Change The Cnc Port Mode; Connecting Two Storage Systems To Replicate Volumes - Seagate RealStor 5005 Series Hardware Installation

If communication with the CLI is disrupted when using an out-of-band cable connection, communication can sometimes
be restored by disconnecting and reattaching the mini-USB CLI cable as described in

Change the CNC port mode

This subsection applies to 5005/4005 Series FC/iSCSI models only. While the USB cable is still connected and the
terminal emulator session remains active, perform the following steps to change the CNC port mode from the default
setting (FC), to either iSCSI or FC-and-iSCSI used in combination.
When using FC SFPs and iSCSI SFPs in combination, host ports 0 and 1 are set to FC (either both 16Gb/s or both 8Gb/s),
and host ports 2 and 3 must be set to iSCSI (either both 10GbE or both 1Gb/s).
Set CNC port mode to iSCSI
To set the CNC port mode for use with iSCSI SFPs, run the following CLI command at the command prompt:
set host-port-mode iSCSI
The command notifies you that it will change host port configuration, stop I/O, and restart both controllers. When asked
if you want to continue, enter y to change the host port mode to use iSCSI SFPs.
Once the CLI set host-port-mode command completes, it will notify you that the specified system host port mode was
set, and that the command completed successfully.
Continue with
Set CNC port mode to FC and iSCSI
To set the CNC port mode for use with FC SFPs and iSCSI SFPs in combination, run the following CLI command at the
command prompt:
set host-port-mode FC-and-iSCSI
The command notifies you that it will change host port configuration, stop I/O, and restart both controllers. When asked
if you want to continue, enter y to change the host port mode to use FC and iSCSI SFPs.
Once the CLI set host-port-mode command completes, it will notify you that the specified system host port mode was
set, and that the command completed successfully.
Continue with

Connecting two storage systems to replicate volumes

Replication is a licensed feature for disaster recovery. The replication feature performs asynchronous replication of
block-level data from a volume in a primary system to a volume in a secondary system by creating an internal snapshot of
the primary volume, and copying the snapshot data to the secondary system via iSCSI links.
The two associated standard volumes form a replication set, and only the primary volume (source of data) can be
mapped for access by a server. Both systems must be licensed to use the replication feature, and must be connected
through switches to the same fabric or network (i.e., no direct attach). The server accessing the replication set need only
be connected to the primary system. If the primary system goes offline, a connected server can access the replicated data
from the secondary system.
Replication configuration possibilities are many, and can be cabled—in switch attach fashion—to support the CNC-based
iSCSI systems on the same network, or on physically split networks (SAS and FC systems do not support replication). As
you consider the physical connections of your system—specifically connections for replication—keep several important
points in mind:
• Ensure that controllers have connectivity between systems, whether local or remote.
• Although all qualified CNC options support host connection, only iSCSI supports replication.
• Assign specific ports for replication whenever possible. By specifically assigning ports available for replication, you
free the controller from scanning and assigning the ports at the time replication is performed.
step 11 of "Setting network port IP addresses using the CLI port and cable" (page
step 11 of "Setting network port IP addresses using the CLI port and cable" (page
step 2
Connecting two storage systems to replicate volumes
and Figure 36 (page 49).
48).
48).
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