520 IBM Midrange System Storage Hardware Guide
If jumbo frames have been enabled and performance appears to be substantially less than
expected, disabling jumbo frames on the DS5000 storage subsystem is a simple and quick
troubleshooting step, as shown in Figure B-3. We found that, based on empirical tests of
several varieties of iSCSI HBAs, that using jumbo frames led to, on occasion, degraded
performance.
Figure B-3 Jumbo frames enabled on the iSCSI host port
Virtual Local Area Networks
Virtual Local Area Networks (VLANs) are a grouping of devices that communicate on the
same broadcast network, even though they might be physically separate. A VLAN has the
same basic characteristics of a normal LAN, but it allows for a greater degree of flexibility
within a networked infrastructure, and it allows reconfiguration using software instead of
physical movement of devices.
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