Grass Valley K2 Summit Storage Area Network v.7.1 - Manual (Page 364)

26 October 2009 K2 Storage Area Network Installation and Service Manual 364
Failover behaviors
Failover behaviors
If a fault occurs and one of the failover mechanisms is triggered, an online redundant
iSCSI K2 SAN behaves as explained in the following sections.
The diagrams that follow are representative of a generic redundant K2 SAN. Some
details, such as the number of media connections, might not be the same as your K2
SAN. These diagrams illustrate the media (iSCSI) and control paths as they interact
with the redundant K2 Media Servers in their role of media file system/metadata
server and iSCSI bridge. Interactions of FTP traffic and/or paths involving K2 Media
Servers with other roles are not illustrated.
Pre-failover behavior
The system operates initially with both media and control traffic on GigE switch “A”
and K2 Media Server “A”. Media (iSCSI) traffic is using media network “A”. The
iSCSI adapters (TOEs) on the “A” K2 Media Server provide access to the Fibre
Channel connected RAID storage. K2 Media Server “A” is the media file system/
metadata server.
K2 RAID
K2 Media
Servers
K2 clients
Gigabit
Ethernet
switches
A
A B
B
Fibre Channel
connections
Control
Media
Control
Media
Control
FTP
Media
Media
! K2 S AT A S T O R A G E
!
! K2 S D I M E D I A C L I EN T
!
K2 S D I M E D I A C L I EN T
!
K2 S D I M E D I A C L I EN T
K2 M E D I A S E R V E R
Control
FTP
Media
Media
K2 M E D I A S E R V E R
ISLs