Hello!
There are lot of questions/factors which needs to be looked into in these kind of issues:
- Have you configured MTU 9000 on all the components between your NAS storage and your Esxi hosts. Like, physical switch, Virtual standard/distributed switch. The right way to do it is to make sure all the hops are configured with MTU 9000 aka jumbo frames in between your NAS storage and your esxi hosts.
- Have you updated the drivers/firmware of the iscsi adapter.
- I'd suggest you to use iscsi initiator and mount the iscsi LUN directly to your backup server and use that as your target for backups.
- You can also check and tweak que depths from inside the guest OS.
- What is the transport mode you are using to backup- NBD, HotAdd or SAN. If NBD what is your network speed 1G or 10G.
Let us know more information in order to analyze the issue efficiently.
Thanks ![]()