Service manual

This is because the Nearline system has no media database to support “movies” or “clips”, such as

there is on an “online” K2 SAN. However, the les on a Nearline system can be readily available

to an online K2 system via FTP transfer.

The redundant Nearline SAN has two Ethernet switches, connected by Inter-Switch Links (ISLs)

to support a redundant Ethernet fabric.

The SAN also has two 10 Gig NH K2 Media Servers. The NH server for a Nearline system has two

ports for Fibre Channel connections. NH servers do not have media (iSCSI) ports.

A NH server on a Nearline system is congured with roles of FTP server and Media le system

server. On a redundant system these roles are identical on both servers and provide redundancy as

follows:

• FTP server — Both servers are active in this role simultaneously. To provide FTP redundancy

in the event of a server failure, your facility’s FTP system must be able to access alternate FTP

servers.

• Media le system server — Only one server is active at any one time in this role, and the media

le system provides redundancy. If a fault occurs on the active server, one of the other servers

automatically takes over as the active media le system server.

In the Nearline system no K2 Media Servers take the role of iSCSI bridge or media database server.

No K2 clients or any other generic client are part of the Nearline system.

7.2K SAS drives provide the media le storage on a Nearline system. While these drives do not

provide the high bandwidth of the drives required by an online K2 SAN, they offer larger capacity

and lower cost. This makes these drives ideal for the Nearline SAN.

The primary RAID chassis has two controllers. The primary RAID chassis is connected via Fibre

Channel to the NH server. These Fibre Channel connections access the disks simultaneously for

redundancy and increased bandwidth. Each controller in the RAID chassis must also be connected

to the GigE control network.

There must be one primary RAID chassis and there may be optional Expansion chassis. Primary

chassis and Expansion chassis contain twelve 3.5 inch drives. All disks in both primary and optional

Expansion chassis are bound as RAID 6.

The K2Cong control point PC is connected to the GigE control network. The K2Cong application

runs on this PC for conguring the SAN. The SiteCong application also runs on this PC.