HP StorageWorks 4000/6000/8000 - Enterprise Virtual Arrays - Failover Policy and Failback Policy; Brocade 4 Gb SAN Switch for HP C-Class Bladesystem in Access Gateway Mode

25318a
Blade enclosure
with 16 servers
Server Bay 16
Server Bay 15
Server Bay 14
Server Bay 13
Server Bay 12
Server Bay 11
Server Bay 10
Server Bay 9
Server Bay 8
Server Bay 7
Server Bay 6
Server Bay 5
Server Bay 4
Server Bay 3
Server Bay 2
Server Bay 1
N_Port (host)
FC switch with
NPIV support
Server
1,2
9,10
3,4
11,12
5,6
13,14
7,8
15,16
Uplink
1
2
3
4
5
6
7
8
Default server to
uplink mapping (2:1)
c-Class BladeSystem
Access Gateway
F_Port (virtual)
Server HBA ports, N_Ports
F_Port (NPIV)
F_Port (NPIV)
F_Port (NPIV)
F_Port (NPIV)
F_Port (NPIV)
F_Port (NPIV)
F_Port (NPIV)
F_Port (NPIV)
N_Port (NPIV)
N_Port (NPIV)
Uplink 2
N_Port (NPIV)
Uplink 3
N_Port (NPIV)
Uplink 4
N_Port (NPIV)
Uplink 5
N_Port (NPIV)
Uplink 6
N_Port (NPIV)
Uplink 7
N_Port (NPIV)
Uplink 8
Uplink 1
c-Class BladeSystem Access Gateway
Figure 49 Brocade 4Gb SAN Switch for HP c-Class BladeSystem in Access Gateway mode
.
NOTE:
The uplink ports (N_Ports) in Figure 49 are from the AG, not the hosts.
Failover policy and failback policy
AG mode supports the failover and failback policies (enabled by default), which you can configure
on a per-port basis.
The failover policy enables automatic remapping of hosts to other online N_Ports, if N_Ports go offline.
It evenly distributes hosts among the available N_Ports. This policy ensures a smooth transition with
minimal traffic disruption when a link fails between an N_Port on the AG and an F_Port on the external
fabric.
The failback policy automatically routes hosts back to the original N_Ports when they come online.
NOTE:
When a failover or failback occurs, hosts must be logged back in to resume I/O.
Heterogeneous server rules190