Cluster Shared Volume out of space

[0x9h3]

Dear all,

 

I need some advice please.

 

I've inherited a Server 2012r2 Hyper-V cluster connected to the san by iScsi (I know). The san is an HP StoreVirtual 4530 running raid6 with 4 volumes created for VM's, however the file server is sitting on a volume that has 380gb of space left out of a total space of 20tb. On this volume though there is 5tb of storage unallocated. I have tried to expand the volume on the host that's holding onto the disk but I get an error 'the volume cannot be extended because the number of clusters will exceed the maximum number of clusters supported by the file system. Unfortunately, I can't move the file server share vhdx files to other volumes on the cluster as there isn't enough space.

 

In HP StoreVirtual, I can edit the volume and 'Cluster Available Space' I still have 9.33TB free.

 

How am I best expanding the space on this volume please?

[dmj]

IIRC you have to increase the 'bytes per cluster' to one that will fit the larger disk. That's probably going to require reformatting the disk though, and if you are going to that much trouble you might as well use zfs.

[0x9h3]

Thanks, DMJ. I have moved to Veeam and cannot backup my file server because there isn't enough space on the volume...