iSCSI mount from VM or from host OS: which is better?

Question

VMware

What is available:
1) On the one hand, there is a Storage that shares the partition via iSCSI
2) On the other hand, there is VmWare ESXi with a Windows VM inside
Everything is on the same network.

There are two options:
1) Format the partition as NTFS and mount it via iSCSI using Windows Server
2) Format the partition as VMFS and mount it via iSCSI as a VmWare ESXI resource. Next, we create Wirth there. disk and connect it to the VM

Question: which option is better: in terms of I / O speed, performance?

Answer 1

Depends on what speeds you have in bottlenecks.
Ceteris paribus, IMHO, the first option is more viable, there are fewer levels of abstraction.
The storage gives the target, which works as a block device. If you give it to iSCSI ESX, and then create a virtual disk there, then the Changes will go through two levels - the abstraction level of the virtual disk and the abstraction level of connecting storage to ESX. If directly by means of Windows, then only one level, SCSI signaling through the target network.
But in general, I would test both, and measure the timeouts of operations. There is a chance that the difference will not be very noticeable.