With FlexAttach, you can perform the following tasks without the need to make SAN or storage
configuration changes:
Preconfiguration—You can preconfigure the SAN for the addition of new servers whose WWPNs
are unknown, using the virtual WWPNs. Once the servers are available, you can bring them online
and into the fabric.
Replacement (new server)—You can replace an existing server with a new server. FlexAttach assigns
a virtual WWPN to the server port.
Replacement (spare server)—You can bring a spare server online by moving the virtual WWPN
from the current server port to the spare server port.
Server redeployment—You can move a server to a different NPV switch (in the same fabric or
VSAN). FlexAttach allows you to manually create and transfer virtual WWPNs from one server
port to another server port.
NOTE:
Other tasks may require configuration changes. For more information about FlexAttach, see the Cisco
MDS 9000 Family CLI Configuration Guide . The terms pWWN and WWPN are used interchangeably.
Figure 53
shows a view of an HP c-Class BladeSystem using NPV with FlexAttach.
Blade server
management
Blade 1
Blade 2
Blade 3
Blade 4
Blade 5
Blade 6
Blade 7
Blade 8
Blade 9
Blade 10
Blade 11
Blade 12
Blade 13
Blade 14
Blade 15
Blade 16
Blade enclosure
with 16 servers
Figure 53 Cisco MDS 9124e Fabric Switch for HP c-Class BladeSystem using NPV with FlexAttach
.
SAN
management
c-Class N_Port Virtualization
MDS 9124e NPV mode
HBA
aggregator
Server-to-uplink
mapping (2:1)
Uplink 1
F_Port (NPIV)
N_Port (NPIV)
Uplink 2
F_Port (NPIV)
N_Port (NPIV)
Uplink 3
F_Port (NPIV)
N_Port (NPIV)
Uplink 4
F_Port (NPIV)
N_Port (NPIV)
Uplink 5
F_Port (NPIV)
N_Port (NPIV)
Uplink 6
F_Port (NPIV)
N_Port (NPIV)
Uplink 7
F_Port (NPIV)
N_Port (NPIV)
Uplink 8
F_Port (NPIV)
N_Port (NPIV)
VC switch with
NPIV support
26468a
SAN Design Reference Guide
195
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