June | 2017

To configure a local device as an RDM disk:

Open an SSH session to the ESXi host.
Run this command to list the disks that are attached to the ESXi host:
```
ls -l /vmfs/devices/disks
```
From the list, identify the local device you want to configure as an RDM and copy the device name.
Note: The device name is likely be prefixed with t10. and look similar to: t10.F405E46494C4540046F455B64787D285941707D203F45765
To configure the device as an RDM and output the RDM pointer file to your chosen destination, run this command:
```
vmkfstools -z /vmfs/devices/disks/diskname /vmfs/volumes/datastorename/vmfolder/vmname.vmdk
```

For example:

vmkfstools -z /vmfs/devices/disks/t10.F405E46494C4540046F455B64787D285941707D203F45765 /vmfs/volumes/Datastore2/localrdm1/localrdm1.vmdk

Linux:

ping -M do -s 8972 xxx.xxx.xxx.xxx

OSX/BSD:

ping -D -s 8184 xxx.xxx.xxx.xxx

Windows:

ping -f -l 9000 xxx.xxx.xxx.xxx

Example results on Linux

If you’ve forgotten to enable jumbo frames/9k MTU on your client device you’re sending the ping from:

PING xxx.xxx.xxx.xxx (xxx.xxx.xxx.xxx): 8184 data bytes
ping: sendto: Message too long

If you have enabled jumbo frames on your client but not the destination (or a switch in between):

PING xxx.xxx.xxx.xxx (xxx.xxx.xxx.xxx): 8184 data bytes
Request timeout for icmp_seq 0

If you’ve done everything righ:

PING xxx.xxx.xxx.xxx (xxx.xxx.xxx.xxx): 8184 data bytes
8192 bytes from xxx.xxx.xxx.xxx: icmp_seq=0 ttl=128 time=0.714 ms