hi
indeed its jumbo frame problem. ping from storage to esxi host until mtu size 8400 works but above MTU size 8400 or higer fails
so still wondering what it could be
- the switches are on 9126 MTU (flexfabric)
- the storage interface are on MTU 9000
- vswitch for iSCSI is on MTU 9000
- VMkernel ports of the iSCSI switch are set on MTU 9000
but now we have measured the db Loss on the fiber and have 4db loss on our fiber patch cords. so im going to replace those first and test again in 2 weeks in a weekend.
any other sugestions are still welcome
with regards