Over 1 month ago I started to have have problems with free space on drive C: as it's suddenly started to decrease every day.
External tools like TreeSize od Dirstat weren't able to show what is "eating" space.
Finnaly it turned out that for some reason NTFS/MFT allocates enormous space, and it's freeing it up only after the server restart or within few minutes after somebody is logon via RDP session to the server.
Reserved space is visible via cmd line and attribute "Total Reserved clusters". Total reserved size when somebody is logon is aroud 44gb, but if I logoff and wait couple of hours, space occupied by reservation will increase by another few Gb's/.
I checked c: volume by running chkdsk, but is healthy. There are no quota settings on drive nor shadow copies set.
On the other Win2022 Server this NTFS occupying only around 1Gb, so where is the problem ?
Can you advise ??
This issue concerns: Windows Server 2022 Standard + Exchange 2019 (on-premise).
PS C:\Windows\system32> fsutil fsinfo ntfsinfo c:
NTFS Volume Serial Number : 0x0edc1ca0dc1c83dd
NTFS Version : 3.1
LFS Version : 2.0
Total Sectors : 429,705,215 (204.9 GB)
Total Clusters : 53,713,151 (204.9 GB)
Free Clusters : 27,462,030 (104.8 GB)
Total Reserved Clusters : 11,536,195 ( 44.0 GB)
Reserved For Storage Reserve : 0 ( 0.0 KB)
Bytes Per Sector : 512
Bytes Per Physical Sector : 512
Bytes Per Cluster : 4096 (4 KB)
Bytes Per FileRecord Segment : 1024
Clusters Per FileRecord Segment : 0
Mft Valid Data Length : 552.75 MB
Mft Start Lcn : 0x00000000000c0000
Mft2 Start Lcn : 0x0000000000000002
Mft Zone Start : 0x0000000002d20240
Mft Zone End : 0x0000000002d25180
MFT Zone Size : 79.25 MB
Max Device Trim Extent Count : 64
Max Device Trim Byte Count : 0x2000000
Max Volume Trim Extent Count : 62
Max Volume Trim Byte Count : 0x2000000
Resource Manager Identifier : 393C6EFA-7A42-11ED-BF42-AD3018B76F78