Editing fault domains (fc and iscsi tabs only) – Dell Compellent Series 40 User Manual
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Storage Center 5.5 System Manager User Guide
System Management
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Edit Virtual Ports (FC and iSCSI tabs with Virtual Ports licensed): See
Ports (FC and iSCSI only if licensed) on page 206
.
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Reset Defaults (all tabs): See
Resetting Default Port Settings on page 208
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Cancel (all tabs): Click to close the wizard.
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Assign Now (all tabs): Click to assign the current configuration and close the wizard.
Editing Fault Domains (FC and iSCSI tabs only)
Select the Edit Fault Domains button to create, modify, or delete fault domains for the
selected transport.
Front end ports are categorized into Fault Domains that identify allowed port movement
when a controller or port fails. When working with Fault Domains, you should be aware of
the following concepts:
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In dual-controller Legacy Operational Mode:
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Primary ports are designated for data traffic.
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Reserved ports assume the data load transfer.
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In the event of a failed primary port, reserved ports are also used for Inter-Process
Communication (IPC) traffic and Replication.
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Fault domains group primary and reserved front end ports to each another.
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Primary and reserved ports are assigned the same Fault Domain ID (an arbitrary
number) to designate where traffic will be moved in the event of a failover or
rebalance.
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In Virtual Port Operational Mode:
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A Virtual Port's Fault Domain value is changed automatically when the Preferred
Physical Port's Fault Domain is changed or when the Virtual Port is moved to a new
Preferred Physical Port. This greatly simplifies activities such as merging fault
domains.
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Front-End ports of the same transport type (iSCSI or FC) can be in a single Fault
Domain.
Caution
For iSCSI only, servers initiate IO to iSCSI ports through the Fault Domain’s
Control Port. If an iSCSI port moves to a different Fault Domain, its Control Port
will change. This change will disrupt any service initiated through the previous
Control Port. If an iSCSI port moves to a different Fault Domain, you must
reconfigure the server-side iSCSI initiators before service can be resumed.
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Although each Virtual Port is assigned a preferred Physical port, in the event of any
failure, a Virtual Port can fail over to another Physical port within the Fault Domain.
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With multi-pathing software on a server, volumes can be mapped to ports in more than
one Fault Domain. To use multi-pathing, make sure that the server has software, such
as MPIO, to manage multi-pathing.
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To reduce network broadcast interference, configure Storage Center Ethernet and
iSCSI ports into a separate VLAN.