Hi,
Welcome to StarWind Forum. 2.5 Gbps ~ 315 MBps.
Several suggestions and questions from my side:
1. What is the underlying storage (Pass-through, RDM, VMDK)?
2. What is the iSCSI link bandwidth? Make sure you are not mixing the traffic.
3. What is the testing scenario? (likely to be a Windows-based VM)
4. Do not use teaming (see more at
https://forums.starwindsoftware.com/vie ... f=5&t=5285 and
https://www.starwindsoftware.com/best-p ... practices/)
5. iSCSI Initiator can be a bottleneck (see more at
https://www.starwindsoftware.com/blog/v ... ne-better/
6. How do you benchmark StarWind's VSAN performance? For Windows-based VM, connect the disk over iSCSI via Loopback (at least 3x loopback sessions+3x Partner connections; try local paths to be preferred while MPIO is set to Round Robin with Subset). For VMware VM, carry out cumulative tests in 4 VMs (should have at least 8xvCPUs and 8GB RAM each) simultaneously on StarWind HA datastore. See more at
https://www.starwindsoftware.com/best-p ... practices/.
7. Any caching involved?
8. Please use DiskSPD as it has way better flexibility of settings. What is the test file size by the way?
9. How do you add storage to StarWind VSAN VMs? (RDM, VMDK)
10. Remark to 6 and 9. Please note that a single VM's VMDK cannot saturate disk performance. Carry out cumulative tests or connect the storage from StarWind VM over iSCSI into the client VM using multiple iSCSI sessions.