Grass Valley K2 Summit Storage Area Network v.7.1 - Manual (Page 57)

26 October 2009 K2 Storage Area Network Installation and Service Manual 57
Media (iSCSI) network description
The streaming/FTP network applies to both online and nearline K2 SANs. For
nearline systems, this is the primary network for moving media to and from the
storage system.
Redundant K2 SANs have one streaming/FTP network with hardware separated into
an A side and a B side. There is an A Ethernet switch and a B Ethernet switch.
Switches are connected by InterSwitch Links (ISLs) to provide redundant paths for
streaming/FTP traffic.
Only those K2 devices that host a K2 FTP interface are on the streaming/FTP
network, as follows:
• K2 Media Servers — Those with the role of FTP server are connected via their
dedicated FTP port. On a redundant K2 SAN, if you have multiple K2 Media
Servers with role of FTP server, balance servers between the A and B sides.
• Stand-alone K2 clients — While not a part of a K2 SAN, stand-alone K2 clients
can also be on the streaming/FTP network. Connect to the dedicated FTP port.
NOTE: Shared storage K2 clients are not on the streaming/FTP network. They do
not have a FTP interface and they do not send or receive streaming/FTP traffic.
Automatic FTP server failover is not provided by the K2 SAN. If you require
automatic failover to a redundant FTP server for your streaming/FTP traffic, you must
provide it through your FTP application.
Media (iSCSI) network description
The media network is exclusively for real-time iSCSI traffic on a K2 SAN. It must be
on a different subnet than the control network and the streaming/FTP network.
Furthermore, its traffic is kept physically separate from that of other networks. This
separation is provided by dedicated ports, cables, and by a dedicated VLAN on the
Ethernet switch or by separate switches. Static IP addresses are required for the media
network. Name resolution is not necessary, so media network IP addresses are not
required in host files.
The media network applies to online K2 SANs. Nearline K2 SANs do not have a
media network.
Redundant K2 SANs have redundant media networks: an A media network and a B
media network. The two networks are on separate subnets and are also physically
separated onto the A Ethernet switch and the B Ethernet switch. InterSwitch Links
(ISLs) between switches do not carry media (iSCSI) traffic. ISLs provide redundant
paths for control network traffic and streaming/FTP network traffic only.
Devices are on the media network as follows:
• Shared Storage K2 client — On a non-redundant K2 SAN, the A media port
connects to the media network. On a redundant K2 SAN, the A media port connects
to the A media network and the B media port connects to the B media network.
• K2 Media Server — A server has one to four ports available for connection to a
media network. These are iSCSI interface adapters, each of which supports the
functionality of a TCP/IP Offload Engine (TOE). All the available media ports on
a single K2 Media Server always connect to a single media network. On a
redundant K2 SAN, one server is on the A media network and one server is on the