Slow data transfer from hdd to hdd (same controller) in the VM

Hi there,

i pass my HDDs via qm set ... scsi to my virtual machine (openmediavault). If i move a file (mainly larger than 5 GB) from HDD a to HDD b the speed is very slow (~25 MB/s). The HDDs are mounted under "/media/" - which is the standard mount point if you mount HDDs via the web gui of the OMV. The filesystem is NTFS (maybe thats the main reason? - i cant believe it)

Does anybody know what can be the problem there?

The Controller is SATAII/III onboard and both HDD are SATAII devices.

Thanks so far!