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4 VMware ESXi 5.5 – 6.5 Host Configuration | Rapid EqualLogic Configuration Series | Implementation Guide | REC4004
2 Enable flow control on iSCSI NICs
The following procedure requires physical or remote SSH access to the server. Refer to VMware KB article
101790 for more information on using the ESXi console in Tech Support Mode.
1. At the ESXi console, type: esxcli nic pauseParams list
2. The available NICs, support for pause parameters, and each NICs RX and TX pause parameter
setting are among the information displayed.
3. Determine which vnmics are assigned to adapters used for SAN connectivity, and confirm both Pasue
RX and Pause TX are set to true.
4. If RX and TX are shown as true, proceed to section 3, as no further action is needed.
If one or both are showing false, execute the following steps:
a. At the ESXi console, type: vi /etc/rc.local.d/local.sh
b. Type the letter o (lowercase) to append a new line to the file.
c. Type: ethtool --pause vmnic# tx on rx on (substitute the # that corresponds to the
NICs connected to the SAN identified in the steps above) and press [Enter].
Repeat this for each NIC that is connected to the SAN before proceeding to the next step.
5. Press [Esc] and type the following:
:wq
6. Press [Enter] to save the file.
7. Restart the system to apply the changes.
For more information, refer to VMware KB article 1013413.