Administrator Guide

Table Of Contents
Grouping iSCSI I/O Ports Using Fault Domains
Front-end ports are categorized into fault domains that identify allowed port movement when a controller reboots or a port fails.
Ports that belong to the same fault domain can fail over to each other because they have connectivity to the same resources.
NOTE: Fault domains cannot be added or modified on SCv2000 or SCv3000 series storage systems. Storage Center
creates and manages fault domains on these systems.
iSCSI VLAN Tagging Support
iSCSI ports in a fault domain can be configured to use a VLAN ID. For each Storage Center, one of two levels of VLAN
functionality is available depending on the Storage Center OS version, Storage Center controller model, and iSCSI hardware.
Basic VLAN functionality is referred to as single-VLAN tagging, and enhanced VLAN functionality is referred to as multi-VLAN
tagging.
Single-VLAN Tagging
If a Storage Center supports single-VLAN tagging, a maximum of 1 VLAN ID can be configured for each iSCSI I/O port. An iSCSI
I/O port can belong to only one fault domain, and all ports in the same fault domain use the same VLAN ID.
Single VLAN tagging is supported by all Storage Center versions compatible with Storage Manager.
Multi-VLAN Tagging
If a Storage Center supports multi-VLAN tagging, a maximum of 64 VLAN IDs can be configured for each iSCSI I/O port. An
iSCSI I/O port can belong to up to 64 fault domainsone for each VLAN.
Multi-VLAN tagging is supported by Storage Centers that meet the multi-VLAN tagging requirements.
Multi-VLAN Tagging Requirements
The following table lists the requirements that a Storage Center must meet to support multi-VLAN tagging.
Requirement
Description
Storage Center controller
model
Multi-VLAN Tagging is not supported on SCv3000 or SCv2000 storage systems.
Storage Center iSCSI I/O
card hardware
Chelsio T3, T5, or T6 iSCSI cards must be installed in the Storage Center.
Storage Center front-end
connectivity mode
The Storage Center iSCSI ports must be configured for virtual port mode. Legacy mode is not
supported.
Types of iSCSI Fault Domains
When a Storage Center meets the multi-VLAN tagging requirements, two types of iSCSI fault domains can be created.
Physical The first fault domain configured for a given set of iSCSI ports.
Physical fault domains do not require a VLAN ID, but can be configured to use a VLAN ID.
Physical fault domains support iSCSI replication to and from remote Storage Centers.
Virtual Subsequent VLAN fault domains configured for the same set of iSCSI ports are referred to as virtual fault domains.
Virtual fault domains must be assigned a VLAN ID.
Virtual fault domains do not support iSCSI replication.
Virtual fault domains do not support IPv6.
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Storage Center Maintenance