.0000 Jan 16, 2021
Operating system = Windows Server 2008 R2
Controller = 0
Status = Success
Description = expansion operation succeeded
EXPANSION RESULT :
================
---------------------------------------------
VD Size FreSpc ReqSize AbsUsrSz %FreSpc NewSize Status
---------------------------------------------
0 232.830 GB 213.272 GB 185.546 GB 185.546 GB 87 418.376 GB -
---------------------------------------------
VD=Virtual Drive/Logical Drive | Size - Current VD size | FreSpc - Freespace available before expansion
ReqSize - Requested Size | %FreSpc - Requested expansion size in % of available free space
AbsUsrSz - User size rounded to nearest % | NoArrExp - Without Array Expansion
and just to check results again
\Windows> .\storcli64.exe /c0/v0 show expansion
EXPANSION INFORMATION :
=====================
---------------------------------------------
VD Size OCE NoArrExp WithArrExp Status
---------------------------------------------
0 418.376 GB N - - -
---------------------------------------------
OCE - Online Capacity Expansion | WithArrExp - With Array Expansion
VD=Virtual Drive | NoArrExp - Without Array Expansion