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172 Storage Center 5.5 System Manager User Guide
Controllers
Each Storage Center iSCSI I/O card can be configured with VLAN identifier (VID). When a
VID is configured, Storage Center becomes an end station in the VLAN.
Outbound / Inbound Ethernet Frames
When VLAN tagging is enabled, all outbound Ethernet frames are tagged. When VLAN
tagging is not enabled, all outbound Ethernet frames are untagged. If the card is plugged
into a switch that has been configured with a VLAN, the switch inserts the VID into the
untagged Ethernet frame. When VLAN tagging is enabled, all inbound Ethernet frames
must be tagged and the VID must match the configured VID for that interface. If the inbound
Ethernet frame does not match the configured VID, the frame is discarded. Discarding
frames is called VLAN filtering. When VLAN tagging is disabled, the inbound Ethernet
frame must be untagged; otherwise Ethernet frame is discarded.
To enable VLAN tagging
1 In the system tree, select an iSCSI card.
2 From the shortcut menu, select Properties. The IO Card Properties window appears.
3 Select Enable VLAN Tagging.
4 Enter a VLAN ID (VID) to match the configured VID on the switch, from 1 to 4095.
5 Enter a user priority number. In the event of congestion, this gives a priority to the VLAN.
Zero is the lowest priority and seven is the highest.
6 Click OK.
Changing Advanced iSCSI Card Properties
1 In the system tree, select an iSCSI card.
2 From the shortcut menu, select Properties. The IO Card Properties window appears.
3 Click Advanced. The Advance IO Card Properties window appears:
4 The Port number is TCP port number. The default iSCSI port number is 3260 but you
can change it if there is a special requirement to use a different TCP port number.
5 iSCSI Header Digest enables a digest (32 bit CRC) on all iSCSI headers. An ISCSI Data
Digest enables a digest (32 bit CRC) on all iSCSI data Protocol Data Units (PDUs).
Select any of the following:
• Window size: from 32 to 2048 KB
• Keep alive timeout: from 5 seconds to 18 hours
• SCSI command data timeout: from 5 seconds to 18 hours
• Default time to wait: from 1 second to 10 minutes
• Default time to retain: from 1 second to 10 minutes.
• Enable Immediate Write Data: skips all digests and writes all data as it occurs.
6 Click OK.