User Manual

Advanced Functions
5-5
• Clustered MPIO Host Computers
For clustered host computers sharing single RAID system, the storage is to
be accessed simultaneously by all host computers. In such case, one host
group should be created for all host computers, and a host group should
include all HBA ports on all clustered host computers. So, all host
computers can have the same LUN mappings from all paths.
Figure 5-27 illustrates two clustered servers sharing single RAID system with
multi-path I/O. Both servers see the same two LUNs (DG0LD0 and
DG0LD1), each of which has two paths.
Add WWPN of HBAs to hosts HBA0 WWPN -> Host 0
HBA1 WWPN -> Host 1
HBA2 WWPN -> Host 2
HBA3 WWPN -> Host 3
Add hosts to each host group Host 0 and Host 1 -> Host Group 0
Host 2 and Host 3 -> Host Group 1
Map LUNs to host groups DG0LD0 and DG0LD1 -> Host Group 0
DG1LD0 and DG1LD1 -> Host Group 1
1 2 3 4 5 6
1 2 3 4 5 6
7 8 9 10 11 12
7 8 9 10 11 12
Server1
(with Pathguard installed)
FCP1FCP2FCP2 FCP1
Server2
(with Pathguard installed)
WWPN
WWPN
WWPN
WWPN
Storage Group
(for Host Group 0)
LAN
LUN0
(DG0LD0)
LUN1
(DG0LD1)
LUN2
(DG1LD0)
LUN3
(DG1LD1)
HBA1
HBA0
HBA3
HBA2
Host Group 0
Fibre Switch
(SAN)
Figure 5-2 Clustered server environment