troubleshooting Question

How to expand a Windows File Server Volume which has default Cluster Size or allocation unit size?

Avatar of cgeorgeisaac
cgeorgeisaacFlag for United States of America asked on
Windows OSWindows Server 2019
7 Comments1 Solution14 ViewsLast Modified:
We have a few Windows 2019 File Servers in production mode which already has 15TB Volume Size. However, when I tried to expand it to 25TB it gave me an error "The Volume cannot be extended because the number of clusters will exceed the maximum number of clusters supported by the  file system".

On deeper analysis I found out the "Bytes per Cluster" was set to default i.e 4K and the maximum size it can be expanded is only 16TB. The only option seems to  REFORMAT this volume and select  a  higher "Allocation Unit Size" eg. 64K (for upto 256 TB).  The problem is I cannot Reformat these production Volumes.

I seek Experts advice as to the best approach to "expand" or "fix" this issue without formatting or not much impact to production please. Since these are File Servers with permissions and DFS-N configuration set in place.

Thanks in advance.
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