Grass Valley K2 Summit Storage Area Network v.7.1 - Manual (Page 52)

52 K2 Storage Area Network Installation and Service Manual 26 October 2009
Chapter 1 Product Description
The non-redundant Nearline SAN has one Gigabit Ethernet switch. The redundant
Nearline SAN has two Gigabit Ethernet switches, connected by Inter-Switch Links
(ISLs) to support a redundant Ethernet fabric.
The SAN has one (non-redundant) or two (redundant) NH K2 Media Servers. These
can be NH1 (one Gig FTP bandwidth) or NH1-10GE (ten Gig FTP bandwidth)
servers, but all NH servers on a system must be of the same type: either all NH1 or all
NH1-10GE. 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 configured with roles of FTP server and Media
file system server. On a redundant system these roles are identical on both servers and
provide redundancy as follows:
• FTP server — On a redundant system 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 file system server — On a redundant system only one server is active at any
one time in this role, and the media file system provides redundancy. If a fault
occurs on the active server, one of the other servers automatically takes over as the
active media file 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.
SATA drives provide the primary media file storage on a Nearline system. While
these drives do not provide the high bandwidth of the SAS drives required by an
online K2 SAN, they offer larger capacity and lower cost. This makes SATA drives
ideal for the Nearline SAN.
The primary RAID chassis has one controller (NL10) or two controllers (NL10R).
The primary RAID chassis is connected via Fibre Channel to the NH server. In the
redundant system, these Fibre Channel connections access the disks simultaneously
for increased bandwidth. Each controller in the RAID chassis is also connected to the
GigE control network, which is required for SNMP (NetCentral) monitoring.
There must be one primary RAID chassis and may be up to six optional Expansion
chassis. Primary chassis and Expansion chassis contain twelve SATA drives. All
disks (SATA) in both primary and optional Expansion chassis are bound as RAID 6.
The K2 configuration control point PC is connected to the GigE control network. The
K2 System Configuration application runs on this PC for configuring the SAN.
Refer to Chapter 10, Description of K2 SAN Devices for more information. Also refer
to “Design considerations for Ethernet switches” on page 465 .