HP MSA 2040 SAN Storage - Manual (Page 39)

Connecting two storage systems to replicate volumes 39
The diagram below shows host interface connections and replication, with I/O and replication occurring
on different networks. For optimal protection, use two switches. Connect two ports from each controller
module to the first switch to facilitate I/O traffic, and connect two ports from each controller module to the
second switch to facilitate replication. Using two switches in tandem avoids the potential single point of
failure inherent to using a single switch; however, if one switch fails, either I/O or replication will fail,
depending on which of the switches fails.
Figure 27 Connecting two storage systems for Remote Snap: multiple servers/switches/one location
Virtual Local Area Network (VLAN) and zoning can be employed to provide separate networks for iSCSI
and FC, respectively. Whether using a single switch or multiple switches for a particular interface, you can
create a VLAN or zone for I/O and a VLAN or zone for replication to isolate I/O traffic from replication
traffic. Since each switch would include both VLANs or zones, the configuration would function as multiple
networks.
Multiple servers/different networks/multiple switches
The diagram below shows the rear panel of two MSA 2040 SAN controller enclosures with both I/O and
replication occurring on different networks.
Figure 28 Connecting two storage systems for Remote Snap: multiple servers/switches/two locations
The diagram below also shows the rear-panel of two MSA 2040 SAN controller enclosures with both I/O
and replication occurring on different networks. This diagram represents two branch offices cabled to
enable disaster recovery and backup. In case of failure at either the local site or the remote site, you can
fail over the application to the available site.
6Gb/s S S A
6Gb/s S
S A
6Gb/s S S A
6Gb/s S
S A
MSA 2040 SAN Storage system MSA 2040 SAN Storage system
To host server(s)
I/O switch Switch
(replication)
6Gb/s S
S A
6Gb/s S S A
6Gb/s S
S A
6Gb/s S S A
Remote site "A"
Ethernet
WAN
I/O switch
To host servers
Remote site "B"
To host servers
I/O switch
Peer sites with failover
MSA 2040 SAN Storage system MSA 2040 SAN Storage system