about iSCSI storage problem

[vsun]

Hello, I have a storage question for consultation. I used iscsi storage and checked "Use LUNs directly" to divide a large datastore to create virtual machines. In addition, there are also direct mount lun disks as virtual machine disks. Recently I find that the disk performance of the datastroe virtual machine is particularly low, and the performance of the direct LUN disk is not bad. Why is this?

 

[floh8]

How big is your LUN for the many VMs and how many are there?

 

[floh8]

I think your understanding about iscsi direct is wrong.
docu say:
Storage pool type: iscsidirect
This backend provides basically the same functionality as the Open-iSCSI backed, but uses a user-level library (package libiscsi2) to implement it.

 

[RolandK]

imho, "Use LUNs directly" does not have any relation to "iscsidirect"